Influence of different manipulation methods on surface roughness of auto polymerized acrylic resin

Abstract

Objective: The aim of this study was to evaluate the surface roughness of acrylic resin according to the manipulation method.Methods: Sixty specimens were randomly divided into four groups (n=15) according to the manipulation method: G1 - addition with pressure, G2 - addition without pressure, G3 - mass with pressure and G4 - mass without pressure. After resin polymerization, all specimens were submitted to finishing with abrasive paper and mechanical polishing. Topographical surface analysis surfaces was performed twice on each sample using the rugosimeter. Results: The results were statistically analyzed and means were: G1 - 0,130μm; G2 - 0,120μm, G3 - 0,218μm e G4 - 0,192μm. ANOVA for one criterion and the Tukey test showed significant difference between G1 and G3, G2 and G3, G2 and G4. Conclusion: The manipulation method seems to affect the physical characteristics of auto polymerized acrylic resin. The addition manipulation method decreased the surface roughness.

Keywords

• orthodontic appliances removable
• orthodontics
• acrylic resins
• aparelhos ortodônticos removíveis
• ortodontia
• resinas acrílicas