Avaliação das propriedades mecânicas de resinas para base de dentaduras confeccionadas pelo método convencional e CAD/CAM com diferentes tratamentos de superfície.

Abstract

Problem statement: The manufacture of dentures using the CAD/CAM method, whether by milling or 3D printing, is highly trained in dentistry, as these are methods that have been conquering the market and are highly used by clinical professionals. Goal. Evaluate the mechanical properties of different types of acrylic resins used to make denture bases with different types of surface treatments. Materials and methods: A total of 60 samples were made, divided between the three resin groups (conventional, milled and 3D printed), subdivided by the two surface treatment subgroups (mechanical polishing and light-cured enamel), in which surface microhardness tests were carried out with a Knoop diamond, flexural strength and modulus of elasticity by 3-point test on a universal testing machine. The two-way ANOVA analysis of variance test was applied with a significance level of p <0.05, considering the factors resin and surface treatment. Results: All resins presented significantly higher values with light-cured enamel when compared to polishing (P<0.001). The 3D printed resin presented significantly lower values in flexural strength and elastic modulus (p<0.05). Conclusion: The milled denture base resin showed the best mechanical properties with both polishing and light-curing enamel. Keywords: Dental Prosthesis; Denture; PMMA; CAD/CAM; Assessment of mechanical properties.