Histomorphometric Evaluation of Cortical Bone Thickness Surrounding Miniscrew for Orthodontic Anchorage
Histomorphometric Evaluation of Cortical Bone Thickness Surrounding Miniscrew for Orthodontic Anchorage
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DOI：
10.1111/j.1708-8208.2009.00197.x
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发表时间：
2011-01-01
影响因子：
3.6
通讯作者：
Takano-Yamamoto, Teruko
中科院分区：
文献类型：
--
作者：
Deguchi, Toru;Yabuuchi, Toshinori;Takano-Yamamoto, Teruko
背景：近年来，使用微螺钉作为支抗已成为正畸领域的常规方法。然而，有没有报告说，分析了愈合过程中的miniscrews，如厚度的皮质骨，在prospect.Purpose：在本研究中，组织学评估的愈合过程中的骨组织周围的miniscrews用作正畸支抗，皮质骨的厚度的变化进行了分析后3，6和12周的位置。此外，在不同区域的微型螺钉在愈合初期的骨-种植体接触的变化也investigated.Materials和方法：96微型螺钉被放置在8只比格犬。愈合3、6和12周后，对施力组施加200-300 g的力，持续12周。非强制组保持在颌骨没有forceapplication.Results：在非强制组中，大量的皮质骨形成在头部的miniscrew在愈合过程的初始阶段，在上颌骨。然而，在下颌骨中观察到较少的皮质骨形成。施力后，与两个钳口的其他区域相比，在微螺钉1 mm内观察到骨形成增加。在下颌骨中，在施力后3周和6周观察到皮质骨明显减少。骨种植体接触显示，周围的骨组织成熟的miniscrews从顶点到头部的miniscrews.Conclusion：我们建议，这足够的皮质骨在愈合的初始阶段，使立即加载miniscrews抵抗正畸力。此外，在微螺钉头部形成的皮质骨量较少可能是下颌骨中较高失败率的原因之一。
Background: Recently, the use of miniscrews as an anchorage device has become a routine approach in the orthodontic field. However, there is no report that has analyzed the healing process of the miniscrew, such as the thickness of the cortical bone, in the past.Purpose: In the present study, to histologically assess the healing process of the osseous tissue surrounding miniscrews used as an orthodontic anchorage, the change in the thickness of the cortical bone was analyzed after 3, 6, and 12 weeks after the placement. Furthermore, the change in the bone-implant contact in different regions of the miniscrew during the initial healing period was also investigated.Materials and Methods: Ninety-six miniscrews were placed in eight beagle dogs. After 3, 6, and 12 weeks of healing, a force of 200-300 g was applied to the force-applied groups for 12 weeks. Non-forced groups remained in the jaw without force application.Results: In the non-forced groups, a significant amount of cortical bone was formed at the head of the miniscrew at the initial stage of the healing process in the maxilla. However, less cortical bone formation was observed in the mandible. After the force application, increased bone formation was observed within 1 mm of the miniscrew compared to other regions in both jaws. In the mandible, significantly less cortical bone was observed 3 and 6 weeks after the force application. Bone-implant contact revealed that the osseous tissue surrounding the miniscrew matured from the apex toward the head of the miniscrew.Conclusion: We suggest that this sufficient amount of cortical bone at the initial stage of healing enables the immediate loading in miniscrews to resist against orthodontic force. Furthermore, less amount of cortical bone formed at the head of the miniscrew may be one reason for the higher failure rate in the mandible.