PVDF动态力测试仪的研制及应用

Development of polyvinylidene fluoride-based instrument for dynamic bite force measurement

目的 :研制出适用于测量单个天然牙动态牙合力的测试仪 ,并进行标定及临床初步应用。方法 :以PVDF压电薄膜为传感元件 ,采用电荷放大器、低通滤波、二级放大技术 ,建立与传感器相配套的动态牙合力的采集及处理系统 ,用MTS 85 8双向加载材料试验系统进行标定 ,并用其对侧牙合运动中正常牙动态牙合力的变化情况进行了测试研究。结论 :仪器性能稳定 ,灵敏度高 ,重复性好 ,数据可靠 ,测试结果满意。

Objective: To develop a polyvinylidene fluoride (PVDF)-based instrument which may be used to measure bite force in natural teeth as well as in denture. Methods: The PVDF film was used as transducer. Electricity amplifier, lowpass filter, secondary magnifier in metrical circuit, and collection with disposal system were employed to produce the instrument for bite force measurement. The demarcating system was MTS-858. The instrument was used to measure the dynamic force in laterotrusion in 9 volunteers with Angle I occlusion. Results: The instrument was produced.By the used of the instrument the peak value of bite force (N) in the 9 subjects was 277.3±78.4 on the main functional side (MFS) and 258.7±83.3 on the subfunctional side (SFS).The time(ms) needed in the four phases on MFS was 65.6±7.3,354.4±66.1,116.3±25.0 and 226.9±35.8;that on SFS 67.5±6.6,394.4±65.3,141.9±25.6 and 167.5±41.9,respectively.Conclusion: The new system is steady and sensitive for bite force measurement.