Restor Dent Endod.  2018 Aug;43(3):e33. 10.5395/rde.2018.43.e33.

CBCT study of mandibular first molars with a distolingual root in Koreans

Affiliations
  • 1Department of Conservative Dentistry, Chosun University School of Dentistry, Gwangju, Korea. rootcanal@hanmail.net

Abstract


OBJECTIVES
This study aimed to investigate the prevalence of a separate distolingual root and to measure the thickness of the buccal cortical bone in mandibular first molars in Koreans using cone-beam computed tomography (CBCT) images.
MATERIALS AND METHODS
High-quality CBCT data from 432 patients were analyzed in this study. The prevalence of a separate distolingual root of the mandibular first molar was investigated. The distance from the distobuccal and distolingual root apices to the outer surface of the buccal cortical bone was measured. We also evaluated the thickness of the buccal cortical bone.
RESULTS
The prevalence of a separate distolingual root (2 separate distal roots with 1 canal in each root; 2R2C) was 23.26%. In mandibular first molars with 2R2C, the distance from the distobuccal root apex to the outer surface of the buccal cortical bone was 5.51 mm. Furthermore, the distance from the distolingual root apex to the outer surface of the buccal cortical bone was 12.09 mm. In mandibular first molars with 2R2C morphology, the thickness of the buccal cortical bone at the distobuccal root apex of the mandibular first molar was 3.30 mm. The buccal cortical bone at the distobuccal root apex was significantly thicker in the right side (3.38 mm) than the left side (3.09 mm) (p < 0.05).
CONCLUSIONS
A separate distolingual root is not rare in mandibular first molars in the Korean population. Anatomic and morphologic knowledge of the mandibular first molar can be useful in treatment planning, including surgical endodontic treatment.

Keyword

Cone-beam computed tomography; Cortical bone; Korean; Mandibular; Root

MeSH Terms

Cone-Beam Computed Tomography
Humans
Molar*
Prevalence
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