The Research In Measuring Instrument Of Brixism-bite Force Networked

The clinical research shows that the bite force is the one of important sign of the chew muscle and the jaw system. It will be help us to know the function condition of jaw system and reference for the diagnosis of various diseases by measuring the bite force. the bite force also be used in appraise of the recovery condition in surgical operation,disorder in jaw arthritis and the serious bone offset in bite lopsided etc. However, at present, the cause of bruxism is not clear, and its diagnostic methods have not yet form a unified standard. Thereby, to develop a measuring instruments with features of easy to carry and precisely recording the molar disease symptoms of patients has an important economic value and use value.The theoretical basis of PVDF film producing piezoelectricity sensor installed in occlusal splint is firstly expounded in this thesis. And then the sensor is designed and produced by using the principle of a larger longitudinal piezoelectric effect of PVDF film in the thickness direction. And based on ZigBee protocol and its applications in wireless network sensor, and the combination of ZigBee wireless network sensor technology and the production of PVDF film producing piezoelectricity sensor installed in occlusal splint techniques, the solutions of the bruxism bite force measurement system networking is given. Because of the characteristics of high sensitivity of PVDF film, pre-charge amplifier and signal conditioning circuit design and its implementation is mainly analyzed in this thesis. In the signal acquisition and processing, the main sources of noise in the system are analyzed and the hardware and software solutions are made up. As a result of using many filtering and shielding treatment and enhancing the quality and strength of the signal, the requirement of speed and accuracy is satisfied in this system. Finally, the performance test and error analysis of the entire system designed in this thesis is done. And the actual experiments are also done. In actual measuring experiment, the measuring instrument can show the curve of the bite force, display the biggest and average value in one bite. At the same time, the measuring instrument is very convenient and has fast measuring speed which fulfills the anticipative idea of the research.