EFFECT OF PRIMARY DOUBLE TEETH ON THE DEVELOPMENT OF PERMANENT SUCCESSORS

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Journal of the Korean Academy of Pediatric Dentistry 2004;31(2):136-143.
Published online May 31, 2004.

EFFECT OF PRIMARY DOUBLE TEETH ON THE DEVELOPMENT OF PERMANENT SUCCESSORS

유치의 이중치와 계승영구치의 발육에 관한 연구

라지영, 김대업, 이광희

원광대학교 치과대학 소아치과학교실.원광치의학연구소

Correspondence: ,

Abstract

The purpose of this study was to investigate the relationship between morphology and position of deciduous double teeth, and the occurrence of other dental anomalies in the same subject. Four morphological types were indentified according to Ailing's classification: type I, bifid crown-single root; type II, large crown-large root; type III, two fused crowns-single root; type IV, two fused crowns-two fused roots. Fifty-four double teeth were found in a total of 1,803 children, who had visited Wonkwang university hospital for dental treatment from January 1, 2003 to September 30, 2003. All of these children were examined clinically and intra-oral radiographs were taken. The results were as follows; 1. 49 children(2.7%) had more than one double teeth, 5 of these children had two double teeth on the bilateral side. And one child showed triple teeth which has three crowns and three roots. 2. Double teeth were predominantly situated in the anterior region, with a preference for the mandible. The ratio of cases involving central incisor and lateral incisor was higher than other cases. 3. There were 25 cases(46.2%) of missing successors among 54 cases of the double teeth. And, prevalence of the missing teeth was highest in the cases involving maxillary central incisor and lateral incisor. 4. In the case of type II(large crown-large root) had more missing successors.

Key Words: Deciduous double teeth, Permanent missing teeth, Fusion