IADR Abstract Archives

Push-out Bond Strength and SEM Evaluation of Adhesive Root Fillings

Objectives: The purpose of this study was to compare the interfacial strengths and failure modes of polymeric endodontic obturation systems consisting of different material combinations.

Methods: A total of 105 extracted human single-rooted teeth were used. All teeth were instrumented using HERO Shaper rotary instruments. Irrigation was performed with 15 mL of 1.25% NaOCl and 5 mL of 17% EDTA. The canal spaces were filled with different combinations of core and sealer as follows: group-1, RealSeal/Resilon; group-2, RealSeal/HeroFill; group-3, Hybrid-Root-Seal/Resilon; group-4, Hybrid-Root-Seal/Herofill; group-5, MM-Seal/Resilon; group-6, MM-Seal/Herofill; group-7 (control), Herofill only. Cylinders of root dentine 1.00 ± 0.05-mm-thick were prepared from the coronal sections of teeth. The test specimens were subjected to the push-out test method. After adhesion testing, the remaining sections were examined under stereomicroscope at ×40 magnification and scanning electron microscopy to determine the nature of bond failure. All data were analyzed by the Kruskal-Wallis nonparametric test followed by the Dunn test (P<0.05).

Results: The respective mean push-out test values for groups 1 to 7 were: 3.184 ± 2.166 MPa, 1.425 ± 1.257 MPa, 3.437 ± 2.074 MPa, 1.337 ± 1.475 MPa, 1.958 ± 0.849 MPa, 2.663 ± 1.511 MPa, and 0.104 ± 0,071 MPa. Hybrid-Root-Seal/Resilon combination (group-3) had significantly (P<0.001) greater bond strength than all the other groups; group-2 (Realseal/Herofill) and group-4 (Hybrid-Root-Seal/Herofill) were not significantly different from each other, but both had significantly (P<0.001) lower bond strength than all the other groups. Realseal/Resilon combination (group-1) proved to have second highest bond strength (P<0.001). Inspection of the surfaces revealed that the bond failure to be mainly mixed failure in both adhesive and cohesive modes at the dentin/sealer interface.

Conclusions: The push-out bond strengths of methacrylate-based sealers (Hybrid-Root-Seal and Realseal) and thermoplastic synthetic-polymer-based core material (Resilon) combinations were higher than epoxy-resin-based sealer (MM-Seal) and gutta-percha (Herofill) combination.


Pan European Federation Meeting
2008 Pan European Federation Meeting (London, England)
London, England
2008
897
PEF IADR 2008
  • Önay, Emel Olga  ( Baskent University, Ankara, N/A, Turkey )
  • Üngör, Mete  ( Baskent University, Ankara, N/A, Turkey )
  • Ari, Hale  ( Selcuk Universitesi, Konya, N/A, Turkey )
  • Belli, Sema  ( University of Selcuk, Konya, N/A, Turkey )
    • Oral Session
    Materials - Endodontics
    09/12/2008