The Influence of Saliva pH on the Fracture Resistance of Three Complete Denture Base Acrylic Resins

Autor: Juliana de Sá, Francisca Vieira, Carlos Manuel Aroso, Mónica Cardoso, José Manuel Mendes, António Sérgio Silva
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: International Journal of Dentistry, Vol 2020 (2020)
Druh dokumentu: article
ISSN: 1687-8728
1687-8736
DOI: 10.1155/2020/8941876
Popis: Aim and Background. The absorption of fluids by denture base materials diminishes the mechanical properties such as hardness, strength, and fatigue limit due to the plasticizing effect of water. This study aimed to evaluate the influence of oral pH on the fracture resistance of prosthetic bases made of three different heat-polymerizable acrylic resin brands: RS Vertex®, Triplex Hot®, and Megacryl®. The strength needed to fracture the resins and the resistance to fracture each resin were evaluated. Methods. Ten prosthesis bases prepared with each brand of resin were subjected to neutral and low pH conditions (pH 7 and pH 4) by submerging them in artificial saliva for 30 days. After exposure, the fatigue resistance of the resins was tested using a Dental CS® Testing Machine. Statistical Analysis Test. The data sets were described quantitatively in terms of mean (M) and standard deviation (SD). Shapiro–Wilk tests and unilateral analysis of variance (ANOVA) were performed and complemented by Tukey’s multiple comparison tests. The effect size (η2), whose cohort points followed Cohen’s recommendations: 0.01 (low), 0.06 (medium), and 0.14 (high), was calculated. The results were considered significant if p
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