Journal of the Korean Academy of Pediatric Dentistry 2008;35(2):268-277.
Published online May 31, 2008.
A STUDY ON THE FEATURES OF MESIODENS AND THE RESOLUTION RATE OF COMPLICATIONS AFTER THE EXTRACTION OF MESIODENS
Eun-Min Jun, Tae-Wan Kim, Hyun-Jung Kim, Soon-Hyeun Nam, Young-Jin Kim
Department of Pediatric Dentistry, College of Dentistry, Kyungpook National University 
상악 정중부 과잉치의 양상과 발거 후 병발증 치유율에 관한 연구
전은민, 김태완, 김현정, 남순현, 김영진
경북대학교 치과대학 소아치과학교실
Correspondence:  Young-Jin Kim,  Tel: 053-420-5961, Email: yjikim@mail.knu.ac.kr
Abstract
Authors evaluated 1171 patients at the department of Pediatric Dentistry in Kyoungpook National University Hospital through clinical records and radiographs. And the following features were studied ; age, sex distribution, number of mesiodens per patients, cause of discovery of mesiodens, location, status of eruption, shape and orientation of crown, complication, dental age of adjacent upper incisor tooth at the time of surgical extraction of mesiodens and the relationship between the resolution rate of complication after extraction of mesiodens and the dental age of adjacent upper incisor tooth, length of diastema, the eruption status of lateral incisor and the crowding status of premaxilla. The followings are the results : 1. The cause of discovery of mesiodens were as follows ; delayed eruption of the permanent incisors in 13.8%, midline diastema in 11.6%, radiographs taken for other reasons in 23.4% and for caries treatment in 15.1%. 2. Complication due to the presence of mesiodens did not occur in 36.8%, delayed eruption of adjacent teeth was observed in 16.1%, midline diastema in 34.4%, rotation in 8.8%, displacement in 2.4%, and crowding in 1.0% of all evaluated patients. 3. As for the dental age of adjacent upper incisor tooth at the time of surgical extraction of mesiodens, below 1/3 of total root length were observed in 3.5%, 1/3~1/2 of total root length in 19.9%, 1/2~2/3 of total root length in 54.7% and over 2/3 in 21.9% of all evaluated patients. 4. Resolution rate of delayed eruption after the extraction of mesiodens was significant higher in the group with the root length below 1/2. Resolution rate of midline diastema was significant higher in the group with diastema width below 3mm and with non-crowding of adjacent upper incisor teeth.
Key Words: Mesiodens, Delayed eruption, Midline diastema, Resolution rate


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