Coloring materials for denture-base resins Part II. Suitability for use

Abstract

The miscibility of the coloring materials with the methyl methacrylate resin renders the colors sufficiently bonded to make them relatively stable to leaching processes. Fine polymer granules proved to be stable to leaching in media of acetic acid, alcohol, and saliva. Bicarbonate of soda had a marked leaching effect upon several of the samples. No untoward effects were produced from the clinically tested color samples using the patch test method. The pigmented commercially available dental plastics were susceptible to leaching in the bicarbonate of soda solution and to a lesser degree in the acetic acid, ethyl alcohol, and saliva. Although the color content was excessive in the new colored acrylic resin samples, the leaching effect was much less in most of them than in the commercially available denture-base acrylic resins. Reaction in the subcutaneous tissue was not altered by the addition of selected coloring materials to clear methyl methacrylate resin when implanted subcutaneously in dogs.