Reliability of fiber post bonding to root canal dentin after simulated clinical function in vitro

K. Bitter, Jorge Perdigao, M. Exner, K. Neumann, A. M. Kielbassa, G. Sterzenbach

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The aim of this study was to investigate the effect of thermomechanical loading (TML) on the bond strength of fiber posts luted with three different resin cements. Sixty-six extracted human anterior teeth were endodontically treated and restored with fiber posts (RelyX Fiber Posts, 3M ESPE) using three commercially available resin cements and three corresponding core build-up materials (n=22 each): Panavia F 2.0/Clearfil DC Core Automix (Kuraray), Variolink II/Multicore Flow (Ivoclar Vivadent), and RelyX Unicem/Filtek Z250 (3M ESPE). Twelve specimens of each group received all-ceramic crowns and were subjected to TML. The other 10 specimens were stored in saline solution for 24 hours. The roots were sectioned and bond strength was measured using a push-out test. Adhesive interfaces of two specimens of each group subjected to TML were analyzed using field emission scanning electron microscopy (FES-EM). Bond strengths of fiber posts were significantly affected by the type of resin cement (p<0.0005) and TML (p<0.0005; two-way analysis of variance). TML significantly reduced bond strengths for all materials ((6.0 (6.2) MPa)) compared with initial bond strengths ((14.9 (10.4) MPa)). RelyX Unicem resulted in significantly higher bond strengths before ((18.3 (10.3) MPa)) and after TML ((9.8 (7.5) MPa)) compared with the other materials (p<0.0005; Tukey HSD). Using FESEM, Variolink II and Panavia F demonstrated a hybrid layer partly detached from the underlying resin cement, whereas no hybrid layer was observed for RelyX Unicem. The decrease in bond strength after TML suggests that retention of fiber posts may be reduced after clinical function. Therefore, endodontically treated teeth that are restored using fiber posts may benefit from additional reinforcement via coronal restorations using adequate ferrules and/or adhesive techniques.

Original languageEnglish (US)
Pages (from-to)397-405
Number of pages9
JournalOperative dentistry
Volume37
Issue number4
DOIs
StatePublished - Jul 1 2012

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Resin Cements
Dental Pulp Cavity
Dentin
Nonvital Tooth
Adhesives
Ceramics
Crowns
Sodium Chloride
Electron Scanning Microscopy
Analysis of Variance
In Vitro Techniques
Rely X Unicem
Panavia-Fluoro
Variolink

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Reliability of fiber post bonding to root canal dentin after simulated clinical function in vitro. / Bitter, K.; Perdigao, Jorge; Exner, M.; Neumann, K.; Kielbassa, A. M.; Sterzenbach, G.

In: Operative dentistry, Vol. 37, No. 4, 01.07.2012, p. 397-405.

Research output: Contribution to journalArticle

Bitter, K. ; Perdigao, Jorge ; Exner, M. ; Neumann, K. ; Kielbassa, A. M. ; Sterzenbach, G. / Reliability of fiber post bonding to root canal dentin after simulated clinical function in vitro. In: Operative dentistry. 2012 ; Vol. 37, No. 4. pp. 397-405.
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