Effect of silane activation on shear bond strength of fiber-reinforced composite post to resin cement

Abstract

PURPOSEAmong the surface treatment methods suggested to enhance the adhesion of resin cement to fiber-reinforced composite posts, conflicting results have been obtained with silanization. In this study, the effects of silanization, heat activation after silanization, on the bond strength between fiber-reinforced composite post and resin cement were determined.MATERIALS AND METHODSSix groups (n=7) were established to evaluate two types of fiber post (FRC Postec Plus, D.T. Light Post) and three surface treatments (no treatment; air drying; drying at 38℃). Every specimen were bonded with dual-curing resin cement (Variolink N) and stored in distilled water for 24 hours at 37℃. Shear-bond strength (MPa) between the fiber post and the resin cement were measured using universal testing device. The data were analyzed with 1-way ANOVA and by multiple comparisons according to Tukey's HSD (α=0.05). The effect of surface treatment, fiber post type, and the interactions between these two factors were analyzed using 2-way ANOVA and independent sample T-tests.RESULTSSilanization of the FRC Postec Plus significantly increased bond strength compared with the respective non-treated control, whereas no effect was determined for the D.T. Light Post. Heat drying the silane coupling agent on to the fiber-reinforced post did not significantly improve bond strength compared to air-syringe drying.CONCLUSIONThe bond strength between the fiber-reinforced post and the resin cement was significantly increased with silanization in regards to the FRC Postec Plus post. Bond strength was not significantly improved by heat activation of the silane coupling agent.

Effects of hydrogen peroxide pretreatment and heat activation of silane on the shear bond strength of fiber-reinforced composite posts to resin cement

“…Many authors have studied the effects of silanization on the bonding between fiber posts and resin adhesives, reporting significant improvements in bond strength. 4 12 19 On the other hand, Choi et al 3 expected silanization to play only a minor role in increasing bond strength, and similar results were also found by several other investigators. 9 11 In our study, the positive effects of the silane coupling agent on shear bond strength between the fiber post and resin cement were identified by comparing the results of Group 1 (the untreated control group) and Group 2 (the silane-treated group without any additional surface pretreatment), and the difference between the two groups was statistically significant ( P < 0.05).…”

“…This finding is consistent with the previous studies reporting silane agent as an effective factor for fiber post bonding to resin cement. The mean values different from those in the studies by Choi et al 3 and Kim et al 19 are probably due to the different adhesive bonding systems and resin cements used. The other two studies used a dual-polymerizing resin cement (Variolink II; Vivadent AG, Schaan, Liechtenstein) and reported slightly higher bond strengths for the silanated groups than that of this study.…”

“…Most of the previously mentioned studies reported that the silanated post surfaces were dried at or around 38℃; on the other hand, heat treatment in our study was performed at 80℃. All the previous studies, including the study of Kim et al 19 arguing against the effect of post-silanization heat treatment on bond strength, used a blow dryer on warm air stream mode to heat-activate the silane agent around 38℃. However, this kind of method for heat activation is quite technique-sensitive and the desired temperature cannot be easily controlled and maintained during the process, thereby resulting in a non-homogeneous environment for specimen preparation within the same study and between different studies.…”

Effects of Silane on the Push-out Bond Strength of Fiber-reinforced Resin Posts luted with different Self-adhesive Resin Cements

“…Studies prove that silanization improves the bond strength between the fiber posts and the resin cements. 8 Dentin is a dynamic tissue that changes with age, due to caries and restorative procedures. The histological structure of dentin also alters regionally from the coronal down to the apical portion.…”

“…6,7 Failure of fiber post restored teeth occurs mainly due to debonding of the post at the post-cementation junction. 8 Many factors can affect the retention of the post within the root canal. A few of the aforementioned factors include the type of post, adhesive and cementation system, operative procedures, and the configuration of the root system.…”