[Basic study on pressure of supporting tissues under upper complete denture]

Through simulation method, the influences of occlusal force loading point, posterior pontics arrangement, palate thickness and denture base material on pressure distribution over supporting tissues under maxillary complete denture were studied. The results were the following: 1. Pressure distribution over supporting tissues showed remarkable variation according to the position of the occlusal force loading point. 2. Pressure on the buccal side of the alveolar ridge was greater in the buccally shifted arrangement of posterior pontics than in the standard and lingually shifted arrangements. 3. Reduced palate resin thickness below normal value increased pressure on the palate midline region. 4. For the standard and lingually shifted arrangements of posterior pontics, pressure on the incisor and palate midline regions is decreased in metal base compared to acrylic resin base. In the buccally shifted arrangement, pressure on buccal side of the alveolar ridge is lesser in metal base than in acrylic resin base.