A study of changes of abutment tooth mobility of jaw defect patients after wearing a prostheses

骨缺损患者必须配戴假牙以恢复咀嚼和言语功能。骨缺损患者局部义齿的固位可以采用卡环等机械手段来实现。一般来说，提供局部义齿可以通过防止牙齿不良运动等对口腔健康做出积极贡献。但是对于每一种情况，如何设计局部义齿是很难确定的。本研究旨在探讨骨缺损患者配戴局部义齿对剩余组织的影响。通过33颗基牙首次植入后1年内的Periotest^<TM> (PT)值来评估其对牙活动度的影响。实验结果如下：1.实验结果表明：初插义齿时，30%的基牙PT值小于9.9,70%的基牙PT值大于10.0.2。2 .初戴义齿后1个月内，PT值上下波动，但1个月后PT值基本一致。1年后，50%的基牙的PT值升高，50%的基牙没有变化。

Bone defect patients are necessary to wear dentures for recovering mastication and speech function. A partial prostheses for bone defect patients retention of partial denture can be achieved by using mechanical means such as clasps.Generally, the provision of a partial denture can make a positive contribution to the oral health by preventing undersirable tooth movements, etc.. But it is difficult to decided on make how to design a partial denture in every case.The purpose of this study was to investigate the influence on remaining tissue by wearing partial denture for bone defect patients. It was evaluated this changes tooth mobility by the Periotest^<TM> (PT) value of 33 abutment teeth within 1 year after initial insertion.The results were as follows :1. When initial insertion of dentures, PT value in 30% of abutment teeth were less than 9.9 and in 70% abutment teeth were above 10.0.2. During 1 month after initial insertion of dentures, PT value were fluctuating up and down but pass 1 month PT value were almost the same.3. After 1 year, PT value of 50% of abutment teeth increased and 50% of abutment teeth had no change.