Shear Bond Strength of Quartz Fiber Reinforced Composite Posts by Microwave Surface Treatment
The objective of this study was to evaluate shear bond strengths of core buildup composite resin -quartz fiber-reinforced composite posts, the surface treatment by 10% hydrogen peroxide with and without microwave irradiation. Twentyseven fiber posts were randomly divided into 9 groups, 3 posts in each group. All posts were cut into two portions, the first portions (12 pieces) were tested for shear bond strength while the rest portions were used to evaluate surface roughness using atomic force microscope. In shear bond strength testing, 12 posts were only immersed in 10% hydrogen peroxide for 20 min, 60 sec, 90 sec, 120 sec respectively (group 1, 5, 6, and 7). The other 9 posts were immersed in the same solution under microwave irradiation for 60 sec, 90 sec, 120 sec respectively (group 2, 3, and 4). After the treatment, all posts were rinsed and coated with silane coupling agent. For group 8, the posts were only coated with silane coupling agent and no surface treatment was applied to the posts in group 9 (control group). Core buildup composite resin were fabricated on the posts in each group, then sectioning for 1mm-thick specimens. These specimens were tested for shear bond strength using push-out test with cross-head speed 0.5 mm per minute. In surface roughness testing, two pieces of the posts in each group were randomly selected and evaluated for the surface roughness using atomic force microscope. Two-way ANOVA revealed that group 1 and 2 achieved highest shear bond strength (P<0.05). After surface treatment, the exposure of quartz fiber had more effectiveness in increasing shear strength than surface roughness of fiber post.
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