[Properties of experimental high abrasion resistance plastic teeth].

High abrasion resistance plastic teeth made of microfilled urethane dimethacrylate resin were developed around ten years ago. In recent years, several of this same type of resin teeth were developed and introduced commercially in Japan. Many studies have reported the properties of restorative resin materials, but few comparative studies have been conducted among the various resin teeth on the market. The purpose of this study was to compare the basic physical properties of conventional acrylic resin teeth as dental materials with an experimental high abrasion resistance plastic for posterior teeth made of microfilled urethane dimethacrylate. In addition, we compared the properties of the experimental teeth with the other high abrasion resistance plastic teeth including a comparative study of anterior and posterior teeth already on the market. The results indicated that basic physical properties of the experimental posterior resin teeth were better than those of the conventional acrylic resin teeth, but the staining resistance of the former was a little lower than that of the latter. Further, the experimental posterior teeth appeared to have physical properties equal to those of other resin teeth of the same type, but the staining resistance of the experimental resin teeth was higher.