Influence of the occlusal thickness of the indirect restoration on the structural, mechanical and microbiological characteristics of ceramics with resin matrix for CAD/CAM, after immersion in different organic solvents simulating food

• Grant number: 23/06353-4
• Support Opportunities: Scholarships in Brazil - Master
• Effective date (Start): October 01, 2023
• Effective date (End): February 28, 2025
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Aldiéris Alves Pesqueira
• Grantee: Ana Beatriz de Souza Albergardi
• Host Institution: Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil

Abstract

Knowing the percentage of composite resin in the blocks for CAD/CAM, the occlusal thickness of the restoration, the quality of the surface polishing and the effect of exposure to organic solvents simulating food on the structural, mechanical, and microbiological properties of indirect restorations is fundamental to obtain clinically successful and longevity prostheses. However, there aren't studies in dentistry with these variables and it's necessary to study them. Therefore, the objective of this study will be to evaluate the influence of the occlusal thickness indirect restorations (0.5 mm - conservative restoration or 1.0 mm - conventional restoration) on the structural, mechanical and microbiological characteristics of 02 ceramics with resin matrix for CAD/CAM: a composite resin (Tetric CAD - Ivoclar) and another Zirconia-silica ceramic in a resin interpenetrating matrix (SHOFU HC - Shofu Dental), polished with diamond-coated silicone tips and immersed for 7 days in organic solvents simulating food (absolute ethanol, methylethylketone (MEK) and artificial saliva). One hundred twelve specimens of each ceramic will be manufactured with different dimensions for each respective analyses. The analyses will be: 1) structural analyzes (surface roughness (Ra), Vickers microhardness (VHN) and scanning electron microscopy (SEM); 2) mechanical analyzes (flexural strength (r) and elastic modulus (ME)) and 3) microbiological analyzes (quantification of cultivable cells (CFUs) and analysis of the structure of biofilms by scanning electron microscopy (SEM)). The data obtained in each analysis will be submitted to the normality test and subsequently to the most appropriate statistical test, with a significance level of 5%.