Comparison of Bonding Efficiency Between Flowable Composite Core and Fiber-reinforced Composite Post Which Surface Treatment with Silane Coupling Agent and Plasma Jet
The purpose of this study was to investigate the bond strength of fiber-reinforced composite post to flowable composite core build-up material after air plasma jet surface treatment. Fifty six DT Light-Post® were divided into 4 groups according to surface treatment: i. untreated surface group (control), ii. silane coupling agent treated surface group, iii. air mixed with helium plasma jet treated surface group, and iv. air mixed with argon plasma jet treated surface group. The coronal parts of the fiber posts were encapsulated with flowable composite core build-up material. The specimens were immersed in distilled water at 37°C for 24 hours. All specimens were pull-out tests by using a universal testing machine to evaluate the tensile-shear bond strength of the specimens in each group (n = 8). Profilometer and scanning electron microscope were used to examine the surface roughness and surface morphology in the non-encapsulated flowable composite posts (n= 2). Fourier transform infrared spectroscopy was used to measure the functional group in the posts after surface treatments (n=2). One-way ANOVA and Tamhane’s multiple comparisons test revealed that there were no significant differences in tensile-shear bond strengths among each group (p=0.05). No significant differences were found in the surface roughness of all post specimens with Tukeyís test (p = 0.05).
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