Analysis of physical and mechanical properties before and after thermocycling of printed resins used for making occlusal splints.

• Grant number: 23/05068-4
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: June 01, 2023
• End date: October 03, 2025
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Ana Paula Macedo
• Grantee: Sarah Ribeiro Cruz Araújo
• Host Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
• Associated scholarship(s): 24/19155-9 - Identification of components of the extracellular matrix of Streptococcus mutans on the surface of different 3D printing resins for occlusal splints, BE.EP.IC 23/14886-2 - Occlusal devices 3d-printed in different orientations: a trueness analysis, BE.EP.IC

Abstract

The prevalence of bruxism is increasing in society. To prevent the worsening of thiscondition, occlusal splints have been indicated, which are predominantly produced fromthermopolymerizable resins based on Polymethyl methacrylate (PMMA). The emergence ofCAD/CAM technology and 3D printing resins in digital dentistry has made it possible tomanufacture these intraoral devices in a more advantageous way, aiming for a moreadvantageous process in financial, aesthetic, environmental, laboratory, and clinical issuescompared to thermopolymerizable resins based on PMMA. However, there are still fewstudies in the literature that investigates the long-term physical and mechanical properties ofprinting resins. Thus, this study aims to analyze the physical and mechanical properties ofthree 3D-printing resins (Smart Print Bio Bite Splint Clear - Smart Dent®, Cosmos Splint -Yller®, and SS Splint - Printax®) using thermopolymerizable resin as control (Classic) afterthermocycling procedures simulating one and five years of aging. Forty circular specimenswith dimensions of Ø 14 mm x 3 mm will be used for Knoop microhardness analysis,roughness, changes in color, gloss, and translucency; 40 specimens with dimensions of Ø 50mm x 0.5 mm, for sorption and solubility; 120 rectangular specimens, 65 mm x 10 mm x 3.3mm, to analyze flexural strength and dynamic modulus of elasticity. The results obtained willbe evaluated in an appropriate statistical model. Hence, it is expected to verify if 3D printingresins have adequate physical and mechanical stability to be a viable alternative forsubstituting thermopolymerizable resins based on PMMA, considered the gold standardmaterial for manufacturing occlusal splints.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

CRUZ-ARAUJO, SARAH RIBEIRO; SAMPAIO-FERNANDES, MANUEL ANTONIO; DE FREITAS, BRUNA NEVES; SIMIONATO, ANSELMO AGOSTINHO; FIGUEIRAL, MARIA HELENA; MACEDO, ANA PAULA. Accuracy of occlusal splints printed in different orientations by liquid crystal display technology: an in vitro study. Journal of Dentistry, v. 152, p. 7-pg., 2024-11-29. (23/14886-2, 23/05068-4)