ERUPTION GUIDANCE OF IMPACTED MANDIBULAR FIRST MOLAR

Lee, Doo Young; Song, Je Seon; Lee, Jae-Ho Lee; Choi, Byung-Jai; Kim, Seong Oh

Journal of the Korean Academy of Pediatric Dentistry 2010;37(2):226-232.
Published online May 31, 2010.

ERUPTION GUIDANCE OF IMPACTED MANDIBULAR FIRST MOLAR

Doo Young Lee¹, Je Seon Song², Jae-Ho Lee Lee², Byung-Jai Choi², Seong Oh Kim²

¹Department of Pediatric Dentistry, College of Dentistry, Yonsei University
²Department of Pediatric Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University

매복된 하악 제1대구치의 맹출 유도

이두영¹, 송제선², 이제호², 최병재², 김성오²

¹연세대학교 치과대학 소아치과학교실
²연세대학교 치과대학 소아치과학교실 및 구강과학연구소

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

Received: 5 January 2010 • Accepted: 22 March 2010

Abstract

ncidence of tooth impaction varies from 5.6 to 18.8% of the population. Failure of eruption of the first and second permanent molars is rare; the prevalence in the normal population is 0.01% in case of the first permanent molar, and 0.06% in case of the second permanent molar. Permanent molars are particularly important for providing sufficient occlusal support and co-ordinating facial growth. Failure of eruption of permanent molars may result in various complications such as decrease in vertical dimension, posterior open bite, extrusion of antagonistic teeth, resorption and inclination of adjacent teeth, formation of cyst and so on. Treatment options of impacted teeth are periodic observation, surgical exposure, surgical exposure with subluxation, orthodontic relocation, and surgical extraction before prosthetic treatment. Early diagnosis and treatment are important, because delayed treatment induces various problems such as decreased spontaneous eruptive force, decreased successful percentage, increased treatment period, increased various complications. Prevalence of the failure of mandibular first molars is rare but eruptive guidance before extraction of impacted teeth is necessary due to importance of permanent molars. We reported two cases of surgical exposure of impacted mandibular first molar. In these cases, we could observe different result of the impacted mandibular first molar after surgical exposure.

Key Words: Mandibular first molar, Failure of eruption, Surgical exposure, Spontaneous eruption