Bond Strength of Fiber Posts to Composite Core: Effect of Surface Treatment With Er,Cr:YSGG Laser and Thermocycling

Abstract

Introduction: This study aimed to determine the bond strength of fiber post to composite core following surface treatment with Er,Cr:YSGG laser at different powers and sandblasting with and without thermocycling. Methods: In this experimental study, 30 fiber posts (Glassix, Nordin, Switzerland) were randomly divided into 5 groups of sandblasting, no treatment and laser irradiation at 1, 1.5 and 2 W powers. Following composite filling and mounting, 1-mm thick sections were made for pushout bond strength testing. Half of the samples in each group were subjected to thermocycling (n=15). Two-way analysis of variance (ANOVA) was used to analyze the bond strength values. Pairwise comparisons were made using Tukey test (P < 0.05). Results: Effect of treatment method on push-out bond strength of fiber post to composite core was significant (P = 0.017), while thermocycling had no significant effect on bond strength (P = 0.964). Pairwise comparison of surface treatment methods revealed no significant difference in groups with and without thermocycling (P > 0.05), but Er,Cr:YSGG laser irradiation with 1 W power yielded significantly higher bond strength than the control group (P =0.01). Conclusion: Irradiation of Er,Cr:YSGG laser at 1 W power increased the bond strength of fiber post to composite core. Thermocycling slightly decreased the bond strength at the fiber postcore interface.

Effects of motion direction and power of Er,Cr:YSGG laser on pull-out bond strength of fiber post to root dentin in endodontically-treated single-canal premolar teeth

“…Gomes et al reported that irradiation of Er,Cr:YSGG laser with 2780 nm wavelength, 150 mJ energy, 10 Hz frequency, 1.5 W power, 140 μs pulse duration and 60% water and 40% air for 60 s in non-contact mode increased the push-out bond strength of fiber posts [17]. Hashemikamangar et al evaluated the effect of surface treatment of fiber posts with Er,Cr:YSGG laser and demonstrated that irradiation of Er,Cr:YSGG laser with 1.0 and 1.5 W power, 20 Hz frequency, 140 μs pulse duration in non-contact mode with 80% water and 60% air for 30 s enhanced the micro-push-out strength of fiber posts [30]. Kurtulmus-Yilm et al reported that irradiation of Er,Cr:YSGG laser with 1.0 and 1.5 W power, 20 Hz frequency, 140 μs pulse duration and 80% water and 60% air for 30 s in non-contact mode increased the push-out bond strength of fiber posts [31].…”

In Vitro Fracture Resistance of Endodontically Treated Premolar Teeth Restored with Prefabricated and Custom-Made Fibre-Reinforced Composite Posts

“…Moreover, the strength and fracture load decreased by about 18%. Hashemikamangar et al claimed that no significant effect was detected after the thermocycling process on pushing-out bond strength between the fiber posts and resin core [ 40 ]. Moreover, the bond strength values in the thermocycled samples were slightly lower than the values in the nonthermocycled samples.…”

Effect of Different Surface Treatments on the Light Transmission and Adhesion of Two Types of Glass Fiber Posts

“…The effects of application of hydrofluoric acid within different concentrations and on post have been investigated (12). It has been shown that the concentration of 4% (13) and 5% of acid gel for 60sec increased the bond of post .the concentration of 9.5 of HF used by Some authors (14,15) for 20sec, this results in increasing the bonding strength . In this study, 9.6 % acid was added to types of post.…”