Abstract
The reproducibility of denturous working models obtained from various impression materials was measured using a three-dimensional measuring system. In additon, the influences of various impression materials were evaluated by the normal deviation from profile measurement. In the working model obtained from alginate impression, deformation occurred in the anterior of the maxilla and mandible and also in the posterior of the mandible. In the working model obtained from condensation-type silicone rubber impression, the maxilla showed the highest reproducibility among all models, and the mandible deformed largely on the position of molars. In the working model obtained from addition-type silicone rubber impression, both the maxilla and mandible showed the largest deformation. It was possible to evaluate the reproducibility of a denturous working model effectively by the normal deviation obtained from the profile measurement.
