Influência de diferentes potências de fotopolimerização na microdureza de resinas bulk fill

Abstract

The improvement of composite resin and photopolymerization mechanisms over the years has led to an improvement in the physical and mechanical properties of these composites, directly influencing the longevity of restorations. The objective of this work was to evaluate the influence of the power of the light-curing device on the polymerization of bulk fill resins. For this research, 90 specimens were made with different types of composite resin: a bulk fill with a regular consistency, a bulk fill with a fluid consistency and a conventional one (control group), subdivided into 3 subgroups according to the power used in the photopolymerizer Valo Cordless. Each specimen was photopolymerized at standard, high power and xtra power, according to its subgroup. The samples were then subjected to the Knoop microhardness test with readings on the top and bottom surfaces. For statistical evaluation, analysis of variance (ANOVA) was used, followed by Tukey's comparative test, establishing a significance level of 5% in all analyses. It was concluded that no statistically significant differences were found in bulk fill resins in any of the 3 powers and, when the Standard power was used, the conventional composite resin achieved better performance.