Objective: This project investigates the effects of two major factors on shear bond strength (SBS). The two factors were substrate, enamel or dentin, and product. Three dentin bonding agent (DBA) were tested: PQ1 (self-priming), Liner Bond SE (self etching) and Prompt-L-Pop (self etching/self priming). The hypotheses that there a significant association between the two factors and SBS was tested at a 5% confidence level. Methods: 60 teeth were sectioned buccal-lingually. Six groups of 20 specimens each were created by random assignment. Groups were E-P1, D-P1 E-LBS, D-LBS, E-PLP and D-PLP, with E- and D- signifying dentin and enamel specimens and products identified by P1 (PQ1), LBS (Liner Bond SE) and PL (Prompt-L-Pop). A 2.4mm diameter column of composite (Z100 Shade LVA1) 3.0mm high was bonded to the tooth. Specimens were stored 24 hours at 37 C before testing. Testing was done at a crosshead speed of 0.5mm/second. The load at failure was recorded in MPa. Results: For groups E-P1, E-LBS and E-PLP the mean SBS was 29.0 + 9.5, 24.4 + 5.6, 24.0 + 7.0 respectively. For dentin it was 29.5 + 7.6, 25.8 + 9.9, 23.9 +10.8 for D-P1, D-LBS and D-PLP respectively. There was a significant difference between the three DBAs (2-Factor ANOVA; p < 0.017). The ranking was P1 > PLP; P1 = LBS; LBS = PLP (Tukey's). For each of the three products, there was no significant difference between enamel and dentin specimens. Comparing dentin to enamel specimens, there was no significant difference. Conclusion: Although there was a statistically significant difference between the three products there was no significant difference between the shear bond strength for enamel versus dentin specimens in general or for any of the individual DBAs.

Back to the Dental Materials: I - Adhesion-Composite Bond Strength Program
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