Experimental Study on the Tooth Bud in Area of Distraction Osteogenesis.

概要

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The purpose of this study was to observe he developing tooth in the area of distraction osteogenesis of the mandible. Five healthy mongrel male dogs with deciduous dentition were used as the experimental subjects. A corticotomy was carefully made around a tooth bud of the permanent first molar. Then the external distractor (Orthofix M-100 (<SUP>®</SUP>)) was connected by four screws installed across the corticotomy site. After 10 days for healing of the periosteum, distraction was performed at rate of 0.75mm per day for 10 consecutive days to elongate 7.5mm, and the mandible was held by external fixation to allow ossification of the expanded segment. Then clinical, radiographic, and histological evaluations were performed. As distraction began, the space between the wall of the follicle and the bone expanded. Initially, the open end of the growing root became wider than that of the contralateral first mandibular molar and wavy, and lastly, the apex closed. As a result, the root shape became irregularly, but the first molars erupted normally.
特定非営利活動法人日本口腔科学会の論文