SummaryThe problems encountered in casting titanium in dentistry have not been completely resolved. The Procera system forms crowns by means of a combination of spark‐erosion and milling. The accuracy of fit was examined before and after ceramic veneering bothin vitroandin vivo. Before veneering, on conical surfaces space widths were approximately 53 μmin vitroand 69 μmin vivo. At shoulders and occlusal surfaces, spaces of about 430 μm were measuredin vitroand of about 500 μm were measuredin vivo. After ceramic veneering, slight increases in space widths could be observed. The metal‐ceramic compound was tested by the 3‐point bending test (DIN) and the bending test (ISO). The DIN test was satisfactory, but not the ISO test. It is concluded that titanium crowns processed by the Procera System are suitable for clinical usage, if the space widths at shoulders and the occlusal surface and the special requirements of tooth preparation are taken int
展开▼
