Résumé
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.