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0465 Self-etch adhesive bond strength
at two time intervals Materials and Methods: Molar and premolar teeth were mounted in acrylic and ground to expose adequate dentin surface for bonding. Dentin surfaces were roughened with 320 grit Si-C paper. The teeth were randomly separated into two groups to be bonded with either a) Simplicity or b) One Step. Adhesives were applied per manufacturer's instructions. A bonding mold (inside diameter: 2.3798 mm) was positioned onto the flat dentinal surface, the adhesive was light cured, and Z100 composite was placed into the mold until the cylinder was ½ full. The composite was cured according to manufacturer's instructions, and the mold was removed. Samples were then separated into two groups: 1) tested immediately after bonding 2) tested 7days after bonding. The samples were shear tested using a notched shear apparatus in an Instron Model 4202 with a crosshead speed of 1 mm/min. A Paired samples t-test was used to determine significance between groups. Results: The average shear bond strengths for Simplicity and One Step tested immediately and after 7 days are shown below: Immediate testing Simplicity 28.5 MPa (±6.6) One Step 25.3 MPa (±4.6) 7days Simplicity 33.7 MPa (±6.8) One Step 29.2 MPa (±4.9) Results: There was no statistically significant difference between Simplicity and One Step when the samples were tested immediately after bonding (p=0.2281). Simplicity achieved a bond strength statistically greater than One Step when tested 7 days after bonding (p=0.0435). Conclusion: Simplicity compares favorably to One Step when tested for shear bond strength immediately after bonding and seven days after bonding
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