A STUDY OF OCCLUSAL CONTACT ON SUPERSTRUCTURES OF IMPLANT AND NATURAL TEETH

本研究旨在探讨种植体与天然牙支持的上部结构在加载条件下的咬合接触及咬合力。试验组由20名部分无牙颌患者组成，他们接受了种植体支持的固定部分修复体治疗。表面肌电活动记录从双边咬肌活动在最大紧握，和活动被定义为100%最大随意收缩（MVC）。在25%、50%、75%、100%MVC下，利用牙电测量仪测量咬合接触和咬合力，并在每个咬合水平下进行双侧咬肌活动的视觉反馈。咬合接触在每个咬合水平记录三次。为了评估咬合接触，分析以下因素：1.咬合力2.咬合接触面积3.咬合接触次数4.种植体/结果表明：1.种植体上部结构和天然牙上部结构的咬合力增加方式不同; 2.种植体支持的固定修复体的反应取决于种植体的大小，种植体所在的缺牙区的分类。

The purpose of this study was to investigate the occlusal contacts and force in superstructures supported by implant and natural teeth under loading condition. The testing group consisted of 20 partially edentulous patient who had been treated with fixed partial prostheses supported by implants. Surface EMG activity was recorded from bilateral masseter muscles activity at maximum clenching, and the activity was defined as 100% maximum voluntary contraction (MVC). Occlusal contacts and force were measured by dental prescale at 25%, 50%, 75%, 100%MVC.Each clenching level was performed with visual feedback of the bilateral masseter muscle activities. Occlusal contacts were recorded three times every clench level.To evaluate occluasl contacts, following factors were analyzed.1.ooclusal force2.area of occlusal contacts3.number of occlusal contacts4.implant/natural teeth supported force ratioThe following results were obtained.1.The occlusal force increased differently from the way in superstructures of implant and natural teeth.2.Response of fixed partial prostheses supported by implants was dependent on classification of the edentulous zone where the implants had been placed.