Effect of preheating and ultrasound application of resin‐based luting agents on the failure load of a lithium disilicate glass‐ceramic

Abstract

AbstractPurposeTo assess the effect of preheating resin‐based materials and ultrasound application on the failure load of a lithium disilicate glass‐ceramic.Materials and methodsNinety ceramic specimens were produced (14×12×1.0 mm) and divided into 9 groups (n = 10) to be bonded to a dentin analog (Nema G10) with light‐cured luting agent (LC), flowable resin composite (FL), and supra‐nano filled resin composite (SN), as follows: LC/R – LC at room temperature; LC/P – preheated LC; LC/P/U ‐ preheated LC and Ultrasound; FL/R ‐ FL at room temperature; FL/P ‐ preheated FL; FL/P/U – preheated FL and Ultrasound; SN/R – SN at room temperature; SN/P ‐ preheated SN; SN/P/U ‐ preheated SN and Ultrasound. The failure load test was performed in a universal testing machine with the aid of acoustic detection. The data was analyzed with two‐way ANOVA (for failure load) and Weibull statistics (Weibull modulus ‐ m and characteristic strength, based on 95% confidence intervals ‐ CI).ResultsThe analyses of failure load revealed no statistically significant difference among groups considering the type of luting agent (P = 0.075; F = 2,673), the application method (P = 0.772; F = 2,259), and the interaction between them (P = 0.297; F = 1,248). The characteristic strength did not show differences among groups (95% CI). The m, which indicates structural reliability, showed lower values for SN/P/U and SN/P, with a difference from other selected groups (95% CI).ConclusionPreheating of resin‐based materials and ultrasound application did not affect the failure load of lithium disilicate glass‐ceramic. Lower reliability was observed with supra‐nano filled resin composite.