Study of Occlusal Forces of Complete Dentures in Telemetry System

本研究的目的是开发六通道遥测系统来测量全口义齿佩戴者的咬合力，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用于校正传感器数据的标准电阻。来自6个负载传感器和标准电阻以及标准零点的数据采用分路多路通信方法进行多路传输。采样频率为666赫兹。并且该信号通过FM调制传输。载波频率为兆赫。使用起止系统对接收的数据进行解码。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进行校正。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公斤或更小的载荷，系统的总线性度保持在校准值的+/-4%。噪声级为300g。本研究采用该系统进行研究，结果如下：1.在工作侧，同侧人工第一磨牙下部受力最强，与前人报道的结果一致。在平衡侧，下部人工第二前磨牙的受力和冲量最大，其次是下部第一磨牙和第二磨牙。提示在咀嚼过程中，平衡侧较低的人工第二前磨牙有助于义齿的稳定。

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 .