Abstract
BackgroundThis study evaluated the effect of three different silanes and post-silanization treatments on the retentive strength of fiber posts luted with an etch-and-rinse resin cement.Material and MethodsOne hundred intact maxillary central incisors were randomly divided into 10 groups after endodontic treatment and post space preparation (n=10). The fiber posts were etched using 24% hydrogen peroxide. Posts of the control group did not receive silane. In nine experimental groups, each of the three silanes used, Scotchbond Universal adhesive, Bis-Silane and Porcelain Primer, was subjected to three treatments: air-drying at 25°C, warm air-drying and CO2 laser heat treatment. After cementation of the treated posts using One-Step Plus/Duo-Link cement, the specimens were stored for one weak and then subjected to pull-out bond strength (PBS) testing. The data in Newton (N) were analyzed using two-way ANOVA and Tukey tests (α=0.05).ResultsPBS was significantly affected by silane type and post-silanization treatment (p<0.001). The interaction of the two factors was not statistically significant (p=0.15). The effect of Porcelain Primer on PBS was significantly higher than those of universal adhesive (p<0.001) and Bis-Silane (p=0.01), with similar results for the two latter. Warm air-drying and laser treatment significantly increased PBS (p<0.001). The lowest and highest PBS was obtained in the control (no silane) group (190.9±31) and laser-treated/ Porcelain Primer group (377.1±50), respectively.ConclusionsWarm air-drying and CO2 laser heat treatment had a significantly beneficial effect on retentive strength of fiber posts. Porcelain Primer was significantly more effective than universal adhesive and Bis-Silane. Key words:Laser heat treatment, Pull-out bond strength, fiber post.
Highlights
Use of fiber-reinforced composite post (FP) has increased to provide retention for the final restoration in endodotically treated teeth [1]
In the adhesively cemented post, a bonded unit among post, adhesive system/resin cement and root dentin is achieved through adequately strong bond at the post‒cement and cement‒dentin interfaces [2]
FPs can well benefit from the silanization for resin bonding if their glass fibers are exposed and available for formation of siloxane bonds with silane [2,3,4]
Summary
Use of fiber-reinforced composite post (FP) has increased to provide retention for the final restoration in endodotically treated teeth [1]. A 1-minute application of 24% and 50% H2O2 exposed glass fibers for chemical bonding and provided spaces for penetration of the resin adhesive [7], increasing bond strength of the resin to the silane-treated undamaged FPs [3,4]. In Scotchbond Universal, methacryloxydecyl phosphate monomer and silane coupling agent are combined, enabling bonding to different substrates such as silica-based ceramics [13] It might be used in lieu of silane on FPs surface due to the bonding ability to the exposed glass fibers. Conclusions: Warm air-drying and CO2 laser heat treatment had a significantly beneficial effect on retentive strength of fiber posts. Porcelain Primer was significantly more effective than universal adhesive and Bis-Silane
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