Effect of inadequate fits of superstructures on surrounding tissue

上部结构不合适对周围组织的影响

• 批准号: 09672004
• 负责人: YAMAMORI Tetsuo
• 金额: $ 2.05万
• 依托单位: Ohu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09672004/
• 关键词: Dental implant; Superstructure; Fit

Bilateral mandibular fourth premolars and first molars from 2 beagle dogs were extracted, and 3 fixtures for each site were inserted 3 months later. Abutments were connected on each fixture 4 months after insertion of the fixture, followed by impression taking. A connected superstructure was set on 3 abutments in each side of mandible and gold screws were tightened with a torque of 10 Ncm. Superstructures were passively fit to the abutments expect for the middle ones of the experimental side, which were given vertical clearance of about 140〜200 μ m between the superstructures and abutments.The tissue blocks including the implants sampled after 5 or 14-week observation were used for the histological examination. Histological findings from both the fit and the misfit groups resembled to each other, and large percentage of the fixture surface directly faced to the bone tissue. In both fit and misfit groups, standardized rentogenographs showed no obvious change in the bone height around the fixtures.For the finite element analysis, the simplified model was created at first. Then the model with reference to the bucco-lingual section of the tissue blocks was made.

提取了两只小猎犬犬的双侧下颌第四次预赛和第一颗磨牙，并在3个月后插入了每个部位的3个固定装置。插入固定装置后4个月，在每个固定装置上连接基台，然后留下印象。在下颌骨的每一侧设置了3个基台，并用10 ncm的扭矩拧紧了连接的上层建筑。上层结构被动地适合实验侧的中间的基台，在上层建筑和基台之间给出了大约140-200μm的垂直清除。组织块包括在5或14周观察后进行的简化，用于组织学检查。拟合和贴身组的组织学发现相似，彼此类似，很大一部分的固定液表面直接面对骨组织。在拟合和贴身组组中，标准化的伦理仪都没有显示固定装置周围骨高度的明显变化。对于有限元分析，最初创建了简化的模型。然后，提到了组织块的Bucco-语言部分。