Dental material set and a dental membrane for obscuring a metal color of a dental metal, and a preparing method thereof

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.