Silane and Adhesive Influence on Fiber Post-Composite Bond Strength

Objectives: To evaluate the influence of adhesive and silane aplication on microtensile bond strength of a composite resin to sandblasted fiber posts. Methods: 18 epoxy resin-based fiber posts (DT Light Post, RTD) were used in the study. Posts were sandblasted (Rocatec-Pre, 3M ESPE) and divided into three groups, according to the surface treatment performed. Group 1: silane application (RelyX Ceramic Primer, 3M ESPE); 2: adhesive application (Adper Scotchbond 1 XT, 3M ESPE); 3: no treatment. Resin composite (Filtek Supreme, 3M ESPE) was applied on the posts to produce cylindrical specimens. Specimens were cut to obtain microtensile sticks that were loaded in tension at a cross-head speed of 0.5 mm/min until failure. Statistical analysis was performed with Kruskal–Wallis analysis of variance followed by Dunn's multiple range test (p<0.05). Results: Bond strength on silane treated posts was not significantly different than on posts that received no treatment. Adhesive application resulted in fiber post-composite bond strength that was significantly higher in comparison to no treatment and silane application (Table). Conclusions: Adhesive application improved adhesion to sandblasted epoxy resin-based quartz fiber posts. Silane application had no influence on post-composite bond strength.

Table: Post-cement microtensile bond strength [MPa] ¹

¹Numbers are means. Values in brackets are standard deviations. Different letters indicate statistically significant differences.