抄録
The purpose of this study was to determine the three-dimensional accuracy of a metal base made with the silicone duplicating impression system.
Three kinds of silicone duplicating impression systems were selected: Rema-Sil, Wirosil and Deguform. A partially edentulous maxillary dentition model (Kennedy class III) was used as the master model. Six measuring points were assigned to the abutment teeth and the medial parts of the palatal mucous. Duplicated casts using the duplicating impression systems were prepared. Subsequently based on these duplicated casts the metal base was cast with a cobalt-chrome alloy. The coordinates of each measuring point on the duplicated casts and the metal bases were measured using a three-dimensional measuring system.
The duplicated casts made with Rema-Sil and Deguform had almost the same dimensions as the master model in a horizontal direction to the occlusal plane and were larger than the master model in a vertical direction, while the duplicated cast made with Wirosil was slightly larger overall than the master model. The metal bases made with Rema-Sil and Deguform were slightly smaller horizontally and slightly larger vertically compared with the master model, while the metal base made with Wirosil was almost the same horizontally and slightly larger vertically but nearly the same size as the master model.
