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유성견에서 periodontal distraction에 의한 급속 치아견인 시 치수 및 치주조직의 변화에 관한 연구

Pulp and periodontal tissue changes following rapid tooth retraction by periodontal distraction in young adult dogs

김상철|채종문|홍현실|이종진
대한치과교정학회 (The Korean Association Of Orthodontists)|2007.10|대한치과교정학회지 (The Korean Journal of Orthodontics)|제37권 제5호|pp. 351-363

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키워드

골재형성Periodontal distractionBone remodelling
주제분류치의학

초록

유성견에서 periodontal distraction 과정을 통해 급속 견인 후에 치수와 치주조직의 변화를 평가하였다. 유성견의 상악 제2소구치를 발거하고 제3소구치 근심의 치간골을 부분 제거하였다. 견인장치는 6일 동안 하루에 2번씩 견인하고, 강화기 동안 0주, 1주, 3주, 5주, 7주, 9주에 치수와 치주조직의 변화를 임상적, 방사선학적, 조직학적, 면역조직화화학적으로 관찰하였다. 신장된 치주인대 내에서 견인 직후부터 4주까지 활발한 골밀도 증가를 보였으며, 특히 2-3주 사이에서 가장 활발하였다. 강화기 0주에 압박측 치조골의 흡수 및 파골세포 출현, 염증세포 침윤이 가장 많이 관찰되었고 1주의 신장측 치주인대에서 특징적인 골형성을 보이기 시작하였다. 신생골 형성은 1주와 3주에 가장 많이 관찰되었으며 9주에는 성숙골로의 대치 및 치주인대의 재생으로 대조군과 차이가 없었다. 실험군의 calcitonin gene-related peptide의 발현은 치수, 치주인대 내의 염증 부위에서 나타났으며 0주, 1주에 압박측 치주인대에서 증가하였다가 5주 이후에는 감소하여 대조군과 차이가 없었다. 이상과 같은 소견은 periodontal distraction에 의한 급속 치아 이동이 정상적인 골 재형성 과정을 도모하는 새로운 치아이동 방법이 될 수 있음을 시사한다. (대치교정지 2007;37(5):351-63)

Abstract

Objective: The aim of this study was to evaluate pulp and periodontal changes following rapid tooth retraction by periodontal distraction after bone undermining surgery in young adult dogs. Methods: After extraction of second premolars, the interseptal bone mesial to the upper 3rd premolar was undermined. After activating the distraction appliance at 0.5 mm/day for six days, the dogs were sacrificed at 0, 1, 3, 5, 7, and 9 weeks during the consolidation period. Tissue changes of periodontium and pulp were evaluated radiologically, histologically, and immunohistochemically. Results: Digital subtraction radiography showed active bone formation in the stretched periodontal ligament from 0 - 4 weeks. Resorption of the alveolar bone, appearance of osteoclasts, and infiltration of inflammatory cells were observed just after the activation period at the pressure side, and distinctive bone formation was seen in the tension side of the periodontal ligament from 1 week. New bone formation was active at 1 - 3 weeks. The expression of calcitonin gene-related peptide in the experimental group was increased at the alveolar bone and pulp, and periodontal ligament at the pressure side from 0 - 1 week, and it decreased after 5 weeks to become similar to that of the control group. Conclusions: The results showed that rapid tooth movement using periodontal distraction can be new form of orthodontic tooth movement for accelerating normal bone formation. (Korean J Orthod 2007;37(5):351-63)

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