Abstract
BackgroundNo specific indications about the pre-treatment of indirect composite restorations is provided by the manufacturers of most self-adhesive resin cements. The potential effect of silane treatment to the bond strength of the complete tooth/indirect restoration complex is not available.The aim of this study was to determine the contribution of different surface treatments on microtensile bond strength of composite overlays to dentin using several self-adhesive resin cements and a total-etch one.Material and MethodsComposite overlays were fabricated and bonding surfaces were airborne-particle abraded and randomly assigned to two different surface treatments: no treatment or silane application (RelyX Ceramic Primer) followed by an adhesive (Adper Scotchbond 1 XT). Composite overlays were luted to flat dentin surfaces using the following self-adhesive resin cements: RelyX Unicem, G-Cem, Speedcem, Maxcem Elite or Smartcem2, and the total-etch resin cement RelyX ARC. After 24 h, bonded specimens were cut into sticks 1 mm thick and stressed in tension until failure. Two-way ANOVA and SNK tests were applied at α=0.05.ResultsBond strength values were significantly influenced by the resin cement used (p<0.001). However, composite surface treatment and the interaction between the resin cement applied and surface treatment did not significantly affect dentin bond strength (p>0.05). All self-adhesive resin cements showed lower bond strength values than the total-etch RelyX ARC. Among self-adhesive resin cements, RelyX Unicem and G-Cem attained statistically higher bond strength values. Smartcem2 and Maxcem Elite exhibited 80-90% of pre-test failures.ConclusionsThe silane and adhesive application after indirect resin composite sandblasting did not improve the bond strength of dentin-composite overlay complex. Selection of the resin cement seems to be a more relevant factor when bonding indirect composites to dentin than its surface treatment. Key words:Bond strength, self-adhesive cement, silane, dentin, indirect composite.
Highlights
Indirect resin composite restorations are routinely used to restore teeth with extensive coronal loss as they are more resistant to occlusal wear than direct composite restorations and allow achieving proper proximal contacts and occlusal anatomy [1]
Indirect composite restorations are subjected to an additional post-cure under pressure, vacuum, inert gas, light, heat or a combination of these conditions, to increase resin conversion and enhance their physical properties, but it lessens the potential for chemical bonding as the quantity of residual free carbon double bonds decreases [1,4]
No specific indication about the pre-treatment of indirect composite restorations is provided by the manufacturers of self-adhesive resin cements
Summary
Indirect resin composite restorations are routinely used to restore teeth with extensive coronal loss as they are more resistant to occlusal wear than direct composite restorations and allow achieving proper proximal contacts and occlusal anatomy [1]. Adhesion to tooth structure is accomplished by the application of dual-cure resin cements that may require the application of an etch-and-rinse adhesive system, a self-etching primer or no tooth pretreatment as occurs with self-adhesive resin cements [8] This simplicity in the clinical procedure together with their ability to bond to different restorative substrates has made these self-adhesive luting agents increasingly popular [8]. The potential effect of silane treatment to the bond strength of the complete tooth/indirect restoration complex is not available.The aim of this study was to determine the contribution of different surface treatments on microtensile bond strength of composite overlays to dentin using several self-adhesive resin cements and a total-etch one. Composite overlays were luted to flat dentin surfaces using the following self-adhesive resin cements: RelyX Unicem, G-Cem, Speedcem, Maxcem Elite or Smartcem, and the total-etch resin cement RelyX ARC. Selection of the resin cement seems to be a more relevant factor when bonding indirect composites to dentin than its surface treatment
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