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

我们以前的研究表明，当被检牙齿有一定的过早接触时，触诊过程中牙齿振动的幅度在200 Hz左右增长，当适当的指压（从50到150 gr）时，牙齿振动的最大幅度可能是一个新的客观评价咬合的参数。被应用。本研究的目的是证实新参数的可靠性的咬合评估。选择5名志愿者，测量其第11、21、13、23、14和24颗牙齿在下颌骨习惯性闭合运动时的振动。用多层铂箔分别模拟11、13和14号牙齿的人工过早接触。但对21号、23号和24号牙齿不进行人工过早接触，对每个对照牙齿11号、13号和14号进行测量。使用加速度计拾取器以约50 gr的手指压力测量牙齿振动。对齿面振动的各个波形进行FFT分析，计算出最大振幅及其峰值频率。结果如下：过早接触的牙齿的每个振动在最大振幅上显示出比每个控制牙齿的振动明显更高的值（学生t检验，p<0.01），并且所有峰值频率均在150至750 Hz范围内观察到（置信区间为99%）。然后，我们利用这些结果制作了一个新的咬合评估系统，该系统基于触诊时的牙齿振动

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