CBCT study of mandibular first molars with a distolingual root in Koreans
Kim Hee-Ho, 조희숙, 민정범, 황호길,
소속 상세정보
( Kim Hee-Ho ) - Chosun University School of Dentistry Department of Conservative Dentistry
조희숙 ( Jo Heui-Sug ) - Chosun University School of Dentistry Department of Conservative Dentistry
민정범 ( Min Jeong-Bum ) - Chosun University School of Dentistry Department of Conservative Dentistry
황호길 ( Hwang Ho-Keel ) - Chosun University School of Dentistry Department of Conservative Dentistry
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.
키워드
Cone-beam computed tomography; Cortical bone; Korean; Mandibular; Root
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