Restorative Dentistry & Endodontics

Research Article

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.

Case Report

Endodontic management of a maxillary first molar with three roots and seven root canals with the aid of cone-beam computed tomography: Gurudutt Nayak, Kamal Krishan Singh, Rhitu Shekhar; Restor Dent Endod 2015;40(3):241-248. Published online June 3, 2015; DOI: https://doi.org/10.5395/rde.2015.40.3.241

Abstract PDF PubReader ePub: Variation in root canal morphology, especially in maxillary first molar presents a constant challenge for a clinician in their detection and management. This case report describes the successful root canal treatment of a three rooted right maxillary first molar presenting with three canals each in the mesiobuccal and distobuccal roots and one canal in the palatal root. The clinical detection of this morphologic aberration was made using a dental operating microscope, and the canal configuration was established after correlating and computing the clinical, radiographic and cone-beam computed tomography (CBCT) scan findings. CBCT images confirmed the configuration of the canals in the mesiobuccal and distobuccal roots to be Al-Qudah and Awawdeh type (3-2) and type (3-2-1), respectively, whereas the palatal root had a Vertucci type I canal pattern. This report reaffirms the importance of careful examination of the floor of the pulp chamber with a dental operating microscope and the use of multiangled preoperative radiographs along with advanced diagnostic aids such as CBCT in identification and successful management of aberrant canal morphologies.

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