EFFECT OF BONDING TECHNIQUES AND SOLVENT TYPE ON THE BOND STRENGTH OF DIFFERENT ADHESIVES TO DENTIN

Authors

1 Operative Dept, Faculty of Dentistry, Al-Azhar University, Boys, Cairo

2 Operative Dept, Faculty of Dentistry, Al-Azhar University, Assyout

Abstract

Contemporary total etch adhesives contain ethanol/water or acetone as solvent in which resin monomers are dissolved. Solvent
type of the adhesive system has an important role in bonding to dentin. An adhesive containing tertiary butanol as an alternative
solvent has been in the market. This study determined the effect of two bonding techniques on the dentin shear bond strength of
three total etch adhesives with different solvents (acetone, ethanol or tertiary butanol).
Sixty extracted non-carious human third molars were divided into three main groups according to solvent type of the adhesives;
One-Step (OS - Bisco, Schaumburg, IL, USA), an acetone-based system, Single Bond (SB - 3M/ESPE, St. Paul, MN, USA), an
ethanol-based system and XP Bond (XP, Caulk/Dentsply, DE, USA), tertiary butanol-based system. Each main group was divided
into two groups according to bonding technique, moist (conventional) or treated with 10% sodium hypochlorite for deproteinization)
(n = 10).
After acid-etching and rinsing, medium occlusal dentin surfaces of human molars were kept moist (conventional) or were
treated with 10% sodium hypochlorite for deproteinization. After applying adhesives over the dentin, composite cylinders were
built up and submitted to shear testing. Data were analyzed by Student’s t test and Tukey HSD test. (p < 0,05).
Tertiary butanol based adhesive showed higher bond strength values than ethanol or acetone based adhesives. Deproteinization
of dentin increased the bond strength (p < 0.05).

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