The Comparison of Ethyl-Alcohol-Wet Bonding Techniques on the Shear Bond Strength of Resin Cements; An in vitro Study
Aims: The aim of this in vitro study was to assess the shear bond strengths of hydrophobic and hydrophilic resin cements to dentin, after application of ethyl-alcohol-wet and water-wet bonding techniques. Materials and Methods: Seventy flat dentin surfaces were etched, rinsed, blot-dried, and kept moist before applying the water-wet bonding technique. In addition to these procedures, the surfaces were re-wetted with 100% ethanol solution for 30 seconds for the application of the ethanol-wet bonding technique. They were then bonded with adhesives. After construction of resin composite build-ups with resin cements, the specimens were held in water for 1 day. An Instron device was used to measure bond strength and environmental scanning electron microscopy (ESEM) was used to evaluate dentin surfaces treated with adhesive. Analysis of variance (ANOVA) and the three factor with interaction model were used for statistical analysis. Results: The mean bonding values of the experimental groups generally were statistically insignificant (P>.05). However, resin cement–ethanol interaction was significant (P= .027). According to ESEM images, it was clear that the groups with high bond strength values had more resin in the dentinal tubules. Conclusion: Higher bond strengths were achieved when dentin was bonded with ethanol with hydrophobic resins, or when dentin was bonded moist with water with hydrophilic resins.