Abstract
Aim: The purpose of this study was to compare the microhardness, diametral tensile strength, compressive strength and the rheological properties of self-adhesive versus conventional resin cements. Methods: Specimens of a conventional (RelyX ARC) and 3 self-adhesive (RelyX U200, Maxcem Elite, Bifix SE) types of resin cements were prepared. The Knoop test was used to assess the microhardness, using a Microhardness Tester FM 700. For the diametral tensile strength test, a tensile strength was applied at a speed of 0.6 mm/minute. A universal testing machine was used for the analysis of compressive strength and a thermo-controlled oscillating rheometer was used for the Rheology test. One-way ANOVA and Tukey’s test (α=0.05) were used for data analysis. Results: According to microhardness analysis, all the cements were statistically similar (p>0.05), except for Maxcem that presented lower hardness compared with the other cements in relation to the top surface (p<0.05). In the diametral tensile strength test, Relyx U200 and RelyX ARC cements were statistically similar (p>0.05), presented higher value when compared to the Maxcem and Bifix cements (p<0.05). The compressive strength of RelyX ARC and Maxcem Elite cements was statistically higher than RelyX U200 and Bifix cements (p<0.05). Regarding the rheology test, Maxcem Elite and RelyX ARC cements showed a high modulus of elasticity. Conclusions: The self-adhesive cements presented poorer mechanical properties than conventional resin cement. Chemical structure and types of monomers employed interfere directly in the mechanical properties of resin cements.
Highlights
The performance of resin cement on the luting procedure and their mechanical properties are essential requirements for the clinical success of indirect restorations[1]
The physical and mechanical properties investigated were different among the tested resin cements
The results could be related to the different chemical composition of the materials
Summary
The performance of resin cement on the luting procedure and their mechanical properties are essential requirements for the clinical success of indirect restorations[1]. Due to its low solubility, high bonding strength, better physical and mechanical properties such as high values of fracture toughness, tensile strength and compression, resin cements are frequently used in the cementation of ceramics[2,3,4]. The broad variety of brands and types of resin cements makes the selection of material difficult for the dentist. Resin cements were developed to be used in the cementation of indirect restorations and intra-radicular pins; they contain different types of monomers that connect to each other during the polymerization reaction[5]. The manufacturers of several materials often do not entirely disclose details of cement composition
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