| 摘要 |
Flame - resistant, resin - coated, metal - supported structures are obtained by coating a metal base with a liquid polymerizable composition comprising a polyglycol dimethacrylate as the liquid phase and a methyl methacrylate polymer distributed therein, said polymer containing residual organic peroxide for aiding the setting of said composition, and heating the coated metal base to 250-450 DEG F. for 20-2 minutes to polymerize and set the coating. The invention is particularly suitable for producing dental crowns, wherein the metal base is formed from a noble metal. Suitable dimethacrylates include those of di-, tri-, and poly-ethylene glycols (degree of polymerization = 4 to 6). The monomer may include an inhibitor such as hydroquinone methyl ether. The polymer component may be a methyl methacrylate bead polymer, part of which is cross-linked with allyl methacrylate. Benzoyl peroxide is exemplified as the residual peroxide. The metal base may be primed with a coating of certain methyl methacrylate copolymers distributed in a polyglycol dimethacrylate, which primer is generally pigmented.ALSO:Dental crowns are produced by coating a suitably shaped metal base with a liquid polymerisable composition comprising a polyglycol dimethacrylate monomer as the liquid phase and a methyl methacrylate polymer distributed therein, said polymer containing residual organic peroxide for aiding the setting of said composition, and heating the coated metal base to 250 DEG -450 DEG F for 20-2 minutes to polymerise and set the coating. The metal base is preferably composed of a noble metal, e.g. Au, Ag, Pt, Irm Pd or Rh. The base may be primed with a composition comprising certain methyl methacrylate copolymers distributed in a polyglycol dimethacrylate, which primer is generally pigmented to simulate tooth or gingival shade. |
