Tokuyama Corporation

Masaaki Ushioda

Osamu Iwamoto

Masato Sekino

Kyoichi Fujinami

Hiroyuki Nakagawa

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

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.

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Tokuyama, Japan

Masaaki Ushioda