Abstract
The purpose of this study was to propose the image analysis of the retentive area in removable partial denture by personal computer instead of surveyor.1. The image through CCD TV camera was processed on personal computer to recognized the shadow as the undercut area on the abutment teeth in removable partial denture. The binary processed image was reversed and added to the original one. The threshold level of digital processing was determined by density histogram of primary colors.2. The lines drawn by Laplacian emphasis corresponded to survey lines.3. The light was directed toward perpendicular to occlusal plane of the cast by the reflection of the mirror. The path of placement and removal was alternated by changing the inclination of the mirror. The distribution of undercut area on abutment teeth could be found repeatedly at different angles and the retentive areas in common to mesial and distal directions could be found by image calculating.
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