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Development of the tooth preparation system with low noize and facility to support die preparation

开发低噪音、支持模具准备的牙齿预备系统

基本信息

批准号：
07457470
负责人：
SOHMURA Taiji
金额：
$ 3.97万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07457470/
关键词：
airturbine noise analyzes noise reduction tooth cutting die preparation 騒音低域

项目摘要

A conventional dental airturbine handpiece emits so uncomfortable high frequency noise that it is one of the hindrances for the dental treatment. The noise originates from the turbine with high revolution such as 300,000 to 500,000 rpm. While, at present, die preparation is completely carried out manually by a dentist, and it is difficult to master the technique especially for dental students. In the present study, we aimed the development of the tooth preparation system with low noise and facility to support die preparation.In order to reduce the high frequency noise, the spectrum analyzes of the noise emitted from the turbine was initially carried out, and some groups of noises which increase the frequency with the revolution was detected, for instance, noise with frequencies of 7.5 15.0 22.5kHz were detected in the 450,000 rpm. It was found that they were leaked from the upper and lower clearances in the turbine head and causes the noise. Then, shilding and adjusting in the clearance were done, and it was quite effective to reduce the noise.In the case of die preparation, a support jig with link mechanism which has fix point in the mouth was assembled. Two supervising dentists with career of two years and more than ten years respectively prepared upper and lower resin model molar teeth using this mechanism, and the taper angle and axis parallelity in the prepared die were examined. This mechanism was helpful for the correct preparation, and the prepared taper angles were reduced to about 10ﾟ-14ﾟ, and tils angle between the axs was within 2ﾟ, and their standard deviations also decreased.A student in the faculty of dentistry who has no experience attempted to train the preparation using this mechanism, and it was also helpful and he obtained marked progress in the technique.

传统的牙科涡轮机手机发出的高频噪声非常令人不舒服，是牙科治疗的障碍之一。噪声来源于诸如300，000至500，000 rpm的高转速的涡轮机。然而，目前，模具准备完全由牙医手动进行，并且特别是对于牙科学生来说，很难掌握该技术。本研究以开发低噪声、便于模具准备的齿轮准备系统为目标，针对涡轮机的高频噪声进行了初步的频谱分析，发现了几组随转速增加频率增加的噪声，如：在450，000 rpm下检测到频率为7.5、15.0、22.5kHz的噪声。发现它们从涡轮机头部的上、下间隙中泄漏，并引起噪声。在模具准备过程中，装配了一种在口部有固定点的连杆机构支撑夹具。由2名工作年限为2年和10年以上的指导医师分别用该机构制作上、下磨牙树脂模型，并对模具的锥角和轴线平行度进行检测。结果表明，该机构能有效地提高牙体预备的准确性，使牙体预备的锥角减小到10 ° ~ 14 °，轴间夹角在2 °以内，标准差也减小了，一名没有经验的口腔系学生尝试使用该机构进行牙体预备训练，取得了显著的效果。