Study of Denture Foundation with B-mode Ultrasonic Equipment - Development Measuring System for Occlusal Load and Thickness of Denture Foundation -

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The purpose of this study was to develop the image processing system, which allows to measure the thickness of the denture foundation and the occlusal force. Using this system, we investigated the compressibility of the denture foundation and to determine the amount of relief in thickness over the specific area.In this report, the mucosal thickness of 60 complete denture wearers were measured with 20 MHz B-Mode Ultrasonic Diagnostic Equipment, under both non occlusal load and maximum occlusal force. Moreover, the mucosal thickness of 15 complete denture wearers whose dentures were relieved by 0.25, 0.50, 0.75, 1.00mm over the areas of incisive papilla, torus palatinus and median palatine suture were also measured by the same manner.The main results were as follows :1. The thickness of the denture foundation could be measured at the accuracy of 0.1mm in the system.2. Decrease in the mucosal thickness under maximum occlusal force was about 0.3mm in averages.3. Decreasing rate in the mucosal thickness under maximum occlsal force was greater in a mandible than in a maxilla.4. Judging from the decrease in the mucosal thickness by relief procedures, it was found that 0.50mm relief in thickness was necessary in a case of severe torus palatinus and 0.20-0.50mm relief in a moderate one.5. Even in a case without the existence of torus palatinus, about 0.25mm relief in thickness was desirable over the incisive papilla and median palatine suture areas.