[Studies on sintering of dental porcelain. (Part 2) Binary system sintering of quartz and low fusing frit (author's transl)].

The effect of quartz addition was investigated on the sintering processes of powder compacts made from frit and glass powder with quartz powder. The results obtained are summarized as follows. 1) The quartz powder gave some effects on the shrinkage curves and the firing temperature range of frit and glass powder. Pyrex glass powder was more effective on the firing temperature range of the powder compacts with quartz addition comparing with other frits and glass powders. 2) The produced crystal during heat treatment of the powder compacts made from pyrex glass powder with quartz powder were cristobalite. 3) The sintered composite showed larger thermal expansion value by expansion due to the transition of cristobalite followed with the crystallization of cristobalite than that without crystallizing property.