Avaliação das propriedades ópticas e superficiais de diferentes resinas utilizadas para base de prótese total com ou sem o uso do glaze

Abstract

Removable complete dentures are the less invasive and more economical option for prosthetic rehabilitation, and they are manufactured using acrylic resin, such as polymethyl methacrylate (PMMA), due to its physical and aesthetic properties. The objective of this study was to evaluate the differences in microhardness, roughness, optical characteristics, of different resins used for the fabrication of complete denture bases in relation to the type of finishing (polishing or polishing and glaze) before and after thermocycling (TC). Four types of resins were considered based on the manufacturing method: conventional TC (water bath) or (microwave); milled PMMA, and 3D printed resin. A total of 160 samples were fabricated, with a diameter of 10 mm and a thickness of 3 mm. The resin variables were: with polishing/with glaze (P/G); with polishing/without glaze (P/NG); without polishing/with glaze (NP/G). Without polishing/without glaze (NP/NG). A two-factor analysis of variance was performed using the JAMOVI program. The highest color change values (ΔE) were found in the 3D resin for the groups that underwent mechanical polishing (P/G; P/NG). Before TC, the SP/SG group exhibited the highest roughness values with a significant difference compared to all other polishing methods, regardless of resin type (P < 0.05).In the microhardness analysis before TC, lower microhardness values were observed for 3D printed resins (p < 0.001), especially for the NP/G group. It is concluded that the absence of mechanical polishing contributed to greater color change and roughness. The types of polishing influenced the microhardness properties in relation to the different resin types, with 3D printed resin showing the highest variability before and after TC.