Journal of the Korean Academy of Pediatric Dentistry 2013;40(3):149-158.
Published online August 31, 2013.
Three-Dimensional Evaluation of Impacted Mesiodens Using Dental Cone-Beam Computed Tomography in Korean Children and Adolescents
Sang-Duk Kim1, Sang-Ho Lee2, Nan-Young Lee2, Sang-Yun Jeon2
1Department of Dental Hygiene, Dong-A Injae University
2Department of Pediatric Dentistry, College of Dentistry, Chosun University 
치과용 cone beam CT를 이용한 한국인 소아 및 청소년의 매복 정중과잉치에 대한 3차원적 분석
김상덕1, 이상호2, 이난영2, 전상윤2
1동아인재대학교 치위생과
2조선대학교 치의학전문대학원 소아치과학교실 이
Correspondence:  Sang-Ho Lee,  Tel: +82-62-220-3860, Fax: +82-62-225-8240, Email:
Received: 2 April 2013   • Accepted: 1 August 2013
The purpose of this study was to evaluate the shape and impacted pattern of mesiodens and associated complications using three dimensional images produced by dental CBCT. This study was based on the CBCT (CB Mercury, Hitachi, Tokyo, Japan) radiographic view of 280 pediatric patients who visited the Department of Pediatric Dentistry at the Chosun University Dental Hospital with the chief complain of mesiodens during between 2007 and 2012. Impacted mesiodens occurs more frequently in boys than in girls, the ratio being approximately 3.3:1 and most cases were observed between 6 and 8 years of age. The number of mesiodens per patient was 1.38. Majority of the mesiodens were conical (79.5%) in shape and inverted (48.6%) in direction. The mesio-distal position of mesiodens were the most common in middle sector (81.8%), vertical level were the most common near cervical (60.3%), and labio-palatal position were the most common at palatal side of the dental arch (73.8%). 47.5% of mesiodens had complications and common complications associated with mesiodens were displaced tooth and delayed eruptions. The shape, vertical level, and labio-palatal position of mesiodens had correlations with complications. CBCT appears to be an excellent diagnostic tool, providing three dimensional information and accurate images, for diagnosis of impacted mesiodens.
Key Words: Tooth, Supernumerary, Diagnosis, Mesiodens, Cone-beam CT

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