Study of Occlusal Forces of Complete Dentures in Telemetry System

本研究的目的是研制六通道遥测系统，用于测量全口义齿患者的咬合力，并分析双侧平衡咬合的全口义齿在咀嚼过程中的咬合力。系统有6个负载传感器和一个标准电阻器用于校正传感器数据。来自6个负载传感器和标准电阻以及标准零点的数据使用分多路复用通信方法进行多路复用。采样频率为666 Hz。信号通过FM调制传输。载波频率为64 MHz。接收到的数据使用起止系统解码。在积分器处使用信号平均技术来降低波形噪声。数据通过A/D转换器输入计算机。在该系统中，传感器数据在计算机上用标准电阻数据校正。该方法可以显著降低电池功率变化和热漂移的影响。对于10 Kg或更低的负载，系统的总线性保持在校准值的+/-4%。噪音等级为300 g。本研究利用该系统进行了实验研究，结果如下：1.在工作侧，同侧人工后牙中，下颌第一磨牙的受力最大，与先前研究一致.在平衡侧，下颌人工第二前磨牙的力和冲量最大，其次是下颌人工第一磨牙和第二磨牙.结果表明，在咀嚼过程中，平衡侧的下人工第二前磨牙有助于义齿的稳定性。

The purpose of this study was to develop six-channels telemetry system for measuring occlusal force of complete denture wearers and to analyze the occlusal force of complete denture with bilateral balanced occlusion during mastication.This system is embedded in a lower complete denture. System has 6 load sensors and a standard resistor for correction sensor data. Data from 6 load sensors and standard resistor as well as standard zero are multiplexed using a division multiplex communication method. The sampling frequency is 666 Hz. And the signal is transmitted by FM modulation . The carrier wave frequency is 64 MHz. Received data are decoded using a start-stop system . The wave form noise is reduced using a signal averaging technique at an integrator. The data are input into the computer with an A/D converter. In this system, the sensor data is corrected at the computer with the standard resistor data. This method could reduce the influence of battery power changes and thermal drift significantly. For the load of 10 Kg or less, the total linearity of the system remained at +/- 4 % of the calibrated value. The noise level is 300g. This study was performed with this system.The results were as follows :1. On the working side, the lower artificial first molars showed the strongest force among the same side artificial posteriors, as previously reported.2. On the balancing side, the lower artificial second premolars showed the strongest force and impulse, followed in order by the lower artificial first molars and the second molars.3. It is suggested that the lower artificial second premolar of the balancing side would contribute to the denture stability during mastication .