Effect of dentin cleansing techniques on the shear bond strength of self-adhesive resin cement after temporary bonding with two provisional cements
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Abstract
Objective: The objective of this study was to evaluate the effect of different cleansing techniques on the shear bond strength of self-adhesive cement to dentin after temporary fixation with two provisional cements.
Materials and Methods: Ninety human premolars were sectioned horizontally and embedded in self-cured acrylic resin blocks. Self-cured acrylic discs were fixed on the dentin surfaces with two provisional cements, zinc oxide non-eugenol temporary cement (TempBond NE) or temporary resin-based cement (TempBond Clear). The specimens were stored in distilled water at 37˚C. After 5 d, the provisional restorations were removed and randomly divided into 5 groups (n=10), based on cleansing treatments: no temporary cement (control group), explorer, prophy brush with pumice, rubber cup with pumice, and ultrasonic scaler. Self-adhesive cement (RelyX U200, 3M ESPE) was applied into a metal mold (3 mm diameter, 2 mm thick), which was placed on the dentin surfaces and polymerized with a light-emitting diode curing unit for 40 sec. The specimens were stored in distilled water at 37 ˚C for 24 h. The shear bond strength test was performed with a universal testing machine at a crosshead speed of 0.5 mm/min until failure. The data were analyzed using two-way analysis of variance (ANOVA) and post-hoc Dunnett T3 test.
Results: There were no significant differences in shear bond strength between the two types of temporary cement and cleansing methods (p=0.105 and 0.083, respectively). The control group presented a significantly higher shear bond strength compared with the prophy brush with pumice and rubber cup with pumice in TempBond NE groups (p=0.001 and 0.005, respectively). The control group also had a significantly higher shear bond strength compared with the explorer (p=0.004) in TempBond Clear group.
Conclusion: Cleansing methods and types of temporary cements did not affect the shear bond strength of self-adhesive resin cement and dentin. However, cleaning temporary resin-based cement with an explorer generated the significantly lowest shear bond strength in the TempBond Clear group.
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