0346 In vitro Microtensile Dentin Bond Strength of Adhesives by Classification
C. THUNPITHAYAKUL, D.S. COBB, G. DENEHY, F. QIAN, and S. ARMSTRONG, University of Iowa, Iowa City, USA

OBJECTIVE: The immediate purpose of this study is to compare the early in vitro microtensile dentin bond strength (µTBS) of dental adhesives with the long-term objective to compare bond durability as measured by drop in µTBS over 6 months storage to annualized failure rates from clinical Class V trials (Peumans et al, 2005, Dent Mater; 21: 464-481).

METHODS: Occlusal dentin surfaces of 80 extracted caries-free human molars were flattened with CNC specimen former (University of Iowa) to apply four adhesives of each class of adhesive systems (3-step etch-and-rinse: Adper Scotchbond Multi-Purpose, All-Bond 2, OptiBond FL, Permaquik, 2-step etch-and-rinse: Adper Single-Bond Plus, One Step, Prime & Bond NT, Solobond M, 2-step self-etch: Clearfil Liner Bond 2V, Clearfil SE Bond, Probond, Syntac, 1-step self-etch: Adper Prompt L-Pop, Futurabond, iBond, Xeno III, and glass-ionomers: Fuji Bond LC, Fuji II LC, Ketac Fil, Vitremer). Resin-based composite (Z100, 3M ESPE) was built up to approximately 6-mm in height within dentin margins. One hour after bonding, the composite build-up was sectioned into four sticks and trimmed into cylindrical hourglass specimens with a cross-sectional area of 0.5 mm2. Two specimens from each tooth were tested at a cross head speed of 1 mm/min. The remaining specimens were stored in artificial saliva at 37°C for 6 months testing.

RESULTS: Results from one-way ANOVA and Post-hoc Tukey's studentized range indicated that immediate mean µTBS of 3-step etch-and-rinse and 2-step etch-and-rinse were significantly higher than those observed in the other three adhesive groups, and mean µTBS of 2-step self-etch was significantly higher than those observed in 1-step self-etch, and glass-ionomers. However, there were no significantly difference between 3-step etch-and-rinse and 2-step etch-and-rinse, as well as, between 1-step self-etch and glass-ionomers.

CONCLUSION: Within the limitation of this in vitro study, 3-step etch-and-rinse should still be considered to be the gold standard.

Seq #70 - Bond Strength of Composites to Enamel and Dentin with Self-etching Adhesives
2:00 PM-3:15 PM, Thursday, March 22, 2007 Ernest N. Morial Convention Center Exhibit Hall I2-J
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