Journal of the Korean Academy of Pediatric Dentistry 2013;40(3):203-208.
Published online August 31, 2013.
Supernumerary Teeth in Monozygotic Twins
Sohyun Kim, Young-Jin Kim, Hyun-Jung Kim, Soon-Hyeun Nam
Department of Pediatric Dentistry, School of Dentistry, Kyungpook National University 
일란성 쌍생아들에서 관찰된 과잉치
김소현, 김영진, 김현정, 남순현
경북대학교 치의학전문대학원 소아치과학교실
Correspondence:  Soon-Hyeun Nam,  Tel: +82-53-600-7211, Fax: +82-53-426-6608, Email:
Received: 18 January 2013   • Accepted: 24 July 2013
Although the first case of supernumerary teeth had been documented almost 20 centuries ago, the etiology of supernumerary teeth still remains unclear. The prevalence of supernumerary teeth in the general Asian population is between 2.7% and 3.4%. The pathogenesis of supernumerary teeth has been attributed to phylogenetic reversion(atavism), splitting of the tooth bud(dichotomy theory), locally induced hyperactivity of the dental lamina and a combination of genetic and environmental factors(unified etiologic explanation). This report describes 3 cases of monozygotic twins with mesiodens who visited the pediatric dental clinic of Kyungpook national university hospital, and this is significant to support genetic factors involoved in the development of supernumerary teeth.
Key Words: Supernumerary teeth, Genetic factor, Monozygotic twin
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