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HOME > Restor Dent Endod > Volume 47(2); 2022 > Article
Research Article Morphotypes of the apical constriction of maxillary molars: a micro-computed tomographic evaluation
Jeffrey Wen-Wei Chang1orcid, Kuzhanchinathan Manigandan2orcid, Lakshman Samaranayake1orcid, Chellapandian NandhaKumar3orcid, Pazhamalai AdhityaVasun4orcid, Johny Diji4orcid, Angambakkam Rajasekharan PradeepKumar5orcid
Restor Dent Endod 2022;47(2):e19.
DOI: https://doi.org/10.5395/rde.2022.47.e19
Published online: March 24, 2022

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Correspondence to Angambakkam Rajasekaran PradeepKumar, BDS, MDS, FDSRCSEd, PhD. Professor and Head, Department of Conservative Dentistry and Endodontics, Thai Moogambigai Dental College and Hospital, Dr. MGR Educational and Research Institute (Deemed to be University), Chennai, TN 600095, India. arpradeependo@gmail.com
• Received: June 11, 2021   • Revised: August 10, 2021   • Accepted: August 21, 2021

Copyright © 2022. The Korean Academy of Conservative Dentistry

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Objectives
    The aim of this study was to evaluate and compare the apical constriction (AC) and apical canal morphology of maxillary first and second molars, using micro-computed tomography (micro-CT).
  • Materials and Methods
    The anatomical features of 313 root canals from 41 maxillary first molars and 57 maxillary second molars of patients with known age and sex were evaluated using micro-CT, with a resolution of 26.7 µm. The factors evaluated were the presence or absence of AC, the morphotypes, bucco-lingual dimension, mesio-distal dimension, and the profile (shape) of AC and the apical root canal. The apical root canal dimensions, location of the apical foramen (AF), AC to AF distance, and presence of accessory canals in the apical 5 mm were also assessed. Descriptive and analytical statistics were used for data evaluation.
  • Results
    AC was present in all 313 root canals. Patients’ age and sex did not significantly impact either AC or the apical canal dimensions. The most common AC morphotype detected was the traditional (single) constriction (52%), followed by the parallel (29%) morphotype. The mean AC dimensions in maxillary first molars were not significantly different from those in maxillary second molars. Sixty percent of AF were located within 0.5 mm from the anatomic apex.
  • Conclusions
    The most common morphotype of AC detected was the traditional constriction. Neither patients’ age nor sex had a significant impact on the dimensions of the AC or the apical root canal. The majority of AF (60%) were located within 0.5 mm from the anatomic apex.
  • Keywords: Apical constriction; Canal dimension; Maxillary molars; Micro-computed tomography
Apical constriction (AC) is defined as the apical part of a root canal that has the narrowest diameter, and it is usually located 0.5 to 1 mm coronal to the apical foramen (AF) [1]. Earlier studies evaluating AC morphology were performed using destructive methods such as sectioning and grinding of teeth [2,3,4], while more recent studies [5,6,7] have used non-invasive micro-computed tomography (micro-CT) imaging as a more sensitive and accurate technique.
Furthermore, it has been reported that AC may not be present in all root canals [8], and a relatively recent study with micro-CT imaging has reported that AC was present in only 35% of the root canals evaluated [5]. Conversely, other micro-CT studies have noted the presence of AC in all samples evaluated [6,7]. Moreover, narrowing of root canals [4] and AC with increasing age has been reported [6]. Clinically, it is important to evaluate the presence and size of AC in different age groups, which would help clinicians to choose the initial apical binding file for adequate root canal preparation.
The maxillary first molar is known to be one of the most complex teeth in the dental arch in terms of its root canal morphology [9]. Apical root canal complexities such as apical ramifications, apical constriction morphotypes, the AC to AF distance, and the position of the AF and accessory canals can jeopardize successful endodontic outcomes [5,6,10]. Previous micro-CT studies [5,9,11] have evaluated maxillary molar root canal anatomy without providing the demographic data (age and sex) of the cohort, except ElAyouti et al. [6], who evaluated the root canal anatomy of teeth from individuals with a known age, but did not compare the first and second maxillary molars. To the best of our knowledge, no published studies in the English-language literature have evaluated the apical root canal anatomy of maxillary first and second molars from patients with known age and sex, using micro-CT imaging.
Therefore, this ex vivo study was undertaken to evaluate and compare the presence or absence, morphotype, dimensions, and profile (shape) of AC along with the apical root canal dimensions, AF position, AC-AF distance, and the presence of accessory canals in the maxillary first and second molars of patients with known age and sex using micro-CT. The null hypothesis tested was that there would be no difference in the anatomic parameters between maxillary first and second molars.
Specimen selection
The institutional ethical review board of the Dr. M.G.R Educational and Research Institute approved the study protocol. Patients who had opted for tooth extraction as part of their treatment plan (for reasons unrelated to this study) were recruited from the University Dental Hospital and 5 collaborating private dental clinics located in South India. Informed consent was obtained prior to tooth extraction and the patient/tooth-related data, including the age, sex, tooth type, and radiographs obtained, were recorded.
A total of 204 extracted maxillary molars were obtained for initial screening. Teeth with incomplete root formation, resorbed roots, root caries, or root fractures; endodontically treated teeth; and third molars were excluded [6]. Samples from patients aged below 20 and above 75 years were also excluded. Finally, 98 maxillary molars comprising 41 first molars and 57 second molars were included in the study.
Demographics of the patients whose teeth were included
The collected teeth were divided into 2 patient age groups (20–40 years: 30 molars [16 first molars and 14 second molars]; 41–75 years: 68 molars [25 first molars and 43 second molars]) and according to sex (males: 43 molars [25 first molars and 18 second molars]; females: 55 molars [16 first molars and 39 second molars]).
Micro-CT imaging
Teeth were scanned using a micro-CT system (Sky Scan 1172; Bruker micro-CT, Kontich, Belgium) at 80 kV and 100 µA with an isotropic resolution of 26.7 µm with 360° rotation around the vertical axis, a rotation step of 1°, a camera exposure time of 1,159 ms, and a frame average of 2. The X-rays were then filtered with a 1-mm-thick aluminum and copper filter. Images were reconstructed with Nrecon (v.1.6.10.4) software (Bruker micro-CT) using 40% beam hardening correction and a ring artifact correction of 10, resulting in the acquisition of 37 cross-sections per millimeter [12]. Teeth were placed in a plastic tube, oriented upright, and individually scanned using micro-CT.
Micro-CT analysis
An analysis of serial cross-sections [13] of the apical 5 mm of all roots, perpendicular to the canal axis, was performed using CTAn (v.1.18.4.0) and DataViewer (v.1.5.1.2) software (Bruker micro-CT). All parameters were evaluated by 2 previously calibrated operators. In case of discrepancies, the images were examined together until a consensus was reached.
Apical constriction
The apical 3 mm of the root canal was evaluated for the presence of AC [5]. AC was identified as the canal cross-section with the smallest area extending for a distance of 0.1 mm or more, or the location of an abrupt change in canal dimensions [6].
The root canal morphotypes were categorized as defined by ElAyouti et al. [6]. Thus, a traditional (single) constriction was defined when the canal diverged apically and coronally from the smallest cross-sections. The parallel morphotype was defined as the narrowest part (constriction) of the root canal that extended up to the AF, creating a parallel zone, while in the tapered form, the root canal narrowed steadily towards the apex and the narrowest part almost coincided (within 0.1 mm) with the AF (Figure 1) [6]. The delta morphotype was defined as complex apical ramifications without a discernible main canal (Figure 2) [14]. The location at which the main canal diverged was construed as the AC.
Figure 1

Apical constriction morphotypes: (A) traditional constriction, (B) parallel constriction, (C) delta constriction, and (D) tapering constriction.

rde-47-e19-g001.jpg
Figure 2

Complex multiple apical ramifications in a delta constriction.

rde-47-e19-g002.jpg
AC and apical root canal dimensions and profile
The bucco-lingual dimension (BLD), mesio-distal dimension (MDD), and profile (oval/round) of the AC and apical root canal (1, 2, and 3 mm from the AC) were also assessed (Figure 3).
Figure 3

Apical canal dimensions: the mesio-buccal and disto-buccal canals are wider in the bucco-palatal dimension, and the palatal canal is wider in the mesio-distal dimension.

rde-47-e19-g003.jpg
Distance from the AC to the AF and position of the AF
The AC to AF distance and the position of the AF was evaluated (Figure 4). The distance between the AC and the AF in the parallel form was measured from the coronal extent of the AC to the AF, and in the delta type from the AC to the AF associated with the largest ramification. An AF located up to 0.5 mm from the anatomic apex was considered as being at the apex, while an AF more than 0.5 mm distant from the anatomic apex was classified as a deviated AF [11].
Figure 4

Lateral view of the anatomic apex showing apical foramen deviation.

rde-47-e19-g004.jpg
Accessory canals
Accessory canals were defined as additional branches of the main canal in the apical 5 mm of the root canal (Figure 5) [1].
Figure 5

Presence of accessory canals in a first mesio-buccal canal.

rde-47-e19-g005.jpg
Statistical analysis
Statistical analysis was performed using SPSS version 17.0 (SPSS Inc., Chicago, IL, USA) software. Inter-examiner agreement for all parameters was evaluated using kappa statistics. The frequency distributions of all parameters were obtained. The independent-sample Student t-test or Mann-Whitney test was used to compare continuous variables between maxillary first and second molars. One-way analysis of variance with the post hoc Tukey honest significant difference test was used to compare AC types within individual canal categories. The chi-square test was used for comparisons between 2 attributes. A 2-sided p value < 0.05 was considered to indicate statistical significance.
The kappa score was 0.9, indicating good inter-examiner reliability.
Number of root canals
In total, 383 root canals from the first and second maxillary molars were evaluated in this study (161 canals from 41 maxillary first molars: 41 first mesio-buccal [MB1], 38 second mesio-buccal [MB2], 41 disto-buccal [DB] and 41 palatal canals) and 222 canals from 57 maxillary second molars (57 MB1, 51 MB2, 57 DB, and 57 palatal canals). Eighty-nine MB2 canals were identified in 98 MB roots (91%). In 70 MB roots, the MB2 canal joined the MB1 canal, and only 19 MB roots (13 of 41 first molars and 6 of 57 second molars) had MB2 canals with a separate exit (AC and AF). Therefore, 313 (136 first molars and 177 second molars) apical root canals were analyzed. Since only 19 MB2 canals (21%) had a separate exit, the AC and apical root canal measurements in MB2 canals were not analyzed statistically.
Apical constriction
All 313 apical root canals evaluated in this study demonstrated the presence of AC. In both maxillary first and second molars, the major form of AC identified was the traditional (single) constriction (Table 1).
Table 1

Morphotypes of apical constriction (AC) in the maxillary first and second molars

Types of AC Maxillary first molars Maxillary second molars
MB1 DB P MB2 MB1 DB P MB2
Traditional 44% 59% 49% 84% 35% 56% 56% 83%
Parallel 20% 29% 34% 8% 39% 27% 34% 17%
Delta 34% 7% 15% - 23% 12% 7% -
Tapering 2% 5% 2% 8% 3% 5% 3% -
MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.
AC/apical root canal dimensions and profile
There were no significant differences in the AC and apical canal dimensions between the maxillary first and second molars, and the profile of AC (69%) and the apical root canals (86%) were mainly oval in both maxillary molars (Tables 2 and 3). The root canal BLD and MDD at 1, 2, and 3 mm from the AC demonstrated increased dimensions, mainly for BLD in the MB1, MB2, and DB canals and for MDD in the palatal canals (Figure 3) in both the first and the second maxillary molars (Tables 2 and 3). Neither age nor sex (Tables 4 and 5) had a significant impact on AC dimensions or the apical root canal dimensions of the maxillary first or second molars. The mean size of AC in all root canals based on the AC morphotypes of both the first and the second molars are presented in Table 6.
Table 2

Dimensions (mm) of apical constriction (AC) and apical root canal at 1, 2, and 3 mm from the AC as percentages

Canal AC–BLD AC–MDD BLD-1 mm MDD-1 mm BLD-2 mm MDD-2 mm BLD-3 mm MDD-3 mm
Maxillary first molars
MB1 (n = 41) 0.24 ± 0.10 (0.09–0.50) 0.21 ± 0.08 (0.09–0.43) 0.41 ± 0.17 (0.13–0.92) 0.23 ± 0.08 (0.10–0.42) 0.45 ± 0.26 (0.16–1.10) 0.24 ± 0.07 (0.10–0.21) 0.58 ± 0.40 (0.18–1.80) 0.27 ± 0.09 (0.13–0.52)
DB (n = 41) 0.19 ± 0.08 (0.06–0.43) 0.19 ± 0.08 (0.06–0.36) 0.29 ± 0.12 (0.09–0.53) 0.22 ± 0.08 (0.10–0.49) 0.33 ± 0.12 (0.06–0.61) 0.23 ± 0.08 (0.12–0.48) 0.38 ± 0.18 (0.09–0.79) 0.27 ± 0.10 (0.09–0.52)
P (n = 41) 0.26 ± 0.09 (0.10–0.44) 0.29 ± 0.11 (0.10–0.55) 0.37 ± 0.11 (0.14–0.64) 0.43 ± 0.13 (0.13–0.77) 0.39 ± 0.10 (0.15–0.61) 0.49 ± 0.17 (0.19–1.1) 0.46 ± 0.13 (0.24–0.80) 0.56 ± 0.20 (0.24–1.2)
MB2 (n = 13) 0.18 ± 0.05 (0.10–0.27) 0.19 ± 0.07 (0.14–0.30) 0.27 ± 0.06 (0.21–0.36) 0.18 ± 0.03 (0.15–0.25) 0.42 ± 0.16 (0.30–0.64) 0.17 ± 0.06 (0.16–0.28) 0.44 ± 0.13 (0.30–0.61) 0.18 ± 0.06 (0.15–0.28)
Maxillary second molars
MB1 (n = 57) 0.19 ± 0.07 (0.08–0.46) 0.20 ± 0.08 (0.08–0.51) 0.37 ± 0.26 (0.10–1.40) 0.26 ± 0.16 (0.10–1.20) 0.55 ± 0.42 (0.16–1.90) 0.25 ± 0.13 (0.10–0.92) 0.63 ± 0.47 (0.15–2.50) 0.28 ± 0.15 (0.10–1.10)
DB (n = 57) 0.18 ± 0.06 (0.08–0.37) 0.17 ± 0.07 (0.06–0.36) 0.24 ± 0.10 (0.10–0.80) 0.20 ± 0.06 (0.10–0.37) 0.28 ± 0.11 (0.10–0.66) 0.24 ± 0.08 (0.11–0.42) 0.33 ± 0.15 (0.10–0.82) 0.28 ± 0.11 (0.13–0.61)
P (n = 57) 0.23 ± 0.07 (0.10–0.40) 0.24 ± 0.07 (0.10–0.40) 0.33 ± 0.09 (0.15–0.58) 0.36 ± 0.15 (0.14–1.20) 0.37 ± 0.11 (0.18–0.68) 0.45 ± 0.19 (0.18–1.5) 0.45 ± 0.13 (0.22–0.92) 0.53 ± 0.23 (0.21–1.6)
MB2 (n = 6) 0.15 ± 0.04 (0.08–0.24) 0.12 ± 0.02 (0.10–0.16) 0.31 ± 0.15 (0.15–0.48) 0.15 ± 0.04 (0.14–0.25) 0.32 ± 0.11 (0.18–0.48) 0.17 ± 0.05 (0.15–0.27) 0.33 ± 0.06 (0.21–0.42) 0.18 ± 0.08 (0.16–0.32)
The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.
BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.
Table 3

Profile (shape) of apical constriction (AC) and apical root canal at 1, 2, and 3 mm from the AC

Canal Maxillary first molars Maxillary second molars
AC 1 mm from AC 2 mm from AC 3 mm from AC AC 1 mm from AC 2 mm from AC 3 mm from AC
O R O R O R O R O R O R O R O R
MB1 78 22 87 13 90 10 95 5 77 23 93 7 96 4 94 6
DB 56 44 85 15 95 5 82 18 63 37 75 25 91 9 84 16
P 78 22 71 29 87 13 78 22 67 33 73 27 82 18 84 16
MB2 62 38 92 8 100 - 100 - 67 33 100 - 100 - 100 -
O, oval; R, round; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.
Table 4

Dimensions (mm) of apical constriction (AC) and the root canal at 1, 2 and 3 mm from the AC based on age groups

Variables 20–40 years 41–75 years
MB1 DB P MB2 MB1 DB P MB2
Maxillary first molars (n = 16) (n = 16) (n = 16) (n = 3) (n = 25) (n = 25) (n = 25) (n = 10)
AC–BLD 0.24 ± 0.10 (0.10–0.50) 0.20 ± 0.09 (0.06–0.43) 0.27 ± 0.07 (0.18–0.44) 0.12 ± 0.04 (0.08–0.17) 0.24 ± 0.08 (0.15–0.46) 0.19 ± 0.07 (0.08–0.37) 0.25 ± 0.10 (0.10–0.42) 0.15 ± 0.04 (0.08–0.24)
AC–MDD 0.20 ± 0.08 (0.09–0.42) 0.19 ± 0.08 (0.06–0.34) 0.29 ± 0.09 (0.15–0.52) 0.14 ± 0.02 (0.12–0.16) 0.21 ± 0.09 (0.15–0.49) 0.19 ± 0.08 (0.06–0.36) 0.29 ± 0.12 (0.10–0.55) 0.11 ± 0.02 (0.08–0.14)
BLD-1 mm 0.36 ± 0.18 (0.21–0.92) 0.29 ± 0.13 (0.09–0.53) 0.37 ± 0.13 (0.14–0.55) 0.32 ± 0.14 (0.20–0.48) 0.44 ± 0.16 (0.13–0.76) 0.29 ± 0.10 (0.09–0.49) 0.37 ± 0.10 (0.18–0.64) 0.31 ± 0.16 (0.15–0.72)
MDD-1 mm 0.23 ± 0.09 (0.13–0.42) 0.21 ± 0.08 (0.12–0.36) 0.40 ± 0.15 (0.13–0.58) 0.16 ± 0.08 (0.08–0.25) 0.24 ± 0.08 (0.10–0.41) 0.23 ± 0.08 (0.10–0.49) 0.45 ± 0.12 (0.22–0.77) 0.15 ± 0.03 (0.08–0.15)
BLD-2 mm 0.45 ± 0.16 (0.21–0.91) 0.34 ± 0.14 (0.06–0.61) 0.39 ± 0.12 (0.16–0.52) 0.39 ± 0.09 (0.30–0.48) 0.49 ± 0.30 (0.16–1.10) 0.33 ± 0.12 (0.09–0.61) 0.40 ± 0.10 (0.15–0.61) 0.30 ± 0.11 (0.18–0.48)
MDD-2 mm 0.25 ± 0.07 (0.15–0.42) 0.22 ± 0.07 (0.12–0.37) 0.46 ± 0.15 (0.24–0.67) 0.20 ± 0.09 (0.10–0.27) 0.23 ± 0.07 (0.10–0.43) 0.24 ± 0.08 (0.15–0.48) 0.50 ± 0.19 (0.19–1.10) 0.16 ± 0.04 (0.10–0.24)
BLD-3 mm 0.52 ± 0.19 (0.26–0.98) 0.39 ± 0.15 (0.09–0.67) 0.49 ± 0.13 (0.27–0.73) 0.36 ± 0.03 (0.34–0.40) 0.57 ± 0.48 (0.18–1.80) 0.38 ± 0.19 (0.12–0.79) 0.45 ± 0.13 (0.24–0.80) 0.32 ± 0.07 (0.21–0.42)
MDD-3 mm 0.26 ± 0.10 (0.15–0.52) 0.27 ± 0.10 (0.12–0.45) 0.58 ± 0.15 (0.34–0.85) 0.24 ± 0.12 (0.10–0.32) 0.28 ± 0.09 (0.13–0.44) 0.26 ± 0.10 (0.09–0.52) 0.54 ± 0.23 (0.24–1.20) 0.16 ± 0.06 (0.10–0.32)
Maxillary second molars (n = 14) (n = 14) (n = 14) (n = 4) (n = 43) (n = 43) (n = 43) (n = 2)
AC–BLD 0.21 ± 0.06 (0.13–0.42) 0.17 ± 0.07 (0.08–0.34) 0.22 ± 0.06 (0.12–0.32) 0.16 ± 0.04 (0.10–0.19) 0.18 ± 0.07 (0.08–0.46) 0.18 ± 0.06 (0.08–0.37) 0.22 ± 0.07 (0.10–0.40) 0.24
AC–MDD 0.22 ± 0.08 (0.10–0.45) 0.16 ± 0.06 (0.08–0.29) 0.24 ± 0.07 (0.12–0.37) 0.19 ± 0.07 (0.15–0.30) 0.19 ± 0.08 (0.08–0.51) 0.18 ± 0.07 (0.06–0.36) 0.24 ± 0.07 (0.10–0.40) 0.21
BLD-1 mm 0.36 ± 0.18 (0.10–0.90) 0.23 ± 0.07 (0.10–0.37) 0.29 ± 0.08 (0.15–0.42) 0.29 ± 0.07 (0.21–0.36) 0.37 ± 0.29 (0.13–1.40) 0.25 ± 0.11 (0.10–0.80) 0.34 ± 0.10 (0.18–0.58) 0.27
MDD-1 mm 0.26 ± 0.08 (0.13–0.48) 0.18 ± 0.05 (0.10–0.28) 0.34 ± 0.09 (0.14–0.50) 0.17 ± 0.01 (0.15–0.18) 0.26 ± 0.18 (0.10–1.20) 0.21 ± 0.06 (0.10–0.37) 0.36 ± 0.16 (0.22–0.66) 0.21
BLD-2 mm 0.61 ± 0.46 (0.16–1.60) 0.30 ± 0.14 (0.12–0.66) 0.32 ± 0.10 (0.18–0.48) 0.40 ± 0.16 (0.28–0.64) 0.53 ± 0.41 (0.16–1.90) 0.28 ± 0.10 (0.10–0.51) 0.38 ± 0.11 (0.21–0.68) 0.47
MDD-2 mm 0.27 ± 0.10 (0.13–0.46) 0.22 ± 0.09 (0.12–0.42) 0.43 ± 0.14 (0.18–0.64) 0.15 ± 0.04 (0.08–0.18) 0.24 ± 0.15 (0.10–0.92) 0.25 ± 0.07 (0.11–0.42) 0.45 ± 0.21 (0.21–1.50) 0.23
BLD-3 mm 0.67 ± 0.43 (0.21–1.60) 0.30 ± 0.14 (0.13–0.65) 0.41 ± 0.11 (0.22–0.66) 0.42 ± 0.13 (0.30–0.61) 0.67 ± 0.49 (0.15–2.50) 0.34 ± 0.16 (0.10–0.82) 0.46 ± 0.13 (0.24–0.92) 0.48
MDD-3 mm 0.31 ± 0.10 (0.10–0.46) 0.28 ± 0.14 (0.13–0.61) 0.49 ± 0.16 (0.24–0.88) 0.16 ± 0.04 (0.09–0.19) 0.27 ± 0.16 (0.10–1.10) 0.28 ± 0.10 (0.13–0.58) 0.54 ± 0.25 (0.21–1.60) 0.22
The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.
AC, apical constriction; BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.
Table 5

Dimensions (mm) of apical constriction (AC) and root canal at 1, 2 and 3 mm from the AC based on sex

Variables Male Female
MB1 DB P MB2 MB1 DB P MB2
Maxillary first molars (n = 25) (n = 25) (n = 25) (n = 2) (n = 16) (n = 16) (n = 16) (n = 11)
AC–BLD 0.23 ± 0.08 (0.09–0.42) 0.20 ± 0.08 (0.06–0.43) 0.26 ± 0.09 (0.10–0.44) 0.14 0.26 ± 0.13 (0.10–0.50) 0.18 ± 0.08 (0.08–0.34) 0.26 ± 0.09 (0.10–0.42) 0.14 ± 0.05 (0.08–0.24)
AC–MDD 0.20 ± 0.07 (0.10–0.42) 0.20 ± 0.07 (0.06–0.36) 0.28 ± 0.12 (0.10–0.52) 0.13 0.22 ± 0.10 (0.09–0.43) 0.19 ± 0.09 (0.06–0.34) 0.30 ± 0.11 (0.17–0.55) 0.11 ± 0.02 (0.08–0.16)
BLD-1 mm 0.41 ± 0.19 (0.21–0.92) 0.29 ± 0.11 (0.09–0.49) 0.38 ± 0.11 (0.14–0.64) 0.31 0.40 ± 0.14 (0.13–0.67) 0.29 ± 0.12 (0.09–0.53) 0.36 ± 0.12 (0.18–0.55) 0.31 ± 0.15 (0.20–0.72)
MDD-1 mm 0.23 ± 0.07 (0.13–0.42) 0.23 ± 0.09 (0.12–0.49) 0.42 ± 0.12 (0.13–0.64) 0.11 0.25 ± 0.10 (0.10–0.41) 0.21 ± 0.08 (0.10–0.36) 0.45 ± 0.15 (0.22–0.77) 0.15 ± 0.04 (0.08–0.25)
BLD-2 mm 0.48 ± 0.27 (0.24–1.10) 0.33 ± 0.14 (0.06–0.61) 0.38 ± 0.10 (0.16–0.61) 0.30 0.41 ± 0.25 (0.16–1.10) 0.33 ± 0.11 (0.09–0.52) 0.41 ± 0.11 (0.15–0.61) 0.32 ± 0.10 (0.18–0.48)
MDD-2 mm 0.24 ± 0.07 (0.13–0.43) 0.24 ± 0.08 (0.12–0.48) 0.47 ± 0.18 (0.24–1.10) 0.13 0.25 ± 0.07 (0.10–0.21) 0.23 ± 0.07 (0.15–0.37) 0.51 ± 0.16 (0.19–0.78) 0.17 ± 0.05 (0.10–0.27)
BLD-3 mm 0.60 ± 0.45 (0.21–1.80) 0.38 ± 0.19 (0.09–0.79) 0.45 ± 0.12 (0.24–0.73) 0.28 0.48 ± 0.29 (0.18–0.43) 0.38 ± 0.16 (0.12–0.70) 0.48 ± 0.15 (0.24–0.80) 0.34 ± 0.05 (0.24–0.42)
MDD-3 mm 0.27 ± 0.10 (0.15–0.52) 0.27 ± 0.10 (0.12–0.52) 0.55 ± 0.22 (0.24–1.20) 0.13 0.29 ± 0.09 (0.13–0.40) 0.26 ± 0.10 (0.09–0.45) 0.57 ± 0.17 (0.34–1.04) 0.18 ± 0.09 (0.10–0.32)
Maxillary second molars (n = 18) (n = 18) (n = 18) (n = 5) (n = 39) (n = 39) (n = 39) (n = 1)
AC–BLD 0.18 ± 0.07 (0.08–0.42) 0.17 ± 0.06 (0.08–0.29) 0.24 ± 0.07 (0.13–0.40) 0.19 ± 0.05 (0.10–0.27) 0.19 ± 0.07 (0.10–0.46) 0.18 ± 0.06 (0.08–0.37) 0.23 ± 0.07 (0.10–0.39) 0.15
AC–MDD 0.20 ± 0.08 (0.11–0.45) 0.17 ± 0.07 (0.06–0.28) 0.25 ± 0.08 (0.10–0.40) 0.20 ± 0.07 (0.15–0.30) 0.20 ± 0.08 (0.08–0.51) 0.17 ± 0.07 (0.08–0.36) 0.23 ± 0.06 (0.10–0.37) 0.16
BLD-1 mm 0.37 ± 0.34 (0.13–1.40) 0.24 ± 0.15 (0.13–0.80) 0.30 ± 0.10 (0.18–0.56) 0.26 ± 0.06 (0.21–0.33) 0.36 ± 0.21 (0.10–1.10) 0.24 ± 0.08 (0.10–0.40) 0.34 ± 0.09 (0.10–0.58) 0.36
MDD-1 mm 0.22 ± 0.10 (0.10–0.48) 0.20 ± 0.05 (0.13–0.30) 0.31 ± 0.07 (0.22–0.50) 0.18 ± 0.03 (0.15–0.25) 0.28 ± 0.18 (0.10–1.20) 0.20 ± 0.06 (0.10–0.37) 0.38 ± 0.17 (0.14–1.20) 0.18
BLD-2 mm 0.59 ± 0.49 (0.18–1.90) 0.24 ± 0.10 (0.13–0.45) 0.35 ± 0.11 (0.21–0.61) 0.37 ± 0.16 (0.30–0.61) 0.53 ± 0.39 (0.16–1.90) 0.30 ± 0.11 (0.10–0.66) 0.38 ± 0.11 (0.18–0.68) 0.64
MDD-2 mm 0.21 ± 0.08 (0.1–0.39) 0.22 ± 0.07 (0.11–0.42) 0.39 ± 0.11 (0.21–0.64) 0.19 ± 0.06 (0.16–0.28) 0.27 ± 0.15 (0.10–0.92) 0.25 ± 0.08 (0.12–0.42) 0.47 ± 0.21 (0.18–1.50) 0.08
BLD-3 mm 0.60 ± 0.58 (0.15–2.50) 0.26 ± 0.15 (0.10–0.73) 0.43 ± 0.15 (0.24–0.92) 0.40 ± 0.13 (0.30–0.61) 0.61 ± 0.41 (0.18–2.20) 0.36 ± 0.15 (0.10–0.82) 0.46 ± 0.12 (0.22–0.70) 0.61
MDD-3 mm 0.24 ± 0.10 (0.10–0.46) 0.24 ± 0.12 (0.13–0.58) 0.47 ± 0.19 (0.21–1.10) 0.19 ± 0.06 (0.16–0.28) 0.31 ± 0.17 (0.10–1.10) 0.30 ± 0.11 (0.13–0.61) 0.56 ± 0.14 (0.24–1.60) 0.09
The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.
AC, apical constriction; BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.
Table 6

Dimensions (mm) of apical constriction (AC) based on AC types

Canal Traditional Parallel Delta Tapering
BLD MDD BLD MDD BLD MDD BLD MDD
Maxillary first molars
MB1 0.21 ± 0.08 (0.09–0.39) 0.18 ± 0.06 (0.09–0.32) 0.33 ± 0.11 (0.21–0.46) 0.29* ± 0.12 (0.09–0.14) 0.23 ± 0.10 (0.10–0.50) 0.21 ± 0.05 (0.10–0.33) 0.24 0.21
DB 0.16 ± 0.06 (0.06–0.33) 0.17 ± 0.07 (0.06–0.34) 0.23 ± 0.07 (0.11–0.37) 0.24 ± 0.06 (0.13–0.36) 0.25 ± 0.17 (0.09–0.43) 0.18 ± 0.10 (0.09–0.30) 0.27 0.30
P 0.26 ± 0.09 (0.10–0.40) 0.30 ± 0.11 (0.14–0.55) 0.26 ± 0.10 (0.10–0.42) 0.27 ± 0.09 (0.10–0.41) 0.26 ± 0.10 (0.17–0.44) 0.28 ± 0.17 (0.14–0.52) 0.30 0.30
MB2 0.15 ± 0.05 (0.08–0.24) 0.11 ± 0.02 (0.08–0.16) 0.10 0.12 - - 0.13 0.13
Maxillary second molars
MB1 0.18 ± 0.07 (0.10–0.46) 0.19 ± 0.07 (0.08–0.42) 0.22 ± 0.08 (0.10–0.42) 0.23 ± 0.09 (0.10–0.51) 0.15 ± 0.04 (0.08–0.26) 0.16 ± 0.04 (0.11–0.25) 0.17 0.19
DB 0.16 ± 0.07 (0.10–0.37) 0.15 ± 0.06 (0.06–0.34) 0.20 ± 0.05 (0.11–0.29) 0.20 ± 0.06 (0.13–0.36) 0.22* ± 0.05 (0.16–0.34) 0.19 ± 0.07 (0.10–0.29) 0.15 0.17
P 0.23 ± 0.06 (0.12–0.39) 0.23 ± 0.06 (0.10–0.37) 0.25 ± 0.08 (0.10–0.37) 0.26 ± 0.07 (0.10–0.40) 0.20 ± 0.07 (0.13–0.28) 0.17 ± 0.05 (0.13–0.25) 0.25 0.24
MB2 0.16 ± 0.04 (0.10–0.22) 0.18 ± 0.06 (0.15–0.30) 0.27 0.28 - - - -
The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.
BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.
*A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05). The tapering constriction did not have a standard deviation and range, as only 12 samples were available.
Distance between the AC and the AF and position of the AF
There was no significant difference in the AC-AF distance or the position of the AF between the maxillary first and second molars (Table 7). The AC-AF distance and the position of the AF based on AC type, age, and sex are presented in Tables 8 and 9, respectively.
Table 7

Apical constriction (AC) to apical foramen (AF) distance (mm), position of AF and presence of accessory canals in the maxillary first and second molars

Canal AC-AF distance (mm) Position of AF Accessory canals
Root tip Deviated AF-Apex distance (mm) Presence Absence
Maxillary first molars
MB1 0.57 ± 0.21 (0.09–1.10) 28 (68.3) 13 (31.7) 0.65 ± 0.13 (0.51–0.92) 16 (39.0) 25 (61.0)
DB 0.65 ± 0.16 (0.09–0.98) 32 (78.0) 9 (22.0) 0.61 ± 0.08 (0.51–0.72) 7 (17.1) 34 (82.9)
P 0.62 ± 0.21 (0.08–0.94) 27 (65.9) 14 (34.1) 0.70 ± 0.18 (0.51–1.20) 5 (12.2) 36 (87.8)
MB2 0.56 ± 0.25 (0.08–1.02) 9 (69.2) 4 (30.8) 0.52 ± 0.18 (0.51–0.76) 5 (38.5) 8 (61.5)
Maxillary second molars
MB1 0.64 ± 0.24 (0.08–1.13) 21 (36.8) 36 (63.2) 0.60 ± 0.09 (0.51–0.83) 21 (36.8) 36 (63.2)
DB 0.67 ± 0.20 (0.09–1) 42 (73.7) 15 (26.3) 0.58 ± 0.08 (0.51–0.78) 8 (14.0) 49 (86.0)
P 0.69 ± 0.20 (0.08–0.98) 42 (73.7) 15 (26.3) 0.70 ± 0.08 (0.51–1.20) 9 (15.8) 48 (84.2)
MB2 0.57 ± 0.18 (0.24–0.72) 2 (33.3) 4 (66.7) 0.56 ± 0.16 (0.51–0.71) 2 (33.3) 4 (66.7)
Combined maxillary first and second molars
MB1 0.61 ± 0.23 (0.08–1.13) 49 (50.0) 49 (50.0) 0.62 ± 0.11 (0.51–0.92) 37 (37.8) 61 (62.2)
DB 0.66 ± 0.18 (0.09–1) 74 (75.5) 24 (24.5) 0.59 ± 0.08 (0.51–0.78) 15 (15.3) 83 (84.7)
P 0.66 ± 0.21 (0.08–0.98) 69 (70.4) 29 (29.6) 0.70 ± 0.19 (0.51–1.20) 14 (14.3) 84 (85.7)
MB2 0.56 ± 0.22 (0.08–1.02) 11 (57.9) 8 (42.1) 0.54 ± 0.16 (0.51–0.76) 7 (36.8) 12 (63.2)
The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis. Data shown are number (%) when not otherwise specified.
MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.
Table 8

Apical constriction (AC) - apical foramen (AF) distance (mm) based on AC types, age groups and sex

Variables Maxillary first molars Maxillary second molars
MB1 DB P MB2 MB1 DB P MB2
Type of AC
Traditional 0.56 ± 0.19 (0.30–0.92) 0.62 ± 0.15 (0.24–0.92) 0.71* ± 0.21 (0.24–0.94) 0.59 ± 0.26 (0.18–1.02) 0.67 ± 0.23 (0.32–1.13) 0.62 ± 0.16 (0.35–1) 0.73* ± 0.19 (0.29–0.98) 0.56 ± 0.19 (0.24–0.72)
Parallel 0.64 ± 0.27 (0.4–1.10) 0.70 ± 0.11 (0.55–0.92) 0.55 ± 0.20 (0.23–0.86) 0.51 0.57 ± 0.25 (0.23–1.10) 0.76 ± 0.18 (0.43–1) 0.67 ± 0.19 (0.29–0.94) 0.64 (1)
Delta 0.54 ± 0.19 (0.21–0.89) 0.76 ± 0.23 (0.52–0.98) 0.52 ± 0.18 (0.42–0.61) - 0.76* ± 0.17 (0.54–1.10) 0.83* ± 0.16 (0.51–1) 0.71 ± 0.10 (0.62–0.86) -
Tapering 0.09 0.09 0.08 0.08 0.08 0.09 0.08 -
Age groups
20–40 years 0.56 ± 0.22 (0.21–0.97) 0.63 ± 0.16 (0.24–0.98) 0.62 ± 0.21 (0.23–0.94) 0.77 ± 0.25 (0.51–1.02) 0.53 ± 0.18 (0.29–0.89) 0.73 ± 0.23 (0.35–1) 0.61 ± 0.24 (0.29–0.94) 0.53 ± 0.08 (0.24–0.72)
41–75 years 0.57 ± 0.19 (0.30–1.10) 0.66 ± 0.16 (0.30–0.92) 0.62 ± 0.21 (0.24–0.94) 0.50 ± 0.22 (0.08–1) 0.68* ± 0.25 (0.15–1.13) 0.65 ± 0.19 (0.13–1) 0.72 ± 0.18 (0.19–0.98) 0.67
Sex
Male 0.57 ± 0.21 (0.21–0.97) 0.68 ± 0.14 (0.30–0.98) 0.62 ± 0.20 (0.23–0.94) 0.36 0.60 ± 0.23 (0.15–1.05) 0.66 ± 0.23 (0.13–1) 0.77* ± 0.14 (0.56–0.98) 0.57 ± 0.20 (0.24–0.72)
Female 0.56 ± 0.21 (0.30–1.10) 0.61 ± 0.17 (0.24–0.92) 0.61 ± 0.23 (0.24–0.94) 0.59 ± 0.25 (0.18–1.02) 0.66 ± 0.24 (0.29–1.13) 0.67 ± 0.19 (0.32–1) 0.65 ± 0.21 (0.19–0.94) 0.58
The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.
MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.
*A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05). The tapering constriction did not have a standard deviation and range, as only 12 samples were available.
Table 9

Position of apical foramen (AF) based on apical constriction (AC) types, age groups, and sex

Canal Maxillary first molars Maxillary second molars
Root tip Deviated AF-apex distance (mm) Root tip Deviated AF-apex distance (mm)
MB1
Type of AC
Traditional 13 (72.2) 5 (27.8) 0.71 ± 0.19 (0.51–0.92) 18 (90.0) 2 (10.0) 0.51
Parallel 6 (75.0) 2 (25.0) 0.63 - 22* (100.0) 0.59 ± 0.08 (0.51–0.76)
Delta 8 (57.1) 6 (42.9) 0.67 ± 0.07 (0.51–0.65) 1 (7.7) 12* (92.3) 0.59 ± 0.12 (0.51–0.83)
Tapering 1 (100.0) - - 2 (100.0) - -
Age group
20–40 years 10 (62.5) 6 (37.5) 0.68 ± 0.18 (0.51–0.92) 5 (35.7) 9 (64.3) 0.63 ± 0.10 (0.53–0.83)
41–75 years 18 (72.0) 7 (28.0) 0.62 ± 0.07 (0.51–0.76) 16 (37.2) 27 (62.8) 0.56 ± 0.09 (0.51–0.76)
Sex
Male 16 (64.0) 9 (36.0) 0.62 ± 0.12 (0.51–0.92) 5 (27.8) 13 (72.2) 0.58 ± 0.08 (0.51–0.72)
Female 12 (75.0) 4 (25.0) 0.72 ± 0.14 (0.60–0.92) 16 (41.0) 23 (59.0) 0.59 ± 0.11 (0.51–0.83)
DB
Type of AC
Traditional 20 (83.3) 4 (16.7) 0.61 ± 0.11 (0.51–0.72) 21 (65.6) 11 (34.4) 0.61 ± 0.08 (0.51–0.78)
Parallel 9 (75.0) 3 (25.0) 0.67 ± 0.10 (0.51–0.72) 13 (86.7) 2 (13.3) 0.51
Delta 1 (33.3) 2 (66.7) 0.60 5 (71.4) 2 (28.6) 0.53
Tapering 2 (100.0) - - 3 (100.0) - -
Age group
20–40 years 13 (81.3) 3 (18.8) 0.62 ± 0.10 (0.51–0.71) 8 (57.1) 6 (42.9) 0.57 ± 0.06 (0.51–0.64)
41–75 years 19 (76.0) 6 (24.0) 0.61 ± 0.09 (0.51–0.72) 34 (79.1) 9 (20.9) 0.59 ± 0.10 (0.51–0.78)
Sex
Male 20 (80.0) 5 (20.0) 0.66 ± 0.08 (0.52–0.72) 10 (55.6) 8* (44.4) 0.56 ± 0.11 (0.51–0.78)
Female 12 (75.0) 4 (25.0) 0.55 ± 0.06 (0.51–0.64) 32 (82.1) 7 (17.9) 0.61 ± 0.02 (0.57–0.64)
P
Type of AC
Traditional 15 (75.0) 5 (25.0) 0.73 ± 0.16 (0.57–0.96) 27 (84.4) 5 (15.6) 0.71 ± 0.28 (0.51–1.20)
Parallel 7 (50.0) 7 (50.0) 0.63 ± 0.07 (0.55–0.73) 11 (57.9) 8 (42.1) 0.72 ± 0.16 (0.51–0.96)
Delta 4 (66.7) 2 (33.3) 0.85 2 (50.0) 2 (50.0) 0.60
Tapering 1 (100.0) - - 2 (100.0) - -
Age group
20–40 years 8 (50.0) 8* (50.0) 0.72* ± 0.21 (0.55–1.20) 8 (57.1) 6 (42.9) 0.64* ± 0.09 (0.51–0.74)
41–75 years 19 (76.0) 6 (24.0) 0.66 ± 0.16 (0.51–0.96) 34 (79.1) 9 (20.9) 0.75 ± 0.24 (0.51–1.20)
Sex
Male 19 (76.0) 6 (24.0) 0.75 ± 0.27 (0.51–1.20) 13 (72.2) 5 (27.8) 0.82 ± 0.26 (0.51–1.20)
Female 8 (50.0) 8 (50.0) 0.66 ± 0.10 (0.55–0.85) 29 (74.4) 10 (25.6) 0.65 ± 0.14 (0.51–0.90)
MB2
Type of AC
Traditional 8 (72.7) 3 (27.3) 0.53 ± 0.34 (0.51–0.57) 2 (40.0) 3 (60.0) 0.55 ± 0.19 (0.51–0.71)
Parallel - 1 (100.0) 0.76 - 1 (100.0) 0.58
Delta - - - - - -
Tapering 1 (100.0) - - - - -
Age group
20–40 years 2 (66.7) 1 (33.3) 0.76 2 (50.0) 2 (50.0) 0.61
41–75 years 7 (70.0) 3 (30.5) 0.53 ± 0.34 (0.51–0.57) - 2 (100.0) 0.64
Sex
Male 1 (50.0) 1 (50.0) 0.57 1 (20.0) 4 (80.0) 0.60 ± 0.08 (0.51–0.71)
Female 8 (72.7) 3 (27.3) 0.59 ± 0.14 (0.51–0.76) 1 (100.0) - -
The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis. Data shown are number (%) when not otherwise specified.
MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.
*A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05).
Accessory canals
There were no significant differences in the prevalence of accessory canals between the maxillary first and second molars (Table 7). The presence of accessory canals based on AC types, age, and sex are presented in Table 10.
Table 10

Presence of accessory canals based on apical constriction (AC) types, age groups and sex

Canal Maxillary first molars Maxillary second molars
n (presence %) n (presence %)
MB1
Type of AC
Traditional 10 (56) 7 (35)
Parallel 6* (75) 13* (59)
Delta - -
Tapering - 1 (50)
Age group
20–40 years 4 (25) 10* (71)
41–75 years 12 (48) 11 (26)
Sex
Male 11 (44) 6 (33)
Female 5 (31) 15 (38)
DB
Type of AC
Traditional 3 (13) 4 (13)
Parallel 3 (25) 3 (20)
Delta - -
Tapering 1 (50) 1 (33)
Age group
20–40 years 1 (6) 1 (7)
41–75 years 6 (24) 7 (16)
Sex
Male 3 (12) -
Female 4 (25) 8* (20)
P
Type of AC
Traditional 4 (20) 5* (16)
Parallel 1 (7) 2 (10)
Delta - -
Tapering - 2 (100)
Age group
20–40 years 2 (13) 3 (21)
41–75 years 3 (12) 6 (14)
Sex
Male 5 (20) -
Female - 9* (23)
MB2
Type of AC
Traditional 4 (36) 2 (40)
Parallel 1 (100) -
Delta - -
Tapering - -
Age group
20–40 years 3 (100) 2 (50)
41–75 years 2 (20) -
Sex
Male 1 (50) 1 (20)
Female 4 (36) 1 (100)
MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.
*A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05).
In the present study, there were no significant differences in any of the parameters evaluated between maxillary first and second molars and the null hypothesis was accepted.
The initial research on AC and AF morphology was done by Kuttler [2], who reported that AC can be present in the apical root dentin. The most prevalent morphotype of AC in the present study was the traditional constriction, followed by the parallel, delta, and tapering morphotypes. The multi-constriction type of AC, previously identified by Dummer et al. [3] and flared type [5] of apical morphology were not identified in our study population. Apical morphotypes similar to ours have been reported by previous researchers in North America, with AC being identified in 35% [5] and 23% [11] of root canals evaluated. However, ElAyouti et al. [6] and Schell et al. [7], who included the parallel morphotype as a type of AC, reported the presence of AC in all root canals investigated. Based on micro-CT imaging, it was evident that achieving patency of the root canal may be difficult in delta-type constrictions.
The mean AC dimensions in our study fall within the range reported in previous investigations [6,9,11,15]. In clinical terms, the mean AC dimensions in MB1 canals of the maxillary first and second molars approximately corresponded to teeth #25 and #20 instrument tip sizes, respectively. The mean AC dimensions in DB canals of both the maxillary first and second molars approximately corresponded to a tooth #20 instrument tip size. The mean AC dimensions in palatal canals of the maxillary first and second molars approximately corresponded to teeth #30 and #25 instrument tip sizes, respectively, while the mean AC dimension of MB2 canals in the first and second maxillary molars corresponded approximately to teeth #20 and #15 instrument tip sizes, respectively. This information would be of clinical value for managing endodontic interventions of the first and second maxillary molars.
The tooth #40.04 instrument has been recommended for conservative preparations of maxillary molar palatal canals [11]. ElAyouti et al. [6] recommended shaping maxillary and mandibular molars to sizes larger than tooth #25, while Versiani et al. [16] reported that apical debridement in 4-rooted maxillary molars should be done with instruments larger than ISO size 40. The wide range of constriction dimensions reported in this study indicates that it is important to assess the BLD and MDD of AC diameters and that apical shaping to smaller sizes [6] would not be beneficial.
Additionally, previous researchers have classified AC dimensions as either major diameter/minor diameter or wide/narrow diameter morphotypes [9,15]. The present study analyzed AC and apical root canal measurements in both the BLD and MDD, which may be of additional clinical utility. Our results demonstrated that MB1, MB2, and DB apical canals along with ACs were broader bucco-lingually, while palatal apical canals and Acs were broader mesio-distally in both maxillary molars. A similar mesio-distal ovoid form of palatal apical canals has been previously reported [11].
In the present study, the MDD of apical canals had 0.02 and 0.04 mm tapers in MB1 canal of the first and second molars, respectively, and a 0.04 mm taper in DB canals of both maxillary molars. The apical canal BLD presented a 0.07 mm taper in palatal canals of both maxillary molars. This finding indicates that conservative preparation of the MDD in MB1, MB2, and DB canals can be performed using 0.04–0.06 mm taper rotary instruments, and the BLD in palatal canals can be prepared using 0.06–0.08 mm taper rotary instruments with the tip size based on the initial apical binding file. Directing the files bucco-lingually in MB1, MB2, and DB canals and mesio-distally in palatal canals will ensure maximal contact between rotary instruments and root canal walls [11]. Alternatively, the use of self-adjusting files or irrigation activation techniques using XP-endo finisher or passive ultrasonic irrigation can lead to enhanced debridement of oval canals [17,18].
Among the previous micro-CT studies [5,6,7,9,11], only ElAyouti et al. [6] included samples with known age (15–60 years), while other studies [5,7,9,11] did not evaluate samples from individuals of known age. In the present study, AC dimensions were not significantly correlated with age (20–40 years vs. 41–75 years) or sex. There is some controversy in this regard, as ElAyouti et al. [6] reported that ACs became narrower with increasing age, while another study reported no significant dimensional changes with age [19]. Yet another study reported significant canal narrowing (2 mm) from the apex with increasing age, especially in palatal and MB canals, but not in DB canals of maxillary molars [4]. These varying results may reflect the difference in methodologies employed by various researchers, necessitating further micro-CT imaging research on the root canal anatomy of maxillary molars.
Our results also revealed that almost 70% of ACs were oval, and that more than 80% of apical root canals had an oval cross-section. A similar preponderance of oval forms in maxillary molars has been previously reported [15]. Therefore, accurate AC size evaluation with a round instrument can be difficult clinically [15].
In the present study, the majority (60%) of AF were located within 0.5 mm from the anatomic apex in both maxillary molars. The distance between the AF and anatomic apex was less than 1 mm in MB and DB roots, while it was up to 1.2 mm in palatal roots of the first and second maxillary molars. These results are in contrast with Marceliano-Alves et al. [9], who reported that the AF did not coincide with the anatomic apex 95% of the time in palatal roots of maxillary molars, and ElAyouti et al. [6], who reported that the AF can be more than 2 mm short of the anatomic apex in molars.
Additionally, our data showed that the mean AC-AF distance was 0.60 and 0.64 mm in the maxillary first and second molars, respectively. This finding is not consistent with those of ElAyouti et al. [6], who reported a mean AC-to-AF distance of only 0.2 mm, and that AC coincided with the AF in 14% of canals. This discrepancy may be due to the varying reference points used to evaluate the AC-AF distance. However, Kuttler [2] reported mean AC-AF distances of 0.5–0.6 mm, which is within the range reported in the present study. Furthermore, in the present study, the mean AC-AF distance was significantly greater in MB1 canals of the maxillary second molars in patients aged above 40 years. Overall, tapering-type constrictions had a mean AC-AF distance of 0.09 mm, as previously reported [6], while traditional constriction, parallel and delta-type constrictions had mean AC-AF distances ranging from 0.21 to 1.13 mm. Furthermore, among constriction types in both MB1 and DB canals of the maxillary second molars, the delta type had a significantly greater mean AC-AF distance (0.76 and 0.83 mm, respectively). In palatal canals of both the first and second maxillary molars, the traditional constriction type had a significantly greater mean AC-AF distance (0.71 and 0.73 mm, respectively) than the other constriction types. Therefore, the type of constriction may be associated with the AC-AF distance.
The presence of accessory canals in the apical 5 mm was evaluated, and it was found that accessory canals in the first and second maxillary molars were most frequently found in MB1 canals (39% and 37%, respectively) canals followed by MB2 canals (38% and 33%, respectively), DB canals (17% and 14%, respectively), and palatal canals (12% and 16%, respectively). Similarly, a previous micro-CT study by Briseno-Marroquin et al. [20], who evaluated maxillary molars from an Egyptian population, reported accessory canals in 31% of MB1 canals, 15% of DB canals, and 12% of palatal canals. Another micro-CT study that evaluated the MB roots of maxillary first molars reported that the majority of the accessory canals were found in the apical third of root canals [15]. Fused maxillary second molars showed an increased frequency of apical delta and anatomical complexities [21]. Clinically, these accessory canals and apical ramifications may be difficult to instrument and must be chemically debrided and disinfected [22].
An extensive literature review by Cleghorn et al. [23] reported that maxillary first molars can have 2 canals (MB1 and MB2) in 57% of MB roots, of which 38% may have 2 exit portals. In the present study, 91% of MB roots had an MB2 canal. However, only 21% of the MB2 canals identified had a separate exit. Furthermore, none of the samples evaluated in our study had second disto-buccal (DB2) or other extra canals.
A major limitation of the current study is the relatively small sample size and the resolution (26.7 µm) of the micro-CT system used. Therefore, future research with a larger sample size and higher-resolution micro-CT imaging will have to be done to better evaluate the effect of age and sex on AC and apical root canal anatomy. In addition, samples from different racial populations need to be assessed.
AC was present in all the root canals investigated in the present study. There were no significant differences in AC/apical canal dimensions or other parameters between the maxillary first and second molars. Age and sex did not significantly influence AC/apical canal dimensions. The major form of AC identified in maxillary molars was the traditional single constriction, followed by the parallel morphotype. More than two-thirds of ACs and apical root canal sections were oval. Most AF were located within 0.5 mm from the anatomic apex. Accessory canals were significantly more common in the MB roots of both maxillary molars than in other root types. Our data should help clinical decision-making in the endodontic treatment of the maxillary first and second molars.
The authors wish to express their gratitude to Dr. N Velmurugan and Dr. S Jothilatha for their comments and helpful discussions.

Conflict of Interest: No potential conflict of interest relevant to this article was reported.

Author Contributions:

  • Conceptualization: Chang JWW, PradeepKumar AR.

  • Data curation: Manigandan K, AdhityaVasun P.

  • Formal analysis: Manigandan K, NandhaKumar C, AdhityaVasun P, Diji J.

  • Investigation: Manigandan K, NandhaKumar C, AdhityaVasun P, Diji J.

  • Methodology: Chang JWW, PradeepKumar AR.

  • Resources:Chang JWW, PradeepKumar AR.

  • Supervision: Chang JWW, PradeepKumar AR.

  • Validation: NandhaKumar C, Diji J.

  • Writing – original draft: Chang JWW, PradeepKumar AR, Manigandan K, Samaranayake L.

  • Writing – review & editing: Chang JWW, PradeepKumar AR, Samaranayake L, Manigandan K.

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      Morphotypes of the apical constriction of maxillary molars: a micro-computed tomographic evaluation
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    Morphotypes of the apical constriction of maxillary molars: a micro-computed tomographic evaluation
    Image Image Image Image Image
    Figure 1 Apical constriction morphotypes: (A) traditional constriction, (B) parallel constriction, (C) delta constriction, and (D) tapering constriction.
    Figure 2 Complex multiple apical ramifications in a delta constriction.
    Figure 3 Apical canal dimensions: the mesio-buccal and disto-buccal canals are wider in the bucco-palatal dimension, and the palatal canal is wider in the mesio-distal dimension.
    Figure 4 Lateral view of the anatomic apex showing apical foramen deviation.
    Figure 5 Presence of accessory canals in a first mesio-buccal canal.

    Figure 1

    Figure 2

    Figure 3

    Figure 4

    Figure 5

    Morphotypes of the apical constriction of maxillary molars: a micro-computed tomographic evaluation

    Morphotypes of apical constriction (AC) in the maxillary first and second molars

    Types of ACMaxillary first molarsMaxillary second molars
    MB1DBPMB2MB1DBPMB2
    Traditional44%59%49%84%35%56%56%83%
    Parallel20%29%34%8%39%27%34%17%
    Delta34%7%15%-23%12%7%-
    Tapering2%5%2%8%3%5%3%-

    MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Dimensions (mm) of apical constriction (AC) and apical root canal at 1, 2, and 3 mm from the AC as percentages

    CanalAC–BLDAC–MDDBLD-1 mmMDD-1 mmBLD-2 mmMDD-2 mmBLD-3 mmMDD-3 mm
    Maxillary first molars
    MB1 (n = 41)0.24 ± 0.10 (0.09–0.50)0.21 ± 0.08 (0.09–0.43)0.41 ± 0.17 (0.13–0.92)0.23 ± 0.08 (0.10–0.42)0.45 ± 0.26 (0.16–1.10)0.24 ± 0.07 (0.10–0.21)0.58 ± 0.40 (0.18–1.80)0.27 ± 0.09 (0.13–0.52)
    DB (n = 41)0.19 ± 0.08 (0.06–0.43)0.19 ± 0.08 (0.06–0.36)0.29 ± 0.12 (0.09–0.53)0.22 ± 0.08 (0.10–0.49)0.33 ± 0.12 (0.06–0.61)0.23 ± 0.08 (0.12–0.48)0.38 ± 0.18 (0.09–0.79)0.27 ± 0.10 (0.09–0.52)
    P (n = 41)0.26 ± 0.09 (0.10–0.44)0.29 ± 0.11 (0.10–0.55)0.37 ± 0.11 (0.14–0.64)0.43 ± 0.13 (0.13–0.77)0.39 ± 0.10 (0.15–0.61)0.49 ± 0.17 (0.19–1.1)0.46 ± 0.13 (0.24–0.80)0.56 ± 0.20 (0.24–1.2)
    MB2 (n = 13)0.18 ± 0.05 (0.10–0.27)0.19 ± 0.07 (0.14–0.30)0.27 ± 0.06 (0.21–0.36)0.18 ± 0.03 (0.15–0.25)0.42 ± 0.16 (0.30–0.64)0.17 ± 0.06 (0.16–0.28)0.44 ± 0.13 (0.30–0.61)0.18 ± 0.06 (0.15–0.28)
    Maxillary second molars
    MB1 (n = 57)0.19 ± 0.07 (0.08–0.46)0.20 ± 0.08 (0.08–0.51)0.37 ± 0.26 (0.10–1.40)0.26 ± 0.16 (0.10–1.20)0.55 ± 0.42 (0.16–1.90)0.25 ± 0.13 (0.10–0.92)0.63 ± 0.47 (0.15–2.50)0.28 ± 0.15 (0.10–1.10)
    DB (n = 57)0.18 ± 0.06 (0.08–0.37)0.17 ± 0.07 (0.06–0.36)0.24 ± 0.10 (0.10–0.80)0.20 ± 0.06 (0.10–0.37)0.28 ± 0.11 (0.10–0.66)0.24 ± 0.08 (0.11–0.42)0.33 ± 0.15 (0.10–0.82)0.28 ± 0.11 (0.13–0.61)
    P (n = 57)0.23 ± 0.07 (0.10–0.40)0.24 ± 0.07 (0.10–0.40)0.33 ± 0.09 (0.15–0.58)0.36 ± 0.15 (0.14–1.20)0.37 ± 0.11 (0.18–0.68)0.45 ± 0.19 (0.18–1.5)0.45 ± 0.13 (0.22–0.92)0.53 ± 0.23 (0.21–1.6)
    MB2 (n = 6)0.15 ± 0.04 (0.08–0.24)0.12 ± 0.02 (0.10–0.16)0.31 ± 0.15 (0.15–0.48)0.15 ± 0.04 (0.14–0.25)0.32 ± 0.11 (0.18–0.48)0.17 ± 0.05 (0.15–0.27)0.33 ± 0.06 (0.21–0.42)0.18 ± 0.08 (0.16–0.32)

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.

    BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Profile (shape) of apical constriction (AC) and apical root canal at 1, 2, and 3 mm from the AC

    CanalMaxillary first molarsMaxillary second molars
    AC1 mm from AC2 mm from AC3 mm from ACAC1 mm from AC2 mm from AC3 mm from AC
    OROROROROROROROR
    MB17822871390109557723937964946
    DB564485159558218633775259198416
    P78227129871378226733732782188416
    MB26238928100-100-6733100-100-100-

    O, oval; R, round; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Dimensions (mm) of apical constriction (AC) and the root canal at 1, 2 and 3 mm from the AC based on age groups

    Variables20–40 years41–75 years
    MB1DBPMB2MB1DBPMB2
    Maxillary first molars(n = 16)(n = 16)(n = 16)(n = 3)(n = 25)(n = 25)(n = 25)(n = 10)
    AC–BLD0.24 ± 0.10 (0.10–0.50)0.20 ± 0.09 (0.06–0.43)0.27 ± 0.07 (0.18–0.44)0.12 ± 0.04 (0.08–0.17)0.24 ± 0.08 (0.15–0.46)0.19 ± 0.07 (0.08–0.37)0.25 ± 0.10 (0.10–0.42)0.15 ± 0.04 (0.08–0.24)
    AC–MDD0.20 ± 0.08 (0.09–0.42)0.19 ± 0.08 (0.06–0.34)0.29 ± 0.09 (0.15–0.52)0.14 ± 0.02 (0.12–0.16)0.21 ± 0.09 (0.15–0.49)0.19 ± 0.08 (0.06–0.36)0.29 ± 0.12 (0.10–0.55)0.11 ± 0.02 (0.08–0.14)
    BLD-1 mm0.36 ± 0.18 (0.21–0.92)0.29 ± 0.13 (0.09–0.53)0.37 ± 0.13 (0.14–0.55)0.32 ± 0.14 (0.20–0.48)0.44 ± 0.16 (0.13–0.76)0.29 ± 0.10 (0.09–0.49)0.37 ± 0.10 (0.18–0.64)0.31 ± 0.16 (0.15–0.72)
    MDD-1 mm0.23 ± 0.09 (0.13–0.42)0.21 ± 0.08 (0.12–0.36)0.40 ± 0.15 (0.13–0.58)0.16 ± 0.08 (0.08–0.25)0.24 ± 0.08 (0.10–0.41)0.23 ± 0.08 (0.10–0.49)0.45 ± 0.12 (0.22–0.77)0.15 ± 0.03 (0.08–0.15)
    BLD-2 mm0.45 ± 0.16 (0.21–0.91)0.34 ± 0.14 (0.06–0.61)0.39 ± 0.12 (0.16–0.52)0.39 ± 0.09 (0.30–0.48)0.49 ± 0.30 (0.16–1.10)0.33 ± 0.12 (0.09–0.61)0.40 ± 0.10 (0.15–0.61)0.30 ± 0.11 (0.18–0.48)
    MDD-2 mm0.25 ± 0.07 (0.15–0.42)0.22 ± 0.07 (0.12–0.37)0.46 ± 0.15 (0.24–0.67)0.20 ± 0.09 (0.10–0.27)0.23 ± 0.07 (0.10–0.43)0.24 ± 0.08 (0.15–0.48)0.50 ± 0.19 (0.19–1.10)0.16 ± 0.04 (0.10–0.24)
    BLD-3 mm0.52 ± 0.19 (0.26–0.98)0.39 ± 0.15 (0.09–0.67)0.49 ± 0.13 (0.27–0.73)0.36 ± 0.03 (0.34–0.40)0.57 ± 0.48 (0.18–1.80)0.38 ± 0.19 (0.12–0.79)0.45 ± 0.13 (0.24–0.80)0.32 ± 0.07 (0.21–0.42)
    MDD-3 mm0.26 ± 0.10 (0.15–0.52)0.27 ± 0.10 (0.12–0.45)0.58 ± 0.15 (0.34–0.85)0.24 ± 0.12 (0.10–0.32)0.28 ± 0.09 (0.13–0.44)0.26 ± 0.10 (0.09–0.52)0.54 ± 0.23 (0.24–1.20)0.16 ± 0.06 (0.10–0.32)
    Maxillary second molars(n = 14)(n = 14)(n = 14)(n = 4)(n = 43)(n = 43)(n = 43)(n = 2)
    AC–BLD0.21 ± 0.06 (0.13–0.42)0.17 ± 0.07 (0.08–0.34)0.22 ± 0.06 (0.12–0.32)0.16 ± 0.04 (0.10–0.19)0.18 ± 0.07 (0.08–0.46)0.18 ± 0.06 (0.08–0.37)0.22 ± 0.07 (0.10–0.40)0.24
    AC–MDD0.22 ± 0.08 (0.10–0.45)0.16 ± 0.06 (0.08–0.29)0.24 ± 0.07 (0.12–0.37)0.19 ± 0.07 (0.15–0.30)0.19 ± 0.08 (0.08–0.51)0.18 ± 0.07 (0.06–0.36)0.24 ± 0.07 (0.10–0.40)0.21
    BLD-1 mm0.36 ± 0.18 (0.10–0.90)0.23 ± 0.07 (0.10–0.37)0.29 ± 0.08 (0.15–0.42)0.29 ± 0.07 (0.21–0.36)0.37 ± 0.29 (0.13–1.40)0.25 ± 0.11 (0.10–0.80)0.34 ± 0.10 (0.18–0.58)0.27
    MDD-1 mm0.26 ± 0.08 (0.13–0.48)0.18 ± 0.05 (0.10–0.28)0.34 ± 0.09 (0.14–0.50)0.17 ± 0.01 (0.15–0.18)0.26 ± 0.18 (0.10–1.20)0.21 ± 0.06 (0.10–0.37)0.36 ± 0.16 (0.22–0.66)0.21
    BLD-2 mm0.61 ± 0.46 (0.16–1.60)0.30 ± 0.14 (0.12–0.66)0.32 ± 0.10 (0.18–0.48)0.40 ± 0.16 (0.28–0.64)0.53 ± 0.41 (0.16–1.90)0.28 ± 0.10 (0.10–0.51)0.38 ± 0.11 (0.21–0.68)0.47
    MDD-2 mm0.27 ± 0.10 (0.13–0.46)0.22 ± 0.09 (0.12–0.42)0.43 ± 0.14 (0.18–0.64)0.15 ± 0.04 (0.08–0.18)0.24 ± 0.15 (0.10–0.92)0.25 ± 0.07 (0.11–0.42)0.45 ± 0.21 (0.21–1.50)0.23
    BLD-3 mm0.67 ± 0.43 (0.21–1.60)0.30 ± 0.14 (0.13–0.65)0.41 ± 0.11 (0.22–0.66)0.42 ± 0.13 (0.30–0.61)0.67 ± 0.49 (0.15–2.50)0.34 ± 0.16 (0.10–0.82)0.46 ± 0.13 (0.24–0.92)0.48
    MDD-3 mm0.31 ± 0.10 (0.10–0.46)0.28 ± 0.14 (0.13–0.61)0.49 ± 0.16 (0.24–0.88)0.16 ± 0.04 (0.09–0.19)0.27 ± 0.16 (0.10–1.10)0.28 ± 0.10 (0.13–0.58)0.54 ± 0.25 (0.21–1.60)0.22

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.

    AC, apical constriction; BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Dimensions (mm) of apical constriction (AC) and root canal at 1, 2 and 3 mm from the AC based on sex

    VariablesMaleFemale
    MB1DBPMB2MB1DBPMB2
    Maxillary first molars(n = 25)(n = 25)(n = 25)(n = 2)(n = 16)(n = 16)(n = 16)(n = 11)
    AC–BLD0.23 ± 0.08 (0.09–0.42)0.20 ± 0.08 (0.06–0.43)0.26 ± 0.09 (0.10–0.44)0.140.26 ± 0.13 (0.10–0.50)0.18 ± 0.08 (0.08–0.34)0.26 ± 0.09 (0.10–0.42)0.14 ± 0.05 (0.08–0.24)
    AC–MDD0.20 ± 0.07 (0.10–0.42)0.20 ± 0.07 (0.06–0.36)0.28 ± 0.12 (0.10–0.52)0.130.22 ± 0.10 (0.09–0.43)0.19 ± 0.09 (0.06–0.34)0.30 ± 0.11 (0.17–0.55)0.11 ± 0.02 (0.08–0.16)
    BLD-1 mm0.41 ± 0.19 (0.21–0.92)0.29 ± 0.11 (0.09–0.49)0.38 ± 0.11 (0.14–0.64)0.310.40 ± 0.14 (0.13–0.67)0.29 ± 0.12 (0.09–0.53)0.36 ± 0.12 (0.18–0.55)0.31 ± 0.15 (0.20–0.72)
    MDD-1 mm0.23 ± 0.07 (0.13–0.42)0.23 ± 0.09 (0.12–0.49)0.42 ± 0.12 (0.13–0.64)0.110.25 ± 0.10 (0.10–0.41)0.21 ± 0.08 (0.10–0.36)0.45 ± 0.15 (0.22–0.77)0.15 ± 0.04 (0.08–0.25)
    BLD-2 mm0.48 ± 0.27 (0.24–1.10)0.33 ± 0.14 (0.06–0.61)0.38 ± 0.10 (0.16–0.61)0.300.41 ± 0.25 (0.16–1.10)0.33 ± 0.11 (0.09–0.52)0.41 ± 0.11 (0.15–0.61)0.32 ± 0.10 (0.18–0.48)
    MDD-2 mm0.24 ± 0.07 (0.13–0.43)0.24 ± 0.08 (0.12–0.48)0.47 ± 0.18 (0.24–1.10)0.130.25 ± 0.07 (0.10–0.21)0.23 ± 0.07 (0.15–0.37)0.51 ± 0.16 (0.19–0.78)0.17 ± 0.05 (0.10–0.27)
    BLD-3 mm0.60 ± 0.45 (0.21–1.80)0.38 ± 0.19 (0.09–0.79)0.45 ± 0.12 (0.24–0.73)0.280.48 ± 0.29 (0.18–0.43)0.38 ± 0.16 (0.12–0.70)0.48 ± 0.15 (0.24–0.80)0.34 ± 0.05 (0.24–0.42)
    MDD-3 mm0.27 ± 0.10 (0.15–0.52)0.27 ± 0.10 (0.12–0.52)0.55 ± 0.22 (0.24–1.20)0.130.29 ± 0.09 (0.13–0.40)0.26 ± 0.10 (0.09–0.45)0.57 ± 0.17 (0.34–1.04)0.18 ± 0.09 (0.10–0.32)
    Maxillary second molars(n = 18)(n = 18)(n = 18)(n = 5)(n = 39)(n = 39)(n = 39)(n = 1)
    AC–BLD0.18 ± 0.07 (0.08–0.42)0.17 ± 0.06 (0.08–0.29)0.24 ± 0.07 (0.13–0.40)0.19 ± 0.05 (0.10–0.27)0.19 ± 0.07 (0.10–0.46)0.18 ± 0.06 (0.08–0.37)0.23 ± 0.07 (0.10–0.39)0.15
    AC–MDD0.20 ± 0.08 (0.11–0.45)0.17 ± 0.07 (0.06–0.28)0.25 ± 0.08 (0.10–0.40)0.20 ± 0.07 (0.15–0.30)0.20 ± 0.08 (0.08–0.51)0.17 ± 0.07 (0.08–0.36)0.23 ± 0.06 (0.10–0.37)0.16
    BLD-1 mm0.37 ± 0.34 (0.13–1.40)0.24 ± 0.15 (0.13–0.80)0.30 ± 0.10 (0.18–0.56)0.26 ± 0.06 (0.21–0.33)0.36 ± 0.21 (0.10–1.10)0.24 ± 0.08 (0.10–0.40)0.34 ± 0.09 (0.10–0.58)0.36
    MDD-1 mm0.22 ± 0.10 (0.10–0.48)0.20 ± 0.05 (0.13–0.30)0.31 ± 0.07 (0.22–0.50)0.18 ± 0.03 (0.15–0.25)0.28 ± 0.18 (0.10–1.20)0.20 ± 0.06 (0.10–0.37)0.38 ± 0.17 (0.14–1.20)0.18
    BLD-2 mm0.59 ± 0.49 (0.18–1.90)0.24 ± 0.10 (0.13–0.45)0.35 ± 0.11 (0.21–0.61)0.37 ± 0.16 (0.30–0.61)0.53 ± 0.39 (0.16–1.90)0.30 ± 0.11 (0.10–0.66)0.38 ± 0.11 (0.18–0.68)0.64
    MDD-2 mm0.21 ± 0.08 (0.1–0.39)0.22 ± 0.07 (0.11–0.42)0.39 ± 0.11 (0.21–0.64)0.19 ± 0.06 (0.16–0.28)0.27 ± 0.15 (0.10–0.92)0.25 ± 0.08 (0.12–0.42)0.47 ± 0.21 (0.18–1.50)0.08
    BLD-3 mm0.60 ± 0.58 (0.15–2.50)0.26 ± 0.15 (0.10–0.73)0.43 ± 0.15 (0.24–0.92)0.40 ± 0.13 (0.30–0.61)0.61 ± 0.41 (0.18–2.20)0.36 ± 0.15 (0.10–0.82)0.46 ± 0.12 (0.22–0.70)0.61
    MDD-3 mm0.24 ± 0.10 (0.10–0.46)0.24 ± 0.12 (0.13–0.58)0.47 ± 0.19 (0.21–1.10)0.19 ± 0.06 (0.16–0.28)0.31 ± 0.17 (0.10–1.10)0.30 ± 0.11 (0.13–0.61)0.56 ± 0.14 (0.24–1.60)0.09

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.

    AC, apical constriction; BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Dimensions (mm) of apical constriction (AC) based on AC types

    CanalTraditionalParallelDeltaTapering
    BLDMDDBLDMDDBLDMDDBLDMDD
    Maxillary first molars
    MB10.21 ± 0.08 (0.09–0.39)0.18 ± 0.06 (0.09–0.32)0.33 ± 0.11 (0.21–0.46)0.29* ± 0.12 (0.09–0.14)0.23 ± 0.10 (0.10–0.50)0.21 ± 0.05 (0.10–0.33)0.240.21
    DB0.16 ± 0.06 (0.06–0.33)0.17 ± 0.07 (0.06–0.34)0.23 ± 0.07 (0.11–0.37)0.24 ± 0.06 (0.13–0.36)0.25 ± 0.17 (0.09–0.43)0.18 ± 0.10 (0.09–0.30)0.270.30
    P0.26 ± 0.09 (0.10–0.40)0.30 ± 0.11 (0.14–0.55)0.26 ± 0.10 (0.10–0.42)0.27 ± 0.09 (0.10–0.41)0.26 ± 0.10 (0.17–0.44)0.28 ± 0.17 (0.14–0.52)0.300.30
    MB20.15 ± 0.05 (0.08–0.24)0.11 ± 0.02 (0.08–0.16)0.100.12--0.130.13
    Maxillary second molars
    MB10.18 ± 0.07 (0.10–0.46)0.19 ± 0.07 (0.08–0.42)0.22 ± 0.08 (0.10–0.42)0.23 ± 0.09 (0.10–0.51)0.15 ± 0.04 (0.08–0.26)0.16 ± 0.04 (0.11–0.25)0.170.19
    DB0.16 ± 0.07 (0.10–0.37)0.15 ± 0.06 (0.06–0.34)0.20 ± 0.05 (0.11–0.29)0.20 ± 0.06 (0.13–0.36)0.22* ± 0.05 (0.16–0.34)0.19 ± 0.07 (0.10–0.29)0.150.17
    P0.23 ± 0.06 (0.12–0.39)0.23 ± 0.06 (0.10–0.37)0.25 ± 0.08 (0.10–0.37)0.26 ± 0.07 (0.10–0.40)0.20 ± 0.07 (0.13–0.28)0.17 ± 0.05 (0.13–0.25)0.250.24
    MB20.16 ± 0.04 (0.10–0.22)0.18 ± 0.06 (0.15–0.30)0.270.28----

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.

    BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    *A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05). The tapering constriction did not have a standard deviation and range, as only 12 samples were available.

    Apical constriction (AC) to apical foramen (AF) distance (mm), position of AF and presence of accessory canals in the maxillary first and second molars

    CanalAC-AF distance (mm)Position of AFAccessory canals
    Root tipDeviatedAF-Apex distance (mm)PresenceAbsence
    Maxillary first molars
    MB10.57 ± 0.21 (0.09–1.10)28 (68.3)13 (31.7)0.65 ± 0.13 (0.51–0.92)16 (39.0)25 (61.0)
    DB0.65 ± 0.16 (0.09–0.98)32 (78.0)9 (22.0)0.61 ± 0.08 (0.51–0.72)7 (17.1)34 (82.9)
    P0.62 ± 0.21 (0.08–0.94)27 (65.9)14 (34.1)0.70 ± 0.18 (0.51–1.20)5 (12.2)36 (87.8)
    MB20.56 ± 0.25 (0.08–1.02)9 (69.2)4 (30.8)0.52 ± 0.18 (0.51–0.76)5 (38.5)8 (61.5)
    Maxillary second molars
    MB10.64 ± 0.24 (0.08–1.13)21 (36.8)36 (63.2)0.60 ± 0.09 (0.51–0.83)21 (36.8)36 (63.2)
    DB0.67 ± 0.20 (0.09–1)42 (73.7)15 (26.3)0.58 ± 0.08 (0.51–0.78)8 (14.0)49 (86.0)
    P0.69 ± 0.20 (0.08–0.98)42 (73.7)15 (26.3)0.70 ± 0.08 (0.51–1.20)9 (15.8)48 (84.2)
    MB20.57 ± 0.18 (0.24–0.72)2 (33.3)4 (66.7)0.56 ± 0.16 (0.51–0.71)2 (33.3)4 (66.7)
    Combined maxillary first and second molars
    MB10.61 ± 0.23 (0.08–1.13)49 (50.0)49 (50.0)0.62 ± 0.11 (0.51–0.92)37 (37.8)61 (62.2)
    DB0.66 ± 0.18 (0.09–1)74 (75.5)24 (24.5)0.59 ± 0.08 (0.51–0.78)15 (15.3)83 (84.7)
    P0.66 ± 0.21 (0.08–0.98)69 (70.4)29 (29.6)0.70 ± 0.19 (0.51–1.20)14 (14.3)84 (85.7)
    MB20.56 ± 0.22 (0.08–1.02)11 (57.9)8 (42.1)0.54 ± 0.16 (0.51–0.76)7 (36.8)12 (63.2)

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis. Data shown are number (%) when not otherwise specified.

    MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Apical constriction (AC) - apical foramen (AF) distance (mm) based on AC types, age groups and sex

    VariablesMaxillary first molarsMaxillary second molars
    MB1DBPMB2MB1DBPMB2
    Type of AC
    Traditional0.56 ± 0.19 (0.30–0.92)0.62 ± 0.15 (0.24–0.92)0.71* ± 0.21 (0.24–0.94)0.59 ± 0.26 (0.18–1.02)0.67 ± 0.23 (0.32–1.13)0.62 ± 0.16 (0.35–1)0.73* ± 0.19 (0.29–0.98)0.56 ± 0.19 (0.24–0.72)
    Parallel0.64 ± 0.27 (0.4–1.10)0.70 ± 0.11 (0.55–0.92)0.55 ± 0.20 (0.23–0.86)0.510.57 ± 0.25 (0.23–1.10)0.76 ± 0.18 (0.43–1)0.67 ± 0.19 (0.29–0.94)0.64 (1)
    Delta0.54 ± 0.19 (0.21–0.89)0.76 ± 0.23 (0.52–0.98)0.52 ± 0.18 (0.42–0.61)-0.76* ± 0.17 (0.54–1.10)0.83* ± 0.16 (0.51–1)0.71 ± 0.10 (0.62–0.86)-
    Tapering0.090.090.080.080.080.090.08-
    Age groups
    20–40 years0.56 ± 0.22 (0.21–0.97)0.63 ± 0.16 (0.24–0.98)0.62 ± 0.21 (0.23–0.94)0.77 ± 0.25 (0.51–1.02)0.53 ± 0.18 (0.29–0.89)0.73 ± 0.23 (0.35–1)0.61 ± 0.24 (0.29–0.94)0.53 ± 0.08 (0.24–0.72)
    41–75 years0.57 ± 0.19 (0.30–1.10)0.66 ± 0.16 (0.30–0.92)0.62 ± 0.21 (0.24–0.94)0.50 ± 0.22 (0.08–1)0.68* ± 0.25 (0.15–1.13)0.65 ± 0.19 (0.13–1)0.72 ± 0.18 (0.19–0.98)0.67
    Sex
    Male0.57 ± 0.21 (0.21–0.97)0.68 ± 0.14 (0.30–0.98)0.62 ± 0.20 (0.23–0.94)0.360.60 ± 0.23 (0.15–1.05)0.66 ± 0.23 (0.13–1)0.77* ± 0.14 (0.56–0.98)0.57 ± 0.20 (0.24–0.72)
    Female0.56 ± 0.21 (0.30–1.10)0.61 ± 0.17 (0.24–0.92)0.61 ± 0.23 (0.24–0.94)0.59 ± 0.25 (0.18–1.02)0.66 ± 0.24 (0.29–1.13)0.67 ± 0.19 (0.32–1)0.65 ± 0.21 (0.19–0.94)0.58

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.

    MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    *A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05). The tapering constriction did not have a standard deviation and range, as only 12 samples were available.

    Position of apical foramen (AF) based on apical constriction (AC) types, age groups, and sex

    CanalMaxillary first molarsMaxillary second molars
    Root tipDeviatedAF-apex distance (mm)Root tipDeviatedAF-apex distance (mm)
    MB1
    Type of AC
    Traditional13 (72.2)5 (27.8)0.71 ± 0.19 (0.51–0.92)18 (90.0)2 (10.0)0.51
    Parallel6 (75.0)2 (25.0)0.63-22* (100.0)0.59 ± 0.08 (0.51–0.76)
    Delta8 (57.1)6 (42.9)0.67 ± 0.07 (0.51–0.65)1 (7.7)12* (92.3)0.59 ± 0.12 (0.51–0.83)
    Tapering1 (100.0)--2 (100.0)--
    Age group
    20–40 years10 (62.5)6 (37.5)0.68 ± 0.18 (0.51–0.92)5 (35.7)9 (64.3)0.63 ± 0.10 (0.53–0.83)
    41–75 years18 (72.0)7 (28.0)0.62 ± 0.07 (0.51–0.76)16 (37.2)27 (62.8)0.56 ± 0.09 (0.51–0.76)
    Sex
    Male16 (64.0)9 (36.0)0.62 ± 0.12 (0.51–0.92)5 (27.8)13 (72.2)0.58 ± 0.08 (0.51–0.72)
    Female12 (75.0)4 (25.0)0.72 ± 0.14 (0.60–0.92)16 (41.0)23 (59.0)0.59 ± 0.11 (0.51–0.83)
    DB
    Type of AC
    Traditional20 (83.3)4 (16.7)0.61 ± 0.11 (0.51–0.72)21 (65.6)11 (34.4)0.61 ± 0.08 (0.51–0.78)
    Parallel9 (75.0)3 (25.0)0.67 ± 0.10 (0.51–0.72)13 (86.7)2 (13.3)0.51
    Delta1 (33.3)2 (66.7)0.605 (71.4)2 (28.6)0.53
    Tapering2 (100.0)--3 (100.0)--
    Age group
    20–40 years13 (81.3)3 (18.8)0.62 ± 0.10 (0.51–0.71)8 (57.1)6 (42.9)0.57 ± 0.06 (0.51–0.64)
    41–75 years19 (76.0)6 (24.0)0.61 ± 0.09 (0.51–0.72)34 (79.1)9 (20.9)0.59 ± 0.10 (0.51–0.78)
    Sex
    Male20 (80.0)5 (20.0)0.66 ± 0.08 (0.52–0.72)10 (55.6)8* (44.4)0.56 ± 0.11 (0.51–0.78)
    Female12 (75.0)4 (25.0)0.55 ± 0.06 (0.51–0.64)32 (82.1)7 (17.9)0.61 ± 0.02 (0.57–0.64)
    P
    Type of AC
    Traditional15 (75.0)5 (25.0)0.73 ± 0.16 (0.57–0.96)27 (84.4)5 (15.6)0.71 ± 0.28 (0.51–1.20)
    Parallel7 (50.0)7 (50.0)0.63 ± 0.07 (0.55–0.73)11 (57.9)8 (42.1)0.72 ± 0.16 (0.51–0.96)
    Delta4 (66.7)2 (33.3)0.852 (50.0)2 (50.0)0.60
    Tapering1 (100.0)--2 (100.0)--
    Age group
    20–40 years8 (50.0)8* (50.0)0.72* ± 0.21 (0.55–1.20)8 (57.1)6 (42.9)0.64* ± 0.09 (0.51–0.74)
    41–75 years19 (76.0)6 (24.0)0.66 ± 0.16 (0.51–0.96)34 (79.1)9 (20.9)0.75 ± 0.24 (0.51–1.20)
    Sex
    Male19 (76.0)6 (24.0)0.75 ± 0.27 (0.51–1.20)13 (72.2)5 (27.8)0.82 ± 0.26 (0.51–1.20)
    Female8 (50.0)8 (50.0)0.66 ± 0.10 (0.55–0.85)29 (74.4)10 (25.6)0.65 ± 0.14 (0.51–0.90)
    MB2
    Type of AC
    Traditional8 (72.7)3 (27.3)0.53 ± 0.34 (0.51–0.57)2 (40.0)3 (60.0)0.55 ± 0.19 (0.51–0.71)
    Parallel-1 (100.0)0.76-1 (100.0)0.58
    Delta------
    Tapering1 (100.0)-----
    Age group
    20–40 years2 (66.7)1 (33.3)0.762 (50.0)2 (50.0)0.61
    41–75 years7 (70.0)3 (30.5)0.53 ± 0.34 (0.51–0.57)-2 (100.0)0.64
    Sex
    Male1 (50.0)1 (50.0)0.571 (20.0)4 (80.0)0.60 ± 0.08 (0.51–0.71)
    Female8 (72.7)3 (27.3)0.59 ± 0.14 (0.51–0.76)1 (100.0)--

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis. Data shown are number (%) when not otherwise specified.

    MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    *A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05).

    Presence of accessory canals based on apical constriction (AC) types, age groups and sex

    CanalMaxillary first molarsMaxillary second molars
    n (presence %)n (presence %)
    MB1
    Type of AC
    Traditional10 (56)7 (35)
    Parallel6* (75)13* (59)
    Delta--
    Tapering-1 (50)
    Age group
    20–40 years4 (25)10* (71)
    41–75 years12 (48)11 (26)
    Sex
    Male11 (44)6 (33)
    Female5 (31)15 (38)
    DB
    Type of AC
    Traditional3 (13)4 (13)
    Parallel3 (25)3 (20)
    Delta--
    Tapering1 (50)1 (33)
    Age group
    20–40 years1 (6)1 (7)
    41–75 years6 (24)7 (16)
    Sex
    Male3 (12)-
    Female4 (25)8* (20)
    P
    Type of AC
    Traditional4 (20)5* (16)
    Parallel1 (7)2 (10)
    Delta--
    Tapering-2 (100)
    Age group
    20–40 years2 (13)3 (21)
    41–75 years3 (12)6 (14)
    Sex
    Male5 (20)-
    Female-9* (23)
    MB2
    Type of AC
    Traditional4 (36)2 (40)
    Parallel1 (100)-
    Delta--
    Tapering--
    Age group
    20–40 years3 (100)2 (50)
    41–75 years2 (20)-
    Sex
    Male1 (50)1 (20)
    Female4 (36)1 (100)

    MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    *A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05).
    Table 1 Morphotypes of apical constriction (AC) in the maxillary first and second molars

    MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Table 2 Dimensions (mm) of apical constriction (AC) and apical root canal at 1, 2, and 3 mm from the AC as percentages

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.

    BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Table 3 Profile (shape) of apical constriction (AC) and apical root canal at 1, 2, and 3 mm from the AC

    O, oval; R, round; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Table 4 Dimensions (mm) of apical constriction (AC) and the root canal at 1, 2 and 3 mm from the AC based on age groups

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.

    AC, apical constriction; BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Table 5 Dimensions (mm) of apical constriction (AC) and root canal at 1, 2 and 3 mm from the AC based on sex

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.

    AC, apical constriction; BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Table 6 Dimensions (mm) of apical constriction (AC) based on AC types

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.

    BLD, bucco-lingual dimension; MDD, mesio-distal dimension; MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    *A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05). The tapering constriction did not have a standard deviation and range, as only 12 samples were available.

    Table 7 Apical constriction (AC) to apical foramen (AF) distance (mm), position of AF and presence of accessory canals in the maxillary first and second molars

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis. Data shown are number (%) when not otherwise specified.

    MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    Table 8 Apical constriction (AC) - apical foramen (AF) distance (mm) based on AC types, age groups and sex

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis.

    MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    *A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05). The tapering constriction did not have a standard deviation and range, as only 12 samples were available.

    Table 9 Position of apical foramen (AF) based on apical constriction (AC) types, age groups, and sex

    The dimension is indicated as mean ± standard deviation and the range of the value is indicated in the parenthesis. Data shown are number (%) when not otherwise specified.

    MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    *A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05).

    Table 10 Presence of accessory canals based on apical constriction (AC) types, age groups and sex

    MB1, first mesio-buccal; DB, disto-buccal; P, palatal; MB2, second mesio-buccal.

    *A superscript asterisk indicates statistical significance within the canal category of the first or second molar (p < 0.05).

    Table 1

    Table 2

    Table 3

    Table 4

    Table 5

    Table 6

    Table 7

    Table 8

    Table 9

    Table 10

    Restor Dent Endod : Restorative Dentistry & Endodontics
    © The Korean Academy of Conservative Dentistry.
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