Tokuyama Corporation

Other

Masato Sekino

Osamu Iwamoto

Masaaki Ushioda

Kyoichi Fujinami

Yutaka Kobayashi

Hideki Ohno

Hiroyuki Nakagawa

Masatoshi Tsuchiya

Atsushi Mogami

A method of preparing a ceramic artificial crown by applying at least one kind of dental porcelain onto the surface of a ceramic core molded by heating and softening a ceramic material and putting it into a mold with the application of pressure followed by firing wherein said mold is the one formed by burning a wax pattern after having removed a crucible former from an assembly which makes it possible to efficiently prepare a fully ceramic artificial crown of a high quality in a short period of time.

Method of preparing a ceramic artificial crown and a preparation kit used therefor

Method of producing ceramic crowns

A pressure molding apparatus comprises a furnace defining a heating space for accommodating a mold assembly including a mold body charged with a raw material to be molded, and a pressure piston for pressurizing the raw material; heating means for heating the heating space; and load imposing means for imposing a load on the pressure piston to mold the raw material. The load imposing means includes at least one weight means and weight supporting means. The weight supporting means is selectively set in a load-free state in which the weight supporting means supports the weight means so that the weight of the weight means is not imposed on the pressure piston, and a load imposed state in which the weight supporting means releases the support of the weight means so that the weight of the weight means is imposed on the pressure piston.

Pressure molding apparatus

Provided is a porcelain which is suitable as a dental porcelain capable of being fired on a ceramics core and has a low firing temperature and a low thermal expansion coefficient and which is excellent in a chemical durability. The above dental porcelain comprises glass containing silicon oxide, aluminum oxide, boron oxide, zinc oxide, sodium oxide and lithium oxide as principal components. The contents of these respective components in the above glass are 57 to 65% by weight of SiO,, 8 to 18% by weight of Al,O,, 15 to 25% by weight of B,O,, 0.1 to 2% by weight of ZnO, 3 to 7% by weight of Na,O and 2 to 8% by weight of Li,O respectively in terms of a percent by weight based on the total of the respective components when the respective components are reduced to SiO,, Al,O,, B,O,, ZnO, Na,O and Li,O respectively. The particularly preferred dental porcelain comprises glass having a thermal expansion coefficient of 6.0&times;10,(1/&deg;C.) or less as a principal structural component.

Dental porcelain

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Tokuyama, Japan

Masato Sekino