The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 1978
Filed:
Mar. 17, 1976
Edward Charles Dart, Runcorn, EN;
John Burnett Cantwell, Runcorn, EN;
James Rodney Traynor, Runcorn, EN;
Joseph Franciszek Jaworzyn, Runcorn, EN;
Jozef Nemeck, Runcorn, EN;
Imperial Chemical Industries Limited, London, EN;
Abstract
A method of repairing teeth which comprises applying to the teeth a composition comprising (a) an inert, translucent, inorganic particulate filler (b) a polymerizable material comprising a polymerizable prepolymer containing at least two polymerizable ethylenically unsaturated groups and being the reaction product of a urethane prepolymer and a polymerizable ethylenically unsaturated monomer reactive with the urethane prepolymer; the urethane prepolymer being the reaction product of a diisocyanate and a diol; up to 100% by weight of the polymerizable prepolymer of a liquid ethylenically unsaturated monomer which is copolymerizable with the polymerizable prepolymer; and from 0.01 to 10% by weight of the polymerizable material of a photosensitive catalyst capable of curing the composition on exposure to visible light and comprising a photosensitizer selected from fluorenone and an .alpha.-diketone of the formula A.CO.CO.A, wherein the groups A are aliphatic, aromatic, cycloaliphatic, aralkyl or alkaryl, or together form a divalent aliphatic or aromatic group which together with the carbonyl groups forms a cyclic structure, and a reducing agent capable of reducing the photosensitizer when the photosensitizer is in an excited state, and curing the composition by irradiating the composition with visible radiation in the range 400 m.mu. to 500 m.mu..