Fundamental Studies on Functional Pressures and Stress-Bearing. II-1. Application of Poly-vinylidene Fluoride Film for Simulation Model of Upper Maxillas.

In conservation of basal seat under denture, it is important to know the intensity and distribution of pressures on alveolar mucosa and alveolar bone.Using a simulation model of upper maxillas and poly-vinylidene fluoride film (PVDF) having piezoelectricity, we investigated how pressures on basal seat under denture are affected by load on artificial teeth. Strain in denture base was also considered.The results were following:The quantity of strain was greater on palatal side or palate than on buccal side or ridge. The direction of strain was inner on buccal side and ridge and outer on palatal side and palate.When the distribution of pressure on alveolar mucosa and on alveolar bone was examined, pressure level was found to be greatest on ridge, followed by palatal side, buccal side and palate at a given load amount.The peak of output voltage first appeared at strained part of denture base, followed by alveolar bone and alveolar mucosa in order.These results indicate that PVDF is useful for determining the condition of strain in denture base and pressures on alveolar mucosa and alveolar bone.