Comparison of microshear bond strengths of four self‐etching bonding systems to enamel using two test methods

Abstract

Background: Recent advances in enamel and dentine adhesive technology have resulted in the emergence of many new adhesive systems. Self-etching bonding systems do not require a separate etching step and the newest systems are the "all-in-one" systems which combine etching, priming and bonding into a single application. This study reports laboratory enamel microshear bond strengths of a self-etching priming and three all-in-one systems and also evaluates two different microshear bond test methods. Methods: One hundred and nineteen enamel specimens were bonded (0.8mm diameter) with either Clearfil Protect Bond (Kuraray), Xeno III (Dentsply), G Bond (GC) or One-Up Bond F (Tokuyama) using Palfique Estelite resin composite and stored in 37ºC water for seven days. The microshear bond test method used either a blade or wire to apply the shear stress. Results were analysed with one-way ANOVA and post hoc (Tukey) multiple comparison analysis. Results: Clearfil Protect Bond demonstrated higher and more consistent bond strengths than Xeno III, G Bond or One-Up Bond F. The wire method showed much greater reliability in results, with a coefficient of variation half that of the blade method. Conclusions: All-in-one adhesives seem to be less reliable than the two-step self-etching priming adhesive when bonding to enamel. Test method can significantly affect results in the microshear bond test method. Key words:Microshear bond test, all-in-one adhesives, self-etching priming adhesive, enamel, enamel bonding.Abbreviations and acronyms: ANOVA = analysis of variance; CEJ = cemento-enamel junction; DEJ = dentinoenamel junction; SEM = scanning electron micrograph.

Analysis of micro-shear bond strength of self-etch adhesive systems with dentine: An in vitro study

“…In self-etching systems, the separate etching step that is used in the conventional adhesives (etch-and-rinse) is no more required. 5 Acidic monomers in self-etch systems simultaneously etch and prime the dental hard tissues. Due to their acidic contents, self-etch adhesives are able to remove the smear layer and demineralise the surface of enamel/dentine.…”

A comparison of the micro-shear bond strength and failure mode of non-enclosed and mold-enclosed luting cements bonded to metal

“…Micro-shear bond strength (µSBS) is often used to demonstrate the adhesive properties of dental materials and adhesives to different substrates [1][2][3][4][5][6][7][8][9] . Micro-shear bond strength tests are influenced by a number of factors including the thickness of adhesive layer, size of bond area, cross-head speed, the mechanical properties of the adherand and adhesive and de-bonding procedure [10][11][12] .…”

Shear and micro-shear bond strengths of four self-etching adhesives measured immediately and 24 hours after application

“…The smaller the bonding area, the lower chance of encountering a flaw and the higher the bond strength of the specimen. Many studies, using both the static-load-to-failure test and the finite element test, have reported that a wire-loop method of loading leads to smaller stress concentration effects on the dentin substrate than knife blade loading 32,33) . In this study, the higher percentage of cohesive failures in resin of the micro-shear test, in which wire loop loading was used, was thus unexpected.…”