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Effect of cyclic loading on bonding of fiber posts to root canal dentin
Author(s) -
Albaladejo Alberto,
Osorio Raquel,
Aguilera Fatima S.,
Toledano Manuel
Publication year - 2008
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.31014
Subject(s) - dentin , stereo microscope , materials science , adhesive , bond strength , root canal , composite material , composite number , universal testing machine , dentistry , ultimate tensile strength , medicine , layer (electronics)
Abstract This study evaluated the effect of mechanical loading on microtensile bond strength (MTBS) when luting fiber posts to root canal dentin. Forty maxillary premolars were endodontically treated, and the roots were prepared for post cementation using the FRC Postec system. A light‐cured composite (Clearfil Photo Core, Kuraray) was used in combination with four adhesive systems: Single Bond (3 M ESPE), Multilink Primer (Vivadent), Clearfil Photo Bond (Kuraray), and Clearfil New Bond (Kuraray). A composite build‐up was performed around the root to provide adequate gripping during testing. For each experimental group, half of the specimens were load cycled under 90 N (5000 cycles, 3 cycles/s). Specimens were cut to obtain beams with the post in the center and with the radicular dentin overlaid by the composite build‐up on each side. Microtensile testing was performed with a universal testing machine at a cross‐head speed of 0.5 mm/min. The failure mode was classified under a stereomicroscope. ANOVA and Student–Newman–Keuls multiple comparison tests were performed. After 24 h, all adhesives performed similarly. When specimens were subjected to mechanical loading, decreases in MTBS were observed for Clearfil New Bond and Multilink Primer. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2008