Evaluating resin-enamel bonds by microshear and microtensile bond strength tests: effects of composite resin

Abstract

ObjectivesThe aims of this study were to evaluate the effect of resin composite (Filtek Z250 and Filtek Flow Z350) and adhesive system [(Solobond Plus, Futurabond NR (VOCO) and Adper Single Bond (3M ESPE)] on the microtensile (µTBS) and microshear bond strength (µSBS) tests on enamel, and to correlate the bond strength means between them. Material and methodsThirty-six extracted human molars were sectioned to obtain two tooth halves: one for µTBS and the other one for µSBS. Adhesive systems and resin composites were applied to the enamel ground surfaces and light-cured. After storage (37ºC/24 h) specimens were stressed (0.5 mm/ min). Fracture modes were analyzed under scanning electron microscopy. The data were analyzed using two-way ANOVA and Tukey's test (α=0.05). ResultsThe correlation between tests was estimated with Pearson's product-moment correlation statistics (α =0.05). For both tests only the main factor resin composite was statistically significant (p<0.05). The correlation test detected a positive (r=0.91) and significant (p=0.01) correlation between the tests. ConclusionsThe results were more influenced by the resin type than by the adhesives. Both microbond tests seem to be positive and linearly correlated and can therefore lead to similar conclusions.

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

“…Most reported µSBS test results exhibit some form of adhesive and mixed failure modes for de-bonded specimens [3][4][5][6][7]24,25,[32][33][34].…”

Effect of temporary cements on the bond strength of a resin cement to a pre-hybridized dentin

“…Mechanical bond testing, such as microtensile bond and microshear bond tests, are required to examine the bond strength between different materials and dental substrates (ANDRADE et al, 2010;ZOHAIRY et al, 2010). The present study used the microshear bond test, which allows small areas to be tested, and it has the same advantages as the microtensile bond strength test, without the need for sectioning procedures to obtain specimens, as these laboratory procedures themselves may induce early micro-cracking within the specimen (ANDRADE et al, 2010).…”

“…The present study used the microshear bond test, which allows small areas to be tested, and it has the same advantages as the microtensile bond strength test, without the need for sectioning procedures to obtain specimens, as these laboratory procedures themselves may induce early micro-cracking within the specimen (ANDRADE et al, 2010). A better stress distribution can be accomplished in smaller specimens, using microshear bond strength testing, since the number of voids and stress-raising factors is lower than the ones that possibly occur in larger areas, such as those used for shear or tensile bond strength tests (GIACHETTI et al, 2012).…”

Tensile Bond Strength of Self Adhesive Resin Cement After Various Surface Treatment of Enamel

“…The resin penetrated into these micro porosities, intimately adheres to form retentive resin tag, generating higher micromechanical retention [23,34]. The extent and depth of the etching patterns influence the bonding performance of an adhesive [35][36][37]. In contrast, in control group intact smear layer prevented the cement from reaching into deeper unaffected enamel.…”