Influência da hibridização prévia a cimentação temporária na resistência de união de pinos de fibra de vidro à dentina radicular

Abstract

The aim of this study was to evaluate the influence of resin coat prior temporary cementing on bonding strength of fiber post to root dentine. Seventy-eight bovine tooth were sectioned and roots 15 mm in length were treated endodontically and prepared to receive the post. Sixty roots were used for mechanical testing of micro push-out, being that in a group the Clearfil SE Bond was applied before the temporary cementation to prepare the dentin, while while in the other group the Clearfil SE Bond before temporary cementation was not applied. Three types of temporary cement for fixation of temporary restorations were, are: calcium hydroxide cement-based, zinc oxide and eugenol cement-based and zinc oxide without eugenol cement-based. After 07 days, the temporary restorations were removed and the root canals were cleaned. The post were treated with 35% hydrogen peroxide and silanized. The post were cemented with self-adhesive cement Rely X U200. The seating of the post was five minutes and the excess was removed after the first 60 seconds. After the outer covering of the roots with the molding material, the samples will be photoactivated for 40 seconds on each surface. The roots were stored for 24 hours and then sectioned into slices for mechanical test micro push-out and analysis of the fracture pattern. Eighteen samples were used for evaluation through confocal laser scanning microscopic to analyze penetration and distribution of the resin cement and adhesive system. Data were analyzed by two-way ANOVA and Tukey test. The results showed that there was no statistically significant interaction between the use of a sealing agent and temporary cement (P = 0.375), excluding root thirds. In conclusion, the use of a sealing agent prior to the temporary cement did not result in higher bond strength of fiber post to the root dentin.