Abstract: The present invention relates to a process for the preparation of a full-ceramic dental restoration, comprising heat pressing of a tooth coloured pressing glass on a fully or partially supporting structure of yttria doped tetragonal zirconia (YT/P), comprised of yttria doped tetragonal zirconia ceramic having a grain size, as measured by the linear intercept method, of less than 0.6 ?m, wherein the pressing glass has a thermal expansion coefficient (TEC) of between 9.0 and 1.0 ?m/m.K measured in the range of from 25 to 500° C.) and wherein the pressing glass has a pressing temperature of between 750 and 1000° C. In a further aspect, the invention relates to a full-ceramic dental restoration, comprising a fully or partially supporting structure of yttria doped tetragonal zirconia (YTZP) and a heat pressed tooth coloured pressing glass. which restoration is modelled to be in occlusal contact with opposing teeth and in mesio-distal contact with neighbouring teeth.

Abstract: The invention relates to a method for manufacturing a heat-resistant mold wherein heat-resistant investment material is inserted in a wax model manufactured in a conventional manner. The invention further relates to a low-dusting investment material, which low-dusting material is in particular heat-resistant. The investment material is applicable in dentistry, particularly for manufacturing molds.