G-c Dental Industrial Corp.

G-c Toshi Kogyo Corporation

Taisei Dental Mfg. Co., Ltd.

Hiroyuki Hino

Fuminobu Kubo

Tsugumichi Kawasaki

Tsutomu Shibata

A dental refractory model material comprises as powdery components 5 to 20% by weight of a soluble phosphate, 5 to 20% by weight of magnesium oxide and 10 to 50% by weight of at least one selected from the group of alumina, zirconia, fused quartz, mullite, spinel and cordierite with the balance being crystalline quartz and crystobalite. The refractory model material also includes a liquid component such as a colloidal silica dispersion.

Dental refractory model materials

A pallet for handling water-permeable dental porcelain materials comprises a porous ceramic material formed of one or two or more selected from the group consisting of materials based on alumina, aluminium silicate, mullite, cordierite, zirconia and vitreous china and having a grain size of 1.0 to 30.0 .mu.m and a mean grain size of 1.5 to 25.0 .mu.m. The porous ceramic material having fine and even pores uniformly dispersed therethrough, as expressed in terms of a porosity of 15 to 65% and a mean pore size of 0.5 to 10 .mu.m.

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Ichinomiya, Japan

Hiroyuki Hino