Patent ID: 9427379
Filing Date: 2016-08-30
CPC Classification: A61C,A61K

Claim Text:
1. A method of forming a two-layer membrane for obscuring a metal color, comprising the steps of: applying a first opaque material (A) on a dental metal surface and curing the first opaque material through photo-polymerization and/or thermo-polymerization to form a first opaque layer; and applying a second opaque material (B) on the first opaque layer at least one time or more, and curing the second opaque material through photo-polymerization and/or thermo-polymerization to form a second opaque layer, wherein the first opaque material (A) contains a polymerizable monomer (a1) in an amount of 100 parts by weight; an inorganic filler (a2) of indefinite-shape particles whose average particle size ranges from 0.1 μm to 20 μm in an amount ranging from 10 to 150 parts by weight; a polymerization catalyst (a3) in an amount ranging from 0.1 to 10 parts by weight; and an obscure material (a4) in an amount ranging from 0.5 to 20 parts by weight, and wherein the second opaque material contains a polymerizable monomer (b1) in an amount of 100 parts by weight; an inorganic filler (b2) of spherical-shape particles whose average particle size ranges from 0.1 μm to 20 μm in an amount ranging from 10 to 200 parts by weight; a polymerization catalyst (b3) in an amount ranging from 0.5 to 20 parts by weight; and an obscure material (b4) in an amount ranging from 1 to 25 parts by weight.