Enamel Wetness Effects on Bond Strength Using Different Adhesive Systems

Abstract

The enamel surface should not be desiccated extensively when an all-in-one self-etching adhesive is employed. SUMMARYObjective: To evaluate, through the application of different dentin bonding systems, the influence of wetness on shear bond strength in enamel.Methods: This study evaluated three etch-andrinse adhesive systems (Scotchbond MP [used with and without primer]; Singlebond; and Prime&Bond 2.1) and two self-etching adhesive systems (Clearfil SE Bond; and Xeno IV). Flat bovine enamel surfaces were either airdried for 30 seconds or blotted with absorbent paper after acid-etching for the conventional bonding agents or before the application of self-etching bonding agents. The resin composite EsthetX was bonded to flat surfaces that had been treated with one of the adhesives, following the manufacturer's instructions. After being stored in water at 378C for one week, bonded specimens were broken in shear. Data were evaluated with two-way analysis of variance (ANOVA) and Student-Newman-Keuls tests (a¼0.05). For comparing each condition , 2011, 36-3, 274-280 individually, regardless of the adhesive or wetness condition, a one-way ANOVA and a Student-Newman-Keuls test (a¼0.05) were applied.Results: The two-way ANOVA showed significant differences among adhesive systems. An interaction effect was also observed (p,0.05), but wetness did not influence shear bond strength (p¼0.98). The one-way ANOVA showed that the all-in-one adhesive was the only material influenced by the presence of water at the enamel's surface.Conclusion: The all-in-one adhesive behaved differently depending on whether the enamel surface was dry or wet.

Micro-shear bond strength of adhesive resins to enamel at different relative humidity conditions

“…Furuse et al 25) applied five different adhesive systems including SB2 and CSE and found no statistical difference between μSBS of resin composite to the wet and dry enamel surfaces. Similarly, Chuang et al 26) reported that marginal quality was not affected when SB2 was applied on dry and wet enamel.…”

Comparative Evaluation of Self-etching Primers and Phosphoric Acid Effectiveness on Composite to Enamel Bond: An in vitro Study

“…8 In other studies, results have shown that one step self-etch adhesives can produce shear bond strengths to ground enamel that are even higher than those of total-etch adhesive systems. 9,10 In this study, the self-etching systems showed lower bond strengths to enamel compared to a total-etch system. This could be due to less demineralization of enamel by the priming agent compared.…”

“…10 The time saving and efficiency of the selfetching primers approach combined is certainly a significant advantage when compared to the many multiple step adhesive systems. Nevertheless, it is questionable whether enamel adhesion tests in vitro are representative of in vivo performance of bonding materials which were believed to be less effective under clinical conditions rather than under laboratory ones.…”

“…Nevertheless, it is questionable whether enamel adhesion tests in vitro are representative of in vivo performance of bonding materials which were believed to be less effective under clinical conditions rather than under laboratory ones. 10 More research is needed to know the mechanism of performance of these self-etching primers, especially on the enamel surface.…”

Influence of different dentin drying methods on adhesive behavior of composite restorations

“…Fracture patterns in specimens after microshear bond strength test. This work used the in vitro method with bovine incisor teeth selection 14,15 , maintained in formalin 2% during 15 days for disinfection 16 .…”