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Related Experiment Videos

Smear layer removal by root canal irrigants. A comparative scanning electron microscopic study

R Garberoglio1, C Becce

  • 1Department of Conservative Dentistry, School of Dentistry, University of Siena, Italy.

Oral Surgery, Oral Medicine, and Oral Pathology
|September 1, 1994
PubMed
Summary

Six endodontic irrigants were tested for smear layer removal. Phosphoric-citric acid and 3% or 17% ethylenediaminetetraacetic acid effectively removed smear layers, unlike sodium hypochlorite or 0.2% ethylenediaminetetraacetic acid.

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Area of Science:

  • Dentistry
  • Endodontics
  • Materials Science

Background:

  • Smear layer removal is crucial for effective endodontic treatment.
  • Various irrigants are used, but their efficacy varies.

Purpose of the Study:

  • To evaluate the effectiveness of six endodontic irrigants in removing smear layers.
  • To compare the smear layer removal efficacy of sodium hypochlorite, phosphoric-citric acid, and ethylenediaminetetraacetic acid solutions.

Main Methods:

  • In vitro evaluation of 53 root canals using scanning electron microscopy.
  • Testing of 1% and 5% sodium hypochlorite, 24% phosphoric acid/10% citric acid, and 0.2%, 3%, 17% ethylenediaminetetraacetic acid solutions.

Main Results:

  • Sodium hypochlorite solutions were ineffective in smear layer removal.

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  • 0.2% ethylenediaminetetraacetic acid showed limited efficacy.
  • Phosphoric-citric acid, 3% and 17% ethylenediaminetetraacetic acid demonstrated significant smear layer removal without significant differences between them.
  • Acidic solutions exhibited a more pronounced demineralizing effect on dentinal walls.

    • Conclusions:

    • Phosphoric-citric acid and higher concentrations of ethylenediaminetetraacetic acid are effective for smear layer removal in endodontics.
    • Sodium hypochlorite and low-concentration ethylenediaminetetraacetic acid are less effective.
    • Consideration of demineralizing effects is important when selecting endodontic irrigants.