Abstract
Background This in vitro investigation aimed to evaluate and contrast the surface roughness of various implant superstructure materials before and after tooth brushing simulation.Objectives To evaluate the surface roughness of G1- PMMA Polymethyl Methacrylate G2- Polychrome composite and G3- Direct Metal Laser Sintering DMLS glazed Porcelain-Fused-to-Metal PFM restorative materials before and after brushing simulation.Methodology Six cuboid shaped specimens 10times10times2 mm were prepared from prepolymerized CADCAM Computer-aided design and Computer aided manufacturing PMMA CADCAM polychrome composite and conventional DMLS glazed porcelain fused metal N24. The specimens were subjected to 10000 brushing cycles simulating one year of tooth brushing using SD Mechatronik-Brushing Simulator ZM-3.8 and toothbrush amp toothpaste Colgate Palmolive Ltd. The surface roughness Ra was measured before and after brushing using Mitutoyo Surftest SJ-310 surface roughness analyzer.Results No significant change in surface roughness was found on CADCAM Polychrome composite after one year of simulated tooth brushing P gt0.05. However CADCAM PMMA and DMLS PFM demonstrated a significant increase in surface roughness P lt0.05.Conclusion Brushing led to an increase in the surface roughness of CADCAM PMMA and DMLS PFM. All surface roughness values were above the clinically acceptability threshold of 0.2 microm.
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