Microtensile bond strength of a dual-cure resin core material to glass and quartz fibre posts

Objectives. To evaluate the microtensile bond strength (muTBS) of a dual-cure resin core material to different regions of fibre posts using different surface treatments. Materials and Methods. Twenty-five silica zirconium glass fibre posts (Snowpost) and 25 quartz fibre posts (Aestheti-Plus) were used and randomly divided into five groups according to the surface treatments: (1) no surface treatment (Control) (2) dual-cure bonding agent, Clearfil Liner Bond 2V (LB) (3) LB followed by light curing for 20 s (LB and C) (4) silane coupling bonding agent agent, Clearfil. Photobond with Porcelain Bond Activator (PB + PBA) (5) PB + PBA followed by light curing for 20 s (PB + PBA and LC). Treated posts were cemented into artificial post cavities using a dual-cure composite core material. (Clearfil, DC Core) and cured for 60 s from the top of the cavity. After 24 h storage in water, each specimen was serially sliced into 8, 0.6 x 0.6 mm(2)-thick beams for the muTBS test. The data were divided into three regions (upper/middle/bottom) and analyzed using three-way ANOVA and Dunnet's T3 multiple comparisons (alpha = 0.05). Results. There were no significant differences in bond strength between the three regions (p > 0.05). The bond strengths were enhanced by the application of a silane coupling agent. For Snowpost, photoirradiation of the dual-cure bonding agent applied to the post surface significantly improved the bond strength (p < 0.05), whereas it did not affect the bond strength of Aestheti-Plus post (p > 0.05). Conclusion. The bond strength between fibre post and dual-cure resin core material depends upon the type of post and surface treatment. There were no regional differences in muTBS of the bonded post. (C) 2004 Elsevier Ltd. All rights reserved.