Restorative Dentistry & Endodontics

The prevalence of radix molaris in the mandibular first molars of a Saudi subpopulation based on cone-beam computed tomography: Hassan AL-Alawi, Saad Al-Nazhan, Nassr Al-Maflehi, Mazen A. Aldosimani, Mohammed Nabil Zahid, Ghadeer N. Shihabi; Restor Dent Endod 2020;45(1):e1. Published online November 14, 2019; DOI: https://doi.org/10.5395/rde.2020.45.e1

Abstract PDF PubReader ePub: Objectives
The purpose of this study was to determine the incidence of radix molaris (RM) (entomolaris and paramolaris) in the mandibular first permanent molars of a sample Saudi Arabian subpopulation using cone-beam computed tomography (CBCT).
Materials and Methods
A total of 884 CBCT images of 427 male and 457 female Saudi citizens (age 16 to 70 years) were collected from the radiology department archives of 4 dental centers. A total of 450 CBCT images of 741 mature mandibular first molars that met the inclusion criteria were reviewed. The images were viewed at high resolution by 3 examiners and were analyzed with Planmeca Romexis software (version 5.2).
Results
Thirty-three (4.5%) mandibular first permanent molars had RM, mostly on the distal side. The incidence of radix entomolaris (EM) was 4.3%, while that of radix paramolaris was 0.3%. The RM roots had one canal and occurred more unilaterally. No significant difference in root configuration was found between males and females (p > 0.05). Types I and III EM root canal configurations were most common, while type B was the only RP configuration observed.
Conclusions
The incidence of RM in the mandibular first molars of this Saudi subpopulation was 4.5%. Identification of the supernumerary root can avoid missing the canal associated with the root during root canal treatment.

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Endodontic treatment of a mandibular first molar with 8 canals: a case report: Ankit Arora, Shashi Rashmi Acharya, Padmaja Sharma; Restor Dent Endod 2015;40(1):75-78. Published online October 13, 2014; DOI: https://doi.org/10.5395/rde.2015.40.1.75

Abstract PDF PubReader ePub: Presented here is a case where 8 canals were located in a mandibular first molar. A patient with continuing pain in mandibular left first molar even after completion of biomechanical preparation was referred by a dentist. Following basic laws of the pulp chamber floor anatomy, 8 canals were located in three steps with 4 canals in each root. In both of the roots, 4 separate canals commenced which joined into two canals and exited as two separate foramina. At 6 mon follow-up visit, the tooth was found to be asymptomatic and revealed normal radiographic periapical area. The case stresses on the fact that understanding the laws of pulp chamber anatomy and complying with them while attempting to locate additional canals can prevent missing canals.

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Morphology of the apical root canal system in Korean mandibular first molar: Hyeon Jeong, Sang-jin Park, Sang-Hyuk Park, Gi-Woon Choi; J Korean Acad Conserv Dent 2009;34(2):137-144. Published online March 31, 2009; DOI: https://doi.org/10.5395/JKACD.2009.34.2.137

Abstract PDF PubReader ePub

The aim of this study was to investigate the shapes and diameters of the physiological foramen and anatomy of the root canal at 3mm from apex in mandibular first molars.

Sixty mandibular first molars were randomly selected. The apical anatomy of 60 mandibular first molars was investigated by means of a stereomicroscope (60x magnification).

The results were as follows;

1. There was a high percentage of two physiological foramina in mesial (61.67%) and one foramen in distal(71.66%) roots of mandibular first molars.

2.There was a high frequency of accessory foramina in mesial roots with one foramen (26.07%).

3. The diameters of physiological foramen was as follows:

0.329mm in single mesial foramen

0.266mm in mesiobuccal foramen and 0.246mm in mesiolingual foramen

0.375mm in single distal foramen

0.291mm in distobuccal foramen and 0.237mm in distolingual foramen

4. The most common physiological foramen shape was oval (69.93%).

5. The incidence of isthmus in mesial root at 3mm from apex was 55%. The 3mm-sections contained a complete isthmus 31.66% and a partial isthmus 23.34%.

6. 3mm from the apex, the most common canal shape was oval (50.64%).

Knowledge of the apical anatomy of mandibular first molar would be necessary for success of surgical and nonsurgical endodontic treatment.

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