Push-out bond strengths of two fiber post types bonded with different dentin bonding agents (Retracted article. See vol. 100, pg. 1458, 2012)

Abstract

The aim of this study was to evaluate the regional push-out bond strengths for two fiber-reinforced post types using three different dentin bonding agents Sixty single-rooted extracted human first premolar teeth were sectioned below the cemento-enamel junction, and the roots were endodontically treated Following standardized post space preparations, the roots were divided into two fiber-post groups (Glassix (R) and Carbopost (R)), and further divided into three subgroups of 10 specimens each for the bonding systems self-etching dentin bonding agents (Clearfil (TM) SE Bond and Optibond (R) all-in-one), and total-etching dentin bonding agent (XP Bond (TM)) A dual-cure resin luting cement (Maxcem (TM)) was then placed in the post spaces and posts were then seated into the root canals polymerized through the cervical portion The roots were then cut into 3-mm thick sections Push-out tests were performed at a crosshead speed of 0 5 mm/min. The data were analyzed with multivariate ANOVA (alpha = 0 05) The morphology of interface between different dentin bonding agents from the cervical sections were analyzed with SEM Glass fiber-reinforced posts demonstrated significantly higher push-out bond strengths than carbon fiber-reinforced posts (p < 00011 Bond strength values decreased significantly from the cervical to the apical root canal regions (p < 0 001) Self-etching dentin adhesive Clearfil SE Bond and total-etching dentin adhesive XP Bond demonstrated similar bond strengths values and this was significantly higher compared with the Optibond (R) all-in-one in cervical root canal region In conclusion, in all root segments, the glass fiber-reinforced posts provided significantly increased post retention than the carbon fiber-reinforced posts, regardless of the adhesive used (C) 2010 Wiley Periodicals, Inc J Biomed Mater Res Part B Appl Biomater 938 359-366, 2010