Abstract
This study aimed to investigate the effects of subpressure on the bond properties of total-etching adhesive to dentin. Thirty-six caries-free premolars were sectioned parallel to the occlusal plane and randomly divided into four groups (n = 9): a control group (C, no treatment) and three subpressure groups, which were treated under 0.8, 0.6 or 0.4 bar after applying adhesives, named S8, S6 and S4, respectively. Afterward, resin was bonded to the dentin surface, and 27 beams (1.0 mm × 1.0 mm) of each group were sectioned. One was selected to observe the bonding interface from each group by SEM. Each group was divided into two subgroups (n = 13): 24 hours of water storage (I) and 10,000 thermocycling (A). The microtensile bond strength (μTBS), failure modes and nanoleakage expression were evaluated. SEM results showed that the subpressure groups had longer and denser resin tags. The μTBS of the subpressure groups was higher than that of the control group (p < 0.05). The subpressure groups were dominated by mixed failure, whereas main interfacial failure appeared in group C. The subpressure groups showed less silver deposition than the control group (p < 0.05). The subpressure technique may remarkably improve bonding strength and decrease nanoleakage on total-etching bonding.
Highlights
IntroductionThe dentin bonding system has a great effect on the clinical success
In dental restorative procedures, the dentin bonding system has a great effect on the clinical success
Dentin bonding has been studied for decades
Summary
The dentin bonding system has a great effect on the clinical success. The others have explored new adhesives to improve the penetration and resin tags length of adhesives[8]. The resin penetration process is still incomplete, leaving porosities on the micro- and nano-scale within the hybrid layer that weaken dentin bonding[10]. Nanoleakage was originally described as leakage at nanometer-sized channels, which can occur within the hybrid layer and/or in the adhesive layer. This phenomenon has been widely implicated as an important factor that causes degradation of the bonding to dental tissue[11,12,13]. The aim of this study was to verify the effectiveness of subpressure technique on dentin-bonding properties using the total-etching adhesive system
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