Brazilian Oral Research
On-line version ISSN 1807-3107
EL-ASKARY, Farid Mohammed Sabry et al. Effect of surface area and air-drying distance on shear bond strength of etch-and-rinse adhesive. Braz. oral res. [online]. 2012, vol.26, n.5, pp.418-423. Epub July 19, 2012. ISSN 1807-3107. http://dx.doi.org/10.1590/S1806-83242012005000013.
We evaluated the effects of air-drying distance and bond surface area on the shear bond strength of a 2-step etch-and-rinse adhesive. A total of 120 bovine anterior teeth were equally divided into 6 main groups based on bonding surface area. The main groups were divided into sub-groups (n = 5) according to air-drying distance. The shear strength was determined using a universal testing machine at a crosshead speed of 0.5 mm/min. The averaged results were subjected to two-way ANOVA and Tukey's test (α = 0.05). Two-way ANOVA testing identified no significant cross-product interactions (p > 0.05), but the main factors of area (p < 0.0001) and air-drying distance (p < 0.00001) significantly affected the mean bond strength. Shorter air-drying distances improved bond strength, and increased surface area decreased the bond strength.
Keywords : Dentin-Bonding Agents; Shear Strength; Material Testing.