New composite resins: comparison of their resistance to toothbrush abrasion and characteristics of abraded surfaces.

Two of the newer composite resins, Miradapt and Visar-Fil, have resistance to toothbrush abrasion similar to that of Concise. After abrasion, the surface of these two resins appeared to be as rough as that of Concise. Prisma-Fil, Finesse, and Silar were abraded approximately six times as much as Concise. The abraded surface of Prisma-Fil was slightly granular, but the surface of Finesse and Silar was quite smooth. Surface characteristics after abrasion are attributable to the size of the largest particles used to make the composite resin. The blending of large and submicron particles may produce a composite that can initially be finished to an enamel-like smoothness, but eventually, toothbrush abrasion will produce a surface similar to that of a large particle resin, with the same potential for trapping stains and causing gingival irritation.