Abstract
Aim of this study was to investigate a specific airborne particle abrasion pretreatment on dentin and its effects on microtensile bond strengths of four commercial total-etch adhesives. Midcoronal occlusal dentin of extracted human molars was used. Teeth were randomly assigned to 4 groups according to the adhesive system used: OptiBond FL (FL), OptiBond Solo Plus (SO), Prime & Bond (PB), and Riva Bond LC (RB). Specimens from each group were further divided into two subgroups: control specimens were treated with adhesive procedures; abraded specimens were pretreated with airborne particle abrasion using 50 μm Al2O3 before adhesion. After bonding procedures, composite crowns were incrementally built up. Specimens were sectioned perpendicular to adhesive interface to produce multiple beams, which were tested under tension until failure. Data were statistically analysed. Failure mode analysis was performed. Overall comparison showed significant increase in bond strength (p < 0.001) between abraded and no-abraded specimens, independently of brand. Intrabrand comparison showed statistical increase when abraded specimens were tested compared to no-abraded ones, with the exception of PB that did not show such difference. Distribution of failure mode was relatively uniform among all subgroups. Surface treatment by airborne particle abrasion with Al2O3 particles can increase the bond strength of total-etch adhesives.
Highlights
It is well known that dentin has several intrinsic features making in complex mode the adhesion of resinous materials
The bonding surfaces were examined under a stereomicroscope (Nikon SMZ10, Tokyo, Japan) to ensure that they were free from residual enamel
Two-way ANOVA showed that the adhesive system used and the pretreatment
Summary
It is well known that dentin has several intrinsic features making in complex mode the adhesion of resinous materials (wet, inhomogeneity, and smear layer). It is already accepted that, for total-etch adhesives, the interaction is mainly micromechanical: it is essential to make hybrid layer and resin tags to obtain a reliable dentin adhesion. With the aim of improving the interaction between resin and dentin, several dentinal pretreatments techniques have been tentatively introduced [3, 4]. Besides to be the requirement for micromechanical adhesion, pretreatments can be used with the aim of removing debris that can impair the final bonding restoration [5]. They can impair etching quality or may even inhibit the resinous monomers polymerization [6]
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