The effect of colloidal silica and diamond suspensions on the surface roughness of automatically finished heat-polymerized acrylic resin

摘要

Statement of problemOn an acrylic resin denture base, a smooth and highly polished surface is important to maintain oral health and prevent bacterial colonization. It is unclear how best to obtain such a surface. PurposeThe purpose of this in?vitro study was to examine the effect of both colloidal silica and diamond suspension abrasives on the roughness values of polymethyl methacrylate (PMMA) denture base material. Material and methodsThirty PMMA specimens were fabricated and divided into 3 groups (n=10). Each was automatically polished using a diamond suspension, a colloidal silica suspension, and pumice. The mean roughness value (Ra) after polishing was recorded using a profilometer. An optical electron microscope was further used to evaluate the smoothness of the polished surface. ANOVA was used to analyze the roughness average (Ra) values for all polished specimens. A multicomparison test with Bonferroni correction was used to identify the mean differences among the 3 abrasive materials (α=.05). ResultsThe Ravalues measured for the colloidal silica suspension and pumice were statistically different (P .05). The PMMA specimens polished using pumice had the highest Ravalues, whereas specimens polished using the colloidal silica suspension had the lowest Ravalues. ConclusionsThe colloidal silica produced the lowest Ravalues and was the most effective polishing material for denture base resins.