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A study on surface reproduction of dental stone models. Detail reproduction test of dental stone and its surface smoothness.

A study was made of the detail reproduction test and roughness of the smooth surface of dental stone as a preliminary approach for examination of the surface reproduction of dental stone models made through combination of various impression materials.Measurement of the detail reproduction test was based on ISO 1563, while that of surface roughness was carried out using both an improved non-contact photogenic surface roughness analysis system and a contact surface roughness analysis system.The study produced the following findings : 1) It was clarified that almost all dental stones were capable of reproducing features 20 μm in size.2) There was a correlation between the relative reflection (RR) of the model surface and its arithmetic average roughness (Ra).A correlation was also found between RR and average angle (R Oa), and between RR and average wavelength (Rλa).