The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Effects on Osteoclast in Periodontal Ligament Space by Denerveation of Inferior Alveolar Nerve in Young and Adult Rats

하치조 신경 절단이 치주인대공간에서 파골세포에 미치는 영향

  • 박경덕 (미치과의원) ;
  • 성재현 (성재현 치과) ;
  • 배용철 (경북대학교 치과대학 구강해부학교실) ;
  • 경희문 (경북대학교 치과대학 교정학교실)
  • Published : 2004.12.01
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Abstract

Osteoclast action is necessary for alveolar bone remodeling in orthodontic tooth movement. The nervous system has also been reported to be associated with bone remodeling. This study was aimed to investigate the changes of osteoclasts in the periodontal ligament (PDL) space after surgical resection of the inferior alveolar nerve (IAN). Experimental rats were divided into young and adult groups. A surgical resection procedure of the IAN was carried out in the left side of the mandible and a sham operation in the right side of the mandible. The number of osteoclasts on the bundle bone surface and the resorption activity of the osteoclasts were histomorphometrically measured. The changes in distribution of substance P (SP) immunoreactive (IR) nerve fiber were evaluated in the PDL and pulp. SP-IR nerve fiber was depleted in both the PDL and pulp of the IAN resection side in both groups, which confirmed the resection of IAN to be successfully conducted. The number of osteoclasts in the IAN resection side was significantly reduced in both the young and adult groups (p<0.01 and p<0.05), whereas the resorption activity of osteoclasts did not show any significant difference between the IAN resection side and the sham operation side in both groups (p>0.05 and p<0.05). The adult group showed that the number of osteoclasts reduced significantly (p<0.01) and the resorption activity didn't change in comparison with the young group (p>0.05). These results suggest that surgical resection of the IAN and aging reduce the population of the recruited osteoclasts within the PDL, but don't affect on the osteoclastic resorption activity.

본 연구는 하치조신경의 수술적 절단이 치주인대공간에서의 파골세포에 미치는 영향을 평가하기 위하여 시행하였다. 이를 위하여 실험동물을 젊은 쥐 군 과 성 쥐 군으로 구분하여 좌측 하악골에는 하치조신경절단을 시행하여 실험측으로, 우측하악골은 가수술측으로 사용하였다. Bundle 골 표면에 위치한 파골세포의 수 그리고 파골세포의 골 흡수 활성도를 조직 형태적으로 측정하였다. 또한 Substance P 면역반응 신경섬유의 분포 변화를 치주인대와 치 수조직에서 평가하였다. Substance P 면역반응 신경섬유는 양군 실험측에서 고갈됨으로서 하치조신경의 수술적 절단이 성공적이었다는 것을 확인 할 수 있었다 실험측에서 파골세포의 수가 젊은 쥐 군 과 성 쥐 군 모두에서 유의하게 감소하였다(p<0.01과 p<0.05). 그러나 파골세포의 골 흡수 활성도는 양군 모두에서 실험측과 가수술측 사이에 차이를 나타내지 않았다(P>0.05). 성 쥐 군에서 파골세포의 수가 젊은 쥐 군에 비해 유의하게 감소되었으며 (p<0.01), 파골세포의 골 흡수 활성도에서는 변화가 없었다(p>0.05). 이들 결과를 통하여 감각신경인 하치조신경의 절단과 연령증가는 치주인대 공간에서 Bundle골 표면의 파골세포의 수를 감소시켰으며 골 흡수 활성도에는 영향을 주지 않는 것으로 나타났다.

Keywords

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