Abstract
The purpose of this study was to investigate the designs of the individual tray for the impression of the flabby tissue, using the improved simulation model with silicon rubber mucosa.9 kinds of tray designs were prepared by the number of escape hole of 2.5mm in diameter (0, 26, 52 pieces) and the thickness of spacer (1.5, 3.0, 4.5mm).The impressions were made with the polysurfide rubber, by the same impression method used for the universal test machine in the previous study, under 3 conditions of tray inclination which meant the settling directions of impression (anteriorly 20°, 0°, posteriorly 20°). The loads induced during impression making, which were explained by the stress at the load cell of testing machine, were recorded and used for explaining the pressure of impression.The following results were obtained.1. The designs and the settling directions of the tray influenced the deformation of the flabby tissue.2. The deformation of the contour of flabby tissue could be reduced by increasing the number of escape hole and the thickness of spacer, but escape holes have more effect than spacers and settling directions.
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