Effect of gastric acids on the mechanical properties of conventional and CAD/CAM resin composites - An in-vitro study.

Dental erosion in patients with gastroesophageal reflux disease (GERD) is a current and frequent condition that may compromise the mechanical properties and clinical durability of resin-based composites (RBCs). This study assessed the mechanical properties of conventional and computer-aided design/computer-aided manufacturing (CAD/CAM) RBCs subsequent to simulated gastric acid aging. Three conventional and three CAD/CAM composites were assessed. They were divided into an experimental group (exposed to simulated gastric acid aging) and a control group (no aging). Both groups were analyzed for Vickers microhardness (VHN), wear and flexural strength over a period of six months. The failure rate probability for each RBC was calculated through the Weibull cumulative distribution function (m). Statistical analysis was conducted using repeated measures ANOVA, 3-way ANOVA, a non-parametric Kruskal-Wallis and U Mann-Whitney tests (α = 0.05). The mechanical properties of all the RBCs dropped significantly after aging (p < 0.05). Lower VHN and flexural strength values, along with greater wear values were evident in the experimental groups, though the effects of the treatment varied between RBCs. The Weibull m of all the RBCs decreased over time. Conventional RBCs might show greater reduction in mechanical properties compared to CAD/CAM RBCs when exposed to gastric acid attack. Thus, CAD/CAM composites may represent a suitable choice for the treatment of patients presenting erosive issues. Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.

Citation

Alexandra Gil-Pozo, Daniela Astudillo-Rubio, Álvaro Ferrando Cascales, Francesco Inchingolo, Ronaldo Hirata, Salvatore Sauro, Andrés Delgado-Gaete. Effect of gastric acids on the mechanical properties of conventional and CAD/CAM resin composites - An in-vitro study. Journal of the mechanical behavior of biomedical materials. 2024 Jul;155:106565

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PMID: 38718723

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