Push-out bond strength and SEM evaluation of new polymeric root canal fillings

Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2009 Jun;107(6):879-85. doi: 10.1016/j.tripleo.2009.01.023. Epub 2009 Apr 22.


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

Study design: Extracted human single-rooted teeth (n = 105) were instrumented using HERO Shaper rotary instruments and obturated 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). Failure modes of root slices (1.00 +/- 0.05-mm thick) after push-out testing were examined with stereomicroscope and scanning electron microscopy.

Results: Hybrid Root Seal/Resilon combination had significantly greater bond strength than all the other groups (P < .001); RealSeal/Resilon combination proved to have the second highest bond strength (P < .001). Bond failure was mainly mixed failure in both adhesive and cohesive modes at the dentin/sealer interface.

Conclusion: 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.

Publication types

  • Comparative Study

MeSH terms

  • Composite Resins / chemistry*
  • Dental Bonding*
  • Dental Pulp Cavity / ultrastructure
  • Dental Restoration Failure
  • Dental Stress Analysis
  • Humans
  • Root Canal Filling Materials / chemistry*
  • Root Canal Obturation*
  • Stress, Mechanical


  • Composite Resins
  • Real Seal composite resin
  • Root Canal Filling Materials
  • resilon sealer