Abstract
Aim: To evaluate the long-term post push-out bond strength to dentin, water sorption, solubility and swelling of conventional and self-adhesive dual-cure resin cements. Methods: Forty-eight bovine roots were prepared for fiber post cementation with RelyX ARC and RelyX U100. According to resin cement and storage time (24 h and 6 months), 4 groups were assessed using the push-out test. Water sorption and solubility were performed according to ISO 4049:2009. The swelling coefficient was obtained using cement disks of each material immersed in distilled water until the swelling equilibrium was reached. The mass of dry and swelled polymer and solvent density were used to calculate the coefficient. Statistical data analysis was performed using Student’s t-test for water sorption, solubility and swelling coefficient and the Kruskal-Wallis and Dunn multiple comparison tests for push-out analysis with a significance level of 0.05. Results: The immediate bond strength was not significantly different between RelyX ARC (3.09 MPa) and RelyX U100 (3.78 MPa) (p>0.05). RelyX U100 showed higher (p 0.05) between groups. The swelling coefficient of the RelyX U100 group was significantly higher than that of the RelyX ARC group (p<0.05). Conclusions: RelyX U100 resin cement showed a higher swelling coefficient than RelyX ARC, and the longitudinal push-out bond strength increased after six months. Clinical significance: The clinical longevity of restorative treatment in root-filled teeth is dependent on the long-term properties and behavior of the cement used for post luting. Results of this study suggest that the selfadhesive resin cement may be a reliable alternative.
Highlights
Fiber posts are widely used to restore endodontically treated teeth as an alternative to metal posts and cores
The similarity in the elastic modulus among the fiber post, resin cement and dentin is advantageous for the improved performance of restorative procedures[1]
The working length was established by the direct method subtracting 1 mm from the real root length, determined by introducing a no 10 K-file (Maillefer-Dentsply, Ballaigues, Switzerland) until the file was visible through the apical foramen
Summary
Fiber posts are widely used to restore endodontically treated teeth as an alternative to metal posts and cores. The similarity in the elastic modulus among the fiber post, resin cement and dentin is advantageous for the improved performance of restorative procedures[1]. The chemical nature of the posts allows them to be bonded to canal walls with adhesive systems in combination with resin cements. The choice of a luting agent depends on the clinical situation and on the material’s physical, biologic and handling properties. 247 Swelling of self-adhesive resin cement increases long-term push-out bond strength of fiber post to dentin and chemical substances to start the polymerization reaction. Variation in the content of these components strongly influences the physicochemical properties of the material[2]
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