Analysis of fracture resistance and marginal and internal adaptation of printed resin crowns subjected to different blasting protocols

• Grant number: 24/08917-5
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: December 01, 2024
• End date: November 30, 2025
• Field of knowledge: Health Sciences - Dentistry
• Principal Investigator: Emily Vivianne Freitas da Silva
• Grantee: Beatriz Almeida Oliveira
• Host Institution: Faculdade de Odontologia (FO). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Oral rehabilitation with printed resin has stood out for its speed and reliability. This technique for restorative procedures is integrated with the CAD/CAM (Computer-Aided Design/Computer-Aided Manufacturing) system, a digital technology that generates virtual images used for diagnosis and clinical case planning. To ensure efficient adaptation of these materials in tooth preparations, an adequate cementation technique is essential. Blasting with aluminum oxide (Al2O3) appears as an option to optimize cementation, due to its ability to create microretentions and roughness on the internal surface of the part. This study aims to compare the marginal and internal adaptation of a printed resin (VarseoSmile Crown Plus) and a milled resin (Cerasmart) and fracture resistance, in relation to the effect of blasting with Al2O3 with different particle sizes (50 and 100 µm) and applied pressure (0.2 and 0.3 MPa). Sixty crowns will be manufactured, subjected to different blasting protocols and scanned, their adaptation to the virtual master preparation being checked, using specific software (E3, 3Shape). Subsequently, the samples will be cemented under their preparations to analyze fracture resistance. The numerical values obtained will be subjected to the normality test. If the distribution is considered normal, analysis of variance (ANOVA) and Post-Hoc statistical test will be performed, with a significance level of 5%. If the distribution is not normal, non-parametric tests will be performed.