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Influence of cross-head speed on resin-dentin shear bond strength
A T Hara1, L A Pimenta, A L Rodrigues
1Department of Restorative Dentistry, School of Dentistry of Piracicaba, University of Campinas, Av. Limeira 901, Caixa Postal 52, Piracicaba, Brazil.
Objective:
To evaluate the influence of different cross-head speeds on shear bond strength test on the dentin surface.
Methods:
One hundred and twenty extracted bovine incisors were embedded in polystyrene resin. The specimens were prepared by wet grinding with 320-, 400- and 600-grit Al2O3 paper exposing dentin. After the application of the adhesive system Single Bond (3M) to etched dentin, the composite resin Z-100 (3M) was applied and light cured. The specimens were randomly assigned to four groups (n=30). The shear bond strength tests were performed with an EMIC DL 500 universal testing machine at four different cross-head speeds: 0.50 (A); 0.75 (B); 1.00 (C); and 5.00 mm/min (D).
Results:
The mean values of shear bond strength in MPa (SD) were: A, 11.78 (3.91); B, 11.82 (4.78); C, 16.32 (6.45); D, 15.46 (5.94). The data were analyzed with one-way ANOVA and Tukey's test (alpha=0.05). The results indicated that A=B
Significance:
Different cross-head speeds may influence the shear bond strength and the fracture pattern in dentin substrate. Shear bond strength using cross-head speeds of 0.50 and 0.75 mm/min should be preferred.