Restor Dent Endod.  2020 Feb;45(1):e1. 10.5395/rde.2020.45.e1.

The prevalence of radix molaris in the mandibular first molars of a Saudi subpopulation based on cone-beam computed tomography

Affiliations
  • 1Dental Department, Ministry of Health Endodontist, Huraymala General Hospital, Riyadh, Saudi Arabia.
  • 2Department of Restorative Dentistry-Endodontics, College of Dentistry, Riyadh Elm University, Riyadh, Saudi Arabia. saad.alnazhan@riyadh.edu.sa
  • 3Department of Preventive Dental Sciences-Biostatistics, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
  • 4Department of Oral Medicine and Diagnostic Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
  • 5Department of Preventive Dental Sciences, College of Dentistry, Prince Sattam Bin AbdulAziz University, Al Kharj, Saudi Arabia.
  • 6General Practitioner, Riyadh, Saudi Arabia.

Abstract


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.

Keyword

Cone-beam CT; Mandibular first molar; Radix entomolaris; Radix molaris; Root canal morphology

MeSH Terms

Cone-Beam Computed Tomography*
Dental Pulp Cavity
Female
Humans
Incidence
Male
Molar*
Prevalence*

Figure

  • Figure 1. (A) Cone-beam computed tomography (CBCT) images of mandibular first molar showing 4 canals (arrow). (B) CBCT showing disto-buccal root with one canal (arrow). (C) Separated distal roots with one canal each (arrow).

  • Figure 2. (A) Cone-beam computed tomography (CBCT) images of mandibular first molar showing disto-lingual root bilateral entomolaris (arrow). (B) Bilateral separated roots with one canal (arrow).


Reference

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