Avaliação das propriedades de placas para bruxismo dos métodos convencionais e tecnologia CAD/CAM após desafio erosivo

Abstract

SANTOS DS. Evaluation of the Properties of Bruxism Splints Made by Conventional Methods and CAD/CAM Technology After Erosive Challenge. Campo Grande 2025. [Undergraduate Thesis - Federal University of Mato Grosso do Sul] Clinical statement: The fast-paced lifestyle and frequent stress have contributed to the increase in bruxism, characterized by clenching or grinding of the teeth during sleep. As a result, the use of nocturnal occlusal splints is increasing. Given this scenario, it is essential that the dentist be aware of the properties of interocclusal splints, especially in patients with gastrointestinal disorders, highlighting those produced by the digital CAD/CAM system. Objective: To evaluate the surface properties (roughness and microhardness) of resins used in the fabrication of interocclusal splints using conventional methods (thermopolymerizable, autopolymerizable, and mixed) and CAD/CAM (milled and 3D printed) at different aging times under erosive challenge. Materials and methods: This is a laboratory experimental study in which 50 samples were fabricated from different materials: thermopolymerizable, autopolymerizable, mixed, milled, and 3D printed resin (n=10). The samples were immersed in a 5% hydrochloric acid solution (pH 2.0) for up to 91 hours, with roughness and microhardness analyses performed at times T0, T1, and T2. Data were analyzed using two-way ANOVA (p<0.05) and Tukey's test. Results: All resins showed significant changes after acid aging; however, the milled splints exhibited a smaller increase in roughness and a smaller reduction in microhardness, indicating greater resistance and surface stability. The autopolymerizable and mixed resins showed greater susceptibility to chemical degradation. Conclusion: The milled resin showed greater resistance and stability in an acidic environment, while conventional resins showed greater degradation and lower durability under erosive conditions. Keywords: Bruxism, Occlusal splint, CAD/CAM, Gastroesophageal reflux, Surface roughness.