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 2662 Effect of storage on bond strength of a self-etching
adhesive Materials and Methods: Human molar teeth were embedded in autopolymerizing acrylic and ground to expose adequate dentin and enamel surfaces for bonding. The teeth were randomly separated into 10 groups, five dentin and five enamel, to be bonded with Simplicity. Each group consisted of ten samples. The adhesive was applied per manufacturer's instructions. Sample fabrication was done according to the Ultradent method. The adhesive was light cured and then the bonding mold (inside diameter: 2.3798 mm) was positioned and Z100 composite inserted and light-cured. Samples were then separated into five groups: 1) tested immediately after bonding, 2) tested 2 hours after bonding, 3) tested 24 hours after bonding 4) tested 30 days after bonding, and 5) tested 6 months after bonding. Teeth were stored in distilled water at 37 degrees Centigrade. The samples were subjected to shear testing using a Universal testing machine with a notched shear blade and a crosshead speed of 1 mm/min. Load at failure was recorded in Newtons and converted into shear bond strength in MPa. Results: Shear bond results were: Immediate Dentin (d) 27.6 (+/- 2.9), Immediate enamel (e) 25.8 (+/- 1.6); 2 hour (d) 37.4 (+/- 1.9), (e) 37.8 (+/- 3.7); 24 hour (d) 38.2 (+/- 2.6), (e) 37.2 (+/- 3.4) ; 30 day (d) 37.5 (+/- 3.0), (e) 36.7 (+/- 3.7); 6 month (d) 35.5 (+/- 2.3), (e) 36.1 (+/- 3.2). The immediate values were significantly lower than for any other period, but the other groups were not statistically different from each other. Conclusion: The shear bond strengths of Simplicity were storage stable
over the immersion period.
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