Influence of Cervical End and Substrate on the Performance of CAD/CAM All-Ceramic and Resin Crowns

• Grant number: 25/13676-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: September 01, 2025
• End date: August 31, 2026
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal Investigator: Luís Roberto Marcondes Martins
• Grantee: Lavinya Araujo Santos Fonseca
• Host Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil

Abstract

Indirect restorations are essential in the rehabilitation of teeth with significant structural loss, offering long-lasting aesthetic and functional results. The choice of material, type of preparation and substrate directly influences the longevity and clinical success of the restoration. This project will aim to evaluate the influence of the type of cervical termination (shoulder or chamfer) and the cementation substrate (enamel, dentin or composite resin) on the performance of full crowns made with CAD/CAM materials, specifically ceramic and composite resin. The proposal seeks to understand how these variables affect essential parameters for the clinical success of indirect restorations, such as fracture resistance, marginal adaptation and occurrence of infiltration. This is an experimental in vitro laboratory study, with a complete factorial design, using 120 samples divided into 12 groups. Two CAD/CAM materials will be used: lithium disilicate reinforced glass ceramic and composite resin. The substrates include human dentin, micro-hybrid composite resin and pre-sintered zirconia discs. The crowns will be subjected to tensile strength tests, failure analysis, marginal adaptation assessment by scanning electron microscopy (SEM) and nanoleakage test with silver nitrate. At the end of the study, it is expected to provide scientific subsidies that guide the choice of the best restorative materials and techniques, considering the interaction between the type of preparation and the dental substrate, contributing to safer and more lasting clinical practices. (AU)