Influence of Hemostatic Solution on Bond Strength and Physicochemical Properties of Resin Cement.

Isabela Sousa De Araújo,Carlos Rocha Gomes Torres,Reinaldo Ruggiero,Carlos José Soares,Célio Jesus Do Prado,Luís Henrique Araújo Raposo,Rayssa Ferreira Zanatta,Gisele Rodrigues Da Silva

doi:10.1590/0103-6440201701481

Isabela Sousa De Araújo, Carlos Rocha Gomes Torres + Show 6 more

Open Access

https://doi.org/10.1590/0103-6440201701481

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Abstract

The aim of this study was to evaluate the degree of conversion, color stability, chemical composition, and bond strength of a light-cured resin cement contaminated with three different hemostatic solutions. Specimens were prepared for the control (uncontaminated resin cement) and experimental groups (resin cement contaminated with one of the hemostatic solutions) according to the tests. For degree of conversion, DC (n = 5) and color analyses (n = 10), specimens (3 mm in diameter and 2 mm thick) were evaluated by Fourier transform infrared spectroscopy (FTIR) and CIELAB spectrophotometry (L*, a*, b*), respectively. For elemental chemical analysis (n = 1), specimens (2 mm thick and 6 mm in diameter) were evaluated by x-ray energy-dispersive spectroscopy (EDS). The bond strengths of the groups were assessed by the microshear test (n = 20) in a leucite-reinforced glass ceramic substrate, followed by failure mode analysis by scanning electron microscopy (SEM). The mean values, except for the elemental chemical evaluation and failure mode, were evaluated by ANOVA and Tukey's HSD test. The color stability was influenced by storage time (p<0.001) and interaction between contamination and storage time (p<0.001). Hemostop and Viscostat Clear contamination did not affect the DC, however Viscostat increased the DC. Bond strength of the resin cement to ceramic was negatively affected by the contaminants (p<0.001). Contamination by hemostatic agents affected the bond strength, degree of conversion, and color stability of the light-cured resin cement tested.

Highlights

The increasing demand for porcelain laminate veneers has led to the continuous development of dental ceramics with improved optical properties, translucency, and esthetics [1]
Tukey test demonstrated that HS and Viscostat Clear (VC) had significant lower DE than VS and control group (CT), and no difference was found between DE values for CT and VS at 1 month
Color stability was found for the CT and VS groups, DE increased with time for the HS and VC groups

Summary

Introduction

The increasing demand for porcelain laminate veneers has led to the continuous development of dental ceramics with improved optical properties, translucency, and esthetics [1]. Adhesive luting promotes increased fracture resistance of ceramic materials by cement penetration into the irregularities present at the internal surface of the restoration, leading to higher bond strength and lower crack propagation [4] photoactivated resin cements (light-cured) have better color stability compared with that of chemically or dual-cured resin cements [5]. This fact is probably related to the absence of chemical activator binders (tertiary amines) present in the catalyst, which can cause color changes over time [5]. Suboptimal polymerization might lead to unfavorable changes, causing restoration detachment, caries formation, or discoloration around the adhesive, all of which are of clinical concern [8]

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