Development of new occlusal evaluation system based on peculiarity of tooth vibration during palpation.

我们以前的研究表明，当被触诊的牙齿过早接触时，牙齿在触诊过程中的振动幅度在200 Hz左右增大，当手指压力合适时(从50到150gr)，牙齿振动的最大幅度可能是一个新的客观隐匿性评价参数。被应用了。本研究的目的是确认新的咬合评价参数的可靠性。以5名志愿者为研究对象，测量了他们的11、21、13、23、14和24颗牙齿在下颌骨习惯性闭合运动过程中的牙体振动。用多层铂箔分别模拟人工过早接触11、13和14号牙齿。但对21、23、24号牙不进行人工过早接触，分别对11、13、14号对照牙进行测量。使用加速度计传感器测量牙体振动，手指压力约为50g。对牙齿振动的每一种波形进行FFT分析，计算出最大幅值及其峰值频率。结果表明：早期接触的牙齿的每一次振动的最大幅值都显著高于每颗对照牙齿的振动(学生t检验，p&lt；0.01)，并且所有的峰值频率都在150-750赫兹(置信度为99%)的范围内。然后我们根据这些结果制作了一个基于触诊过程中牙齿振动的咬合评价系统

Our previous studies indicated that the tooth vibration during palpation showed a growing amplitude around 200 Hz when the palpated tooth had some premature contact, and that the maximum amplitude of tooth vibration might be a new parameter for an objective occulusal evaluation when a suitable finger pressure (from 50 to 150 gr.) was applied. The purpose of this study was to confirm the reliability of the new parameter for occlusal evaluation. Five volunteers were used and each tooth vibration of their #11,21,13,23,14 and 24 teeth was measured during habitual closing movement of the mandible. Artificial premature contact to teeth #11,13 and 14 was simulated individually by a multiple-thickness platinum foil. But no artificial premature contact was given to teeth #21,23 and 24, which was measured for each control tooth #11,13 and 14. The accelerometer pick-ups were used to measure the tooth vibration with about 50 gr.finger pressure. FFT analysis was applied to each wave form of tooth vibration, and then the maximum amplitude and its peak frequency were calculated. The results were as follows : each vibration of the teeth given premature contact showed a significantly higher value in the maximum amplitude than the vibration of each control tooth (Student's t-Test, p<0.01) and also all of the peak frequencies were observed in the range of 150 to 750 Hz (Confidence Interval at the 99%).Then we manufactured a new occlusal evaluation system using these results based upon tooth vibration during palpation