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Related Experiment Videos

[A comparative study of root smear layer removal using different pH EDTA salts].

Rui Ma1, Zheng Liu, Cai-lian Zhu

  • 1Department of Stomatology, Shanghai Ninth People's Hospital, Shanghai, 200011, China. marui66@hotmail.com

Shanghai Kou Qiang Yi Xue = Shanghai Journal of Stomatology
|December 10, 2003
PubMed
Summary

This study found that a combination of 15% ethylenediaminetetraacetic acid (EDTA) at pH 6.5 with 25% sodium hypochlorite and 3% hydrogen peroxide effectively removed root canal smear layers. This irrigation strategy proved most successful in coronal and middle root thirds.

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Area of Science:

  • Endodontics
  • Dental Materials Science
  • Biomaterials

Background:

  • Smear layer removal is crucial for effective endodontic treatment.
  • Ethylenediaminetetraacetic acid (EDTA) is commonly used, but its efficacy can be influenced by pH.
  • Optimizing irrigation solutions can improve root canal cleaning and disinfection.

Purpose of the Study:

  • To compare the effectiveness of different pH ethylenediaminetetraacetic acid (EDTA) salts in removing root canal smear layers.
  • To evaluate the impact of combining EDTA with sodium hypochlorite and hydrogen peroxide on smear layer removal.
  • To determine the optimal irrigation protocol for comprehensive smear layer elimination.

Main Methods:

  • Sixty human single-rooted teeth were instrumented using the step-back technique.

Related Experiment Videos

  • Teeth were irrigated with various solutions, including saline, NaOCl + H2O2, and 15% EDTA at pH 6.5 and pH 13, with and without NaOCl + H2O2.
  • Root canal walls were analyzed using scanning electron microscopy (SEM) at coronal, middle, and apical thirds.

    • Main Results:

    • Saline and NaOCl + H2O2 alone showed limited smear layer removal.
    • 15% EDTA at pH 6.5 was more effective than at pH 13 (P < 0.05).
    • The combination of 15% EDTA (pH 6.5), 25% NaOCl, and 3% H2O2 demonstrated the highest smear layer removal efficacy in coronal and middle thirds, but not in the apical third.

    Conclusions:

    • The combination of 15% EDTA (pH 6.5) with 25% NaOCl and 3% H2O2 is the most effective irrigation regimen for smear layer removal in the coronal and middle root canal thirds.
    • Further research may be needed to address smear layer removal in the apical third.
    • Optimized irrigation protocols are essential for successful endodontic outcomes.