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 mandibular second molar with radix entomolaris: a case report: Rosaline Hannah, Deivanayagam Kandaswamy, Nachimuthu Jayaprakash; Restor Dent Endod 2014;39(2):132-136. Published online March 21, 2014; DOI: https://doi.org/10.5395/rde.2014.39.2.132

Abstract PDF PubReader ePub: The presence of radix entomolaris (RE) in a mandibular first molar is a common occurrence in certain ethnic groups, but the presence of RE in a mandibular second molar is a rare occurrence. In the present case, RE was identified from preoperative radiographs and confirmed using cone-beam computed tomography (CBCT). The access cavity was modified to locate the RE. Cleaning and shaping were performed with nickel-titanium rotary instruments. Obturation was completed with gutta-percha cones using AH Plus (Dentsply Detrey GmbH) as sealer. From the CBCT axial images, the RE was determined to have a Type III curvature by the De Moor classification, Type B separate RE by the Carlsen and Alexandersen classification, and radiographically, a Type i image by the Wang classification. The presence of RE in the mandibular second molar makes it essential to anticipate and treat the distolingual root canal. This case report highlights the usefulness of CBCT for assessing RE in the mandibular second molar, which can help the clinician in making a confirmatory diagnosis and assessing the morphology of the root canal.

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