Aging and thermocycling effects on adhesion of fiber posts to human radicular dentin

Abstract

Aim: This in vitro study evaluated the effect of different aging periods and thermocycling on the adhesion of fiber posts to human dentin at different depths. Methods: Twenty teeth were cleaned, decoronated, and endodontically treated. After one week, root filling was removed and a 10-mm post space was prepared. Posts (RelyX™ Fiber size 2) were cemented with a self-adhesive resin cement (RelyX™ Unicem) and light cured. Specimens (n=4, each) were stored in 100% humidity (0 day, 7 days, 1 month, 3 months) or thermo-cycled (at 7 days, 10,000 cycles, 5-55C°, 30 s). Four 1-mm-thick sections were obtained from each tooth and a push-out test was performed and results compared. Results: There was a significant difference (ANOVA p0.05). Conclusions: Long-term storage of test samples affected the bond strength of fiber posts to radicular dentin variably, and should be considered as part of invitro testing.

Keywords

• Adhesion
• Fiber post
• Push-out test
• Radicular dentin
• Storage
• Thermocycling