[Reproducibility of surface roughness in vivo using elastomers, compounds and the replica technique].

A direct profilometric evaluation of impression materials, particularly elastic materials, has not been possible up to now. The optical fine scanner RM 600 Laser Stylus (Rodenstock) allows touch-free scanning of surfaces, thus providing a direct quantitative assessment of impressions made with elastic materials. To determine the suitability of various impression materials and methods for direct profilometric analyses, the accuracy of reproduction was verified by comparing the surface structures of elastomer and compound impressions as well as replicas with the original. With two exceptions in the replicas, the mean roughness values (Rz) obtained showed no significant differences. This result suggests that the materials used are suitable for direct profilometric evaluation.