Surface Reproduction of a Dental Stone Model : A Method for Determining the Surface Roughness of a Dental Stone Model

Abstract

To evaluate the surface reproduction of a dental stone model, measurement of the roughness of its smooth surface must be performed in combination with the reproduction test. Therefore, we developed a non-contact photogenic surface roughness analyzing system in which reflected light was used to measure roughness. Ra was found to decrease as the measured value increased. By the least square method, a negative correlation was found between the measured value and Ra. The appropriate angle between the light source of the system and the photodiode was found to be 160°. The results showed that this analyzing system can be used to evaluate the surface reproduction of a dental stone model when it is used in combination with the reproduction test.