Immediate and delayed photoactivation of self-adhesive resin cements and retention of glass-fiber posts

• Published in: Brazilian oral research Vol. 28; no. 1; pp. 1 - 6
• Main Authors: Faria-e-Silva, André Luis, Peixoto, Aline Carvalho, Borges, Marcela Gonçalves, Menezes, Murilo de Sousa, Moraes, Rafael Ratto de
• Format: Journal Article
• Language: English; Portuguese
• Published: Brazil Sociedade Brasileira de Pesquisa Odontológica - SBPqO 2014; Sociedade Brasileira de Pesquisa Odontológica
• Subjects: Analysis of Variance; Animals; Cattle; Composite Resins - chemistry; Dental Bonding; Dental Prosthesis Retention - methods; Dental Pulp Cavity - drug effects; Dental Restoration Failure; Dentin - drug effects; Dentin-Bonding Agents - chemistry; Dentistry; DENTISTRY, ORAL SURGERY & MEDICINE; Glass - chemistry; Light-Curing of Dental Adhesives - methods; Materials Testing; Polymerization - radiation effects; Post and Core Technique; Reproducibility of Results; Resin Cement; Resin Cements - chemistry; Time Factors; Post and Core Technique; Dental Bonding; Resin Cement
• ISSN: 1806-8324; 1807-3107; 1807-3107
• DOI: 10.1590/S1806-83242014.50000005

The aim of this study was to evaluate the effect of immediate and delayed photoactivation of self-adhesive resin cements (SARCs) on the retention of glass-fiber posts luted into root canals. Bovine incisors were endodontically treated, and post holes of 9 mm in depth were prepared. Fiber posts were luted using one of two SARCs, BisCem (Bisco Inc., Schaumburg, USA) or RelyX Unicem clicker (3M ESPE, Saint Paul, USA), or a regular (etch-and-rinse) resin cement (AllCem; FGM, Joinvile, Brazil). Photoactivation was performed immediately, or at 5 or 10 min after cementation. Root/post specimens were transversely sectioned 7 days after luting into 1-mm-thick slices, which were submitted to push-out testing in a mechanical testing machine. Bond strength data were analyzed by two-way ANOVA and Student-Newman-Keuls' method (α = 0.05). Immediate photoactivation resulted in the highest bond strength for Unicem. BisCem demonstrated higher bond strength values when photoactivated after a 10-min delay. Immediate photoactivation yielded the lowest bond strengths for AllCem, although no differences in bond strength were observed between photoactivation delayed by 5 and 10 min. In conclusion, the moment of resin cement photoactivation may affect the intraradicular retention of fiber posts, depending upon the resin cement used for luting.