Effect of Surface Pretreatment and Thermal Activation of Silane Coupling Agent on Bond Strength of Fiber Posts to Resin Cement
CH Archana, S Murali Krishna Raju, Sarjeev S Yadhav, Sita RK Manthena, Prathuri R Teja
Fiber post, Sandblasting, Shear bond strength, Silanization, Thermal activation
Citation Information :
Archana C, Raju SM, Yadhav SS, Manthena SR, Teja PR. Effect of Surface Pretreatment and Thermal Activation of Silane Coupling Agent on Bond Strength of Fiber Posts to Resin Cement. J Contemp Dent Pract 2019; 20 (11):1293-1296.
Introduction: For the restoration of grossly decayed root canal treated teeth, posts are used frequently to retain core for the definitive restoration. Therefore, it is necessary to create adequate adhesion at the post–root-cement interface for long-term performance of a post retained restoration.
Aim: To establish the outcome of surface pretreatments such as silanization, sandblasting, and silanization followed by thermal activation of fiber posts on bonding with a dual-cured adhesive resin-based cement.
Materials and methods: Eighty radiopaque, No #2 glass fiber-reinforced epoxy resin posts (Hi-Rem Posts, Overfibers, Switzerland), posts were wiped with alcohol (surgical spirit, 90% alcohol) for 5 seconds in a single stroke. A cylindrical plastic cap of diameter 10 mm and length of 15 mm, which is closed on one side, was selected. This was duplicated to form molds and fiber posts embedded perpendicularly in the polyester resin, and samples were made. Samples were randomly distributed into four groups based on the pretreatment done and each group contains 20 samples, group I—(control), group II—(silanization), group III—(sandblasting), and group IV—(thermal treatment of silane). After surface treatment, exposed post surface was uniformly coated with dual-cured resin cement. Cement was cured for 40 seconds with a halogen lamp. The samples are subjected to load in a universal testing machine (UTM) at a crosshead speed of 1.0 mm/minutes to evaluate the bonding failure at the interface.
Results: Group IV resulted in the highest bond strength values followed by group III. Group II showed a comparatively higher value than group I but less than groups III and IV.
Conclusion: Surface treatment procedure, on fiber post by silanization and sandblasting significantly improved adhesion between post and luting cement interface.
Clinical significance: The surface pretreatment, such as sandblasting, silanization, thermal activation of silane coupling agents significantly improved, the retention of the post within in the root canal system.
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