Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1986-03-27
1986-12-02
McCarthy, Helen M.
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
106 35, 4332031, 501 45, 501 46, 501 48, 501 73, A61C 1308, C03C 1002
Patent
active
046265147
ABSTRACT:
Dental materials using calcium phosphate glass-ceramics and having the color tone with high approximation to that of natural teeth. In those dental materials, calcium phosphate composite, nickel oxide and one or more other type of compounds selected from oxides of iron, manganese, cerium, titanium and tungsten, are contained as coloring component. Also, if necessary, Al.sub.2 O.sub.3 and/or SiO.sub.2 is contained as a color assisting agent in that composite. The calcium phosphate glass-ceramic according to this invention consists of the same components as that of natural teeth. Besides, it is possible to adjust the color tone delicately to match with the color tone of each individual`s teeth. Moreover, the coloring components are incorporated in crystals of calcium phosphate. Consequently, they cause no elution during use and are therefore ideal as dental material.
REFERENCES:
patent: 4167417 (1979-09-01), Franz et al.
patent: 4189325 (1980-02-01), Barrett et al.
patent: 4309485 (1982-01-01), Kondo
patent: 4366253 (1982-12-01), Yagi
patent: 4417912 (1983-11-01), Abe
Stecher, P. G., New Dental Materials, 1980, pub'd by Noyes Data Corp., Park Ridge, N.J., p. 110.
Phillips, R. W., Skinner's Science of Dental Materials, 8th ed., 1983, pub. by W. B. Saunders & Co., Phila., p. 503.
Kamegawa Keiji
Kihara Seiji
Makino Yasuhiro
Takeuchi Yoshimitsu
Tokuda Hiroyasu
Kyushu Refractories Co., Ltd.
McCarthy Helen M.
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