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

骨缺损患者为了恢复咀嚼和言语功能，必须戴义齿修复。骨缺损患者的局部义齿可以通过使用机械装置（如卡环）来实现局部义齿的固位。一般来说，提供局部义齿可以通过防止不必要的牙齿移动等对口腔健康做出积极的贡献。但在临床上很难确定每一种情况下如何设计局部义齿，本研究的目的是探讨骨缺损患者戴用局部义齿对残余组织的影响。通过<TM>对33颗基牙在初始安装后1年内的牙周活动度（PT）值的测定，评价了这种方法对牙齿活动度的影响。义齿初戴时，30%的基牙PT值小于9.9，70%的基牙PT值大于10.0。戴入义齿后1个月内，PT值上下波动，但1个月后PT值基本不变. 1年后，50%基牙的PT值增加，50%基牙无变化。

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.