Effect of heating, build platform size and printing speed on the flexural strength, degree of conversion and accuracy of 3D-printed composite resin crowns

• Grant number: 24/14671-9
• Support Opportunities: Scholarships in Brazil - Master
• Start date: December 01, 2024
• End date: February 28, 2026
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Américo Bortolazzo Correr
• Grantee: Ulysses de Toledo Monteiro
• Host Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil
• Associated scholarship(s): 25/04024-9 - Effect of heating, build platform size, and printing speed on the physicochemical properties of 3D-printed composite resin restorations, BE.EP.MS

Abstract

This study will evaluate the effect of heating, platform size, and printing speed on the flexural strength, degree of conversion, and accuracy of filled resin crowns. To achieve these objectives, the study will be divided into two phases. In Phase 1, the crowns will be digitally designed using the Dental CAD 3.2 software (Exocad, Germany) from the scan of a prepared molar in a mannequin. The crowns will be printed in filled resin material on an LCD vat photopolymerization 3D printer using two printing platforms (original platform (OP) and reduced platform (RP) and at three temperatures (25ºC, 37ºC, and 50ºC). The dimensional accuracy of the crowns will be calculated by comparing samples (n=10) with the original digital design. Flexural strength (n=10) will be evaluated according to ISO 4049. The degree of conversion (n=5) will be assessed using FTIR. In Phase II, the effect of printing speed on the accuracy of 3D-printed crowns will be evaluated. Three printing speeds (n=10) will be assessed: Standard Speed (SS): crowns printed at 180mm/m; Fast Speed (FS): crowns printed at 225mm/m; and Very Fast Speed (VFS): crowns printed at 270mm/m. All data will be subjected to the Shapiro-Wilk and Levene tests and appropriate statistical analyses (¿=0.05).