A Study on Time-Dependent Tooth Displacements by Percussion and the Functional Properties of Periodonteum

冲击引起的随时间变化的牙齿位移和牙周膜功能特性的研究

• 批准号: 03670926
• 负责人: SASAHARA Hiroshige
• 金额: $ 1.15万
• 依托单位: NIHON UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03670926/
• 关键词: percussion; percussion device; tooth displacement; accelero meter; computer; objective valuation; 衝撃打診; 加速度; 打診力

We studied the reproducibility of percussion on the simulator model, using T-type and straight impulse hammers as percussion devices. In addition, to develop a displacement measuring system for teeth, we performed percussion on the simulator model using an accelerometer and a laser displacement meter and measured displacements at the same time. As a result:Compared with the T-type impulse hammer, the straight impulse hammer had higher reproducibility in percussion impulse and maximum acceleration, and provided smaller differences among operators.There was a strong positive correlation between the level obtained from acceleration and level obtained by the laser displacement meter.Next, we measured the displacement of maxillary right central incisors of three dentally normal persons and one dentally abnormal person. As a result:Displacements were smaller in the dentally normal persons.There was a strong positive correlation between impulse and displacement both in dentally normal and ab-normal persons.Dentally normal persons showed a smaller increase in displacement than in impulse.The maximum displacement time was shorter in dentally normal persons than in dentally abnormal persons.

我们在模拟器模型上研究了冲击的再现性，使用T型和直脉冲锤作为冲击装置。此外，为了开发牙齿位移测量系统，我们使用加速度计和激光位移计对模拟器模型进行敲击，同时测量位移。结果：与T型冲击锤相比，直型冲击锤的冲击冲量和最大加速度的再现性更好，操作者之间的差异更小，加速度测量值与激光位移计测量值之间存在很强的正相关性。结果表明：牙齿正常人的位移量较小，牙齿正常人和牙齿异常人的冲量与位移量均呈强正相关，牙齿正常人的位移增量小于冲量增量，牙齿正常人的最大位移时间短于牙齿异常人。