医学
颞下颌关节
髁突
骨吸收
抗压强度
吸收
牙科
口腔正畸科
材料科学
病理
内科学
复合材料
作者
Shinnosuke Nogami,Kensuke Yamauchi,Yoshinaka Shimizu,Bunichi Hirayama,Akira Kumasaka,Masahiro Iikubo,Hiroyuki Kumamoto,Tsuneo Takahashi
出处
期刊:Oral Diseases
[Wiley]
日期:2017-03-30
卷期号:23 (5): 644-652
被引量:6
摘要
Objective We experimentally compared the effects of compressive and tractional mechanical stress on the temporomandibular joint ( TMJ ) of rabbits to assess the etiology of progressive condylar resorption. Materials and Methods We performed a cortical osteotomy using custom‐made devices that were lengthened by 0.25 mm every 12 h for 1 week after surgery. During this time, the rabbit TMJ was under compressive or tractional mechanical stress. The samples in each group were examined using micro‐computed tomography and histological staining. Results Scores for the area of bone resorption were higher in the compressive group than in the tractional group. Moreover, scores for the depth of bone resorption were higher in the compressive group than those in the tractional group. We observed a significantly higher prevalence of resorption in the subcondylar bone in the compressive group than in the tractional group. There were substantially more cells that were positive for tartrate‐resistant acid phosphatase in the compressive group than in the control and tractional groups. Conclusions The outcomes here suggest that excessive mechanical stress, particularly compressive mechanical stress, may significantly affect morphological bone change findings in the TMJ .
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