Journal of the Korean Academy of Pediatric Dentistry 2010;37(2):246-251.
Published online May 31, 2010.
ORTHODONTIC TREATMENT OF AN IMPACTED MANDIBULAR FIRST MOLAR USING MINIPLATE AS A SKELETAL ANCHORAGE: A CASE REPORT
Yoon Hyoung Jang1, Eun Young Kim1, Kwang Chul Kim1, Jae Hong Park1, Baek Soo Lee2, Sung Chul Choi1
1Department of Pediatric Dentistry, School of Dentistry, Kyung-Hee University
2Department of Oral & Maxillofacial Surgery, School of Dentistry, Kyung-Hee University 
Miniplate를 골격성 고정원으로 이용한 매복된 하악 제1대구치의 교정치료 증례
장윤형1, 김은영1, 김광철1, 박재홍1, 이백수2, 최성철1
1경희대학교 치의학전문대학원 소아치과학교실
2경희대학교 치의학전문대학원 구강악안면외과학교실
Correspondence:  Sung Chul Choi,  Tel: 02-958-9373, Email: pedochoi@khu.ac.kr
Received: 25 November 2009   • Accepted: 23 February 2010
Abstract
Impactions can occur because of malpositioning of the tooth bud or obstruction in the path of eruption. However, the exact mechanism is still unknown. The impaction of mandibular first molar is rare with prevalence rates of 0.01~0.25%, but it is important to deimpact the tooth as soon as possible to avoid complications such as dental caries, root resorption, and periodontal problems on the adjacent teeth. Several biomechanical strategies have been proposed for uprighting mesially tipped mandibular first molars. However, most of these have had problems with movement of the anchorage unit because of the reciprocal force. The recent development of skeletal anchorage system(SAS) allows direct application of precise force systems to the target tooth or segment, producing efficient tooth movement in a short time. In this case, an impacted mandibular left first molar with dilacerated roots was treated with a miniplate, which provided skeletal anchorage to upright the tooth. The miniplate was installed in the mandibular ramus, and 10 months after the application of orthodontic force, the impacted tooth was exposed in the oral cavity and uprighted. At this point, the mandibular left first molar was included in the orthodontic appliance with fixed mechanotherapy, the tooth could achieve a normal occlusion. Therefore, the use of SAS simplified the orthodontic procedures and reduced the orthodontic treatment period, and had few side effects.
Key Words: Impaction, Mandibular first molar, Skeletal anchorage, Miniplate


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