MANDIBULAR PRIMARY MOLARS WITH 3 ROOTS : CASE REPORT

Song, Je Seon; Choi, Byung-Jai; Choi, Hyung-Jun; Lee, Jae-Ho; Son, Heung-Kyu; Kim, Seong-Oh

Journal of the Korean Academy of Pediatric Dentistry 2008;35(1):167-174.
Published online February 29, 2008.

MANDIBULAR PRIMARY MOLARS WITH 3 ROOTS : CASE REPORT

Je Seon Song, Byung-Jai Choi, Hyung-Jun Choi, Jae-Ho Lee, Heung-Kyu Son, Seong-Oh Kim

Department of Pediatric Dentistry, College of Dentistry and Oral Science Research Center Yonsei University

3개의 치근을 가진 하악 유구치 : 증례보고

송제선, 최병재, 최형준, 이제호, 손흥규, 김성오

연세대학교 치과대학 소아치과학교실, 구강과학연구소

Correspondence: Seong-Oh Kim, Tel: 02-2228-3171, Email: ksodds@yumc.yonsei.ac.kr

Abstract

Mandibular first molar and primary molars usually have two roots, on the mesial and distal sides. Occasionally, these molars have an extra root located in the distolingual aspect. Prevalence of the 3-rooted first permanent molar shows ethnic variation, ranging from about 3% in Caucasian to about 20% in Mongoloid group, which includes Chinese, Japanese, Eskimo, American and Canadian Indians. The frequency of the mandibular molar with three roots decreases in the order of the first permanent molar, the second primary molar, and the first primary molar. If the mandibular first or second primary molar has an additional distolingual root, the adjacent molars, including the first permanent molar, posterior to it also may have it. Coronal morphologic change can occur in the mandibular first primary molars with three roots: the crown had more triangular-shape compared to the one with two roots, possibly affected by the presence of additional distolingual root. Clinically, exact diagnosis and treatment should be taken with those teeth for pulp canal treatment, extraction, and SS Cr.

Key Words: Additional root, Mandibular primary molars, Mandibular first permanent molar, Coronal morphologic change, Mongoloid group