Comparative study of surface roughness between polyamide, thermoplasticpolymethyl methacrylate and acetal resins flexible denture base materials before and after polishing

摘要

The aim of this study was to compare the surface roughness of different types of flexible thermoplastic materials (polyamide, polymethyl methacrylate and acetal resins) before & after polishing. Materials and methods: seven specimens were made for each group. One surface was polished using the conventional laboratory polishing technique, while the other surface remain unpolished. A profilometer was used to measure the surface roughness. Results: One way anova was used to compare surface roughness of the three materials before and after polishing. The test revealed that the surface roughness was decreased in all materials after polishing with a statistical difference, and Polyamide (Breflex) exhibited the least surface roughness values. Conclusion: All tested materials exhibited a little degree of roughness, below the threshold Ra=0. 2 μm. The surface smoothness of all resin specimens, was produced successfully by conventional laboratory polishing.