Push-out strength of translucent fibre posts cemented using a dual-curing technique or a light-curing self-adhering material.

Aim: Comparing by means of the push out test the interfacial strength of a dual-curing resin cement and a light-curing self-adhering resin composite when used in translucent fiber post cementation. Methodology: Thirty-four endodontically treated single canal extracted human bicuspids were selected. Translucent fiber posts (RelyX Fiber Post) were luted into the root canal using two resinous luting systems (n=17). Dual Curing Technique (DC): the specimens were treated with Excite DSC and RelyX ARC, which were light-cured simultaneously through the post for 60s. Light-Curing Self-Adhering Technique (LCSA): the specimens were treated with Vertise Flow, which was light-cured through the post for 60s. The specimens were transversally sectioned into six slices in order to perform the push-out test at coronal, middle and apical region of the root canals. Data were analyzed by two-way ANOVA. All specimens were analysed at stereomicroscope and SEM. Results: At any region of the root canal, results did not show any statistical difference between the DC and LCSA techniques (p=0.703), and “root region” was not a significant factor for push-out strength (p=0.255). Group-region interactions were not statistically significant (p=0.740) either. For DC technique the majority of the fracture patterns (73.3%) were adhesive at the interface between dual-curing resin cement and adhesive. For LCSA technique the majority of the fracture patterns (71.7%) were adhesive at the interface between light-curing self-adhering resin composite and dentin. Conclusions: The interfacial strength between light-curing self-adhering resin composite and root canal is equivalent to the interfacial strength between dual-curing cement and root canal.