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Effects of Mechanical Methods Used in Peri-implantitis Treatment on Implant Surface Decontamination and Roughness
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Effects of Mechanical Methods Used in Peri-implantitis Treatment on Implant Surface Decontamination and Roughness

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Does endodontic post space irrigation affect smear layer removal and bonding effectiveness?

Xin-Hua Gu1, Cai-Yun Mao, Cong Liang

  • 1Department of Stomatology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China.

European Journal of Oral Sciences
|September 18, 2009
PubMed
Summary
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Ethylenediaminetetracetic acid (EDTA) effectively removed the smear layer, significantly improving dentin bond strength in endodontically treated teeth. This highlights the importance of irrigant selection for effective post-endodontic bonding.

Area of Science:

  • Endodontics
  • Dental Materials Science
  • Biomaterials

Background:

  • Effective post-endodontic treatment requires optimal adhesion between the post, luting agent, and dentin.
  • The smear layer, a debris layer formed during post space preparation, can impede bonding.
  • Different irrigants are used to clean root canals, but their effect on smear layer removal in post spaces needs clarification.

Purpose of the Study:

  • To evaluate the efficacy of different post space irrigants in removing the smear layer.
  • To assess the impact of these irrigants on dentin bond strength.
  • To investigate the influence of irrigants on resin tag formation and the resin-dentin interdiffusion zone (RDIZ).

Main Methods:

  • Sixty-six endodontically treated maxillary central incisors were prepared for post space.

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  • Teeth were irrigated with 17% ethylenediaminetetracetic acid (EDTA), 5.25% sodium hypochlorite (NaOCl), or 0.9% sodium chloride (NaCl).
  • Smear layer removal, bond strength (push-out test), resin tag formation, and RDIZ were evaluated using SEM and mechanical testing.

    • Main Results:

    • EDTA demonstrated superior smear layer removal compared to NaOCl and NaCl.
    • EDTA significantly enhanced dentin bond strength in all root regions (apical, middle, coronal).
    • Irrespective of the irrigant, smear layer removal positively correlated with improved bond strength, resin tag formation, and RDIZ.

    Conclusions:

    • The choice of post space irrigant critically affects smear layer removal and subsequent dentin bond strength.
    • EDTA is highly effective in removing the smear layer, leading to improved adhesion with self-etching luting systems.
    • Thorough smear layer removal is crucial for achieving effective and durable bonding in post-endodontic restorations.