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Related Experiment Videos

[Apical electrical resistance: parametric study of its variations].

E Vackey, G Lemagnen, J Rougé

    Revue D'Odonto-Stomatologie
    |November 1, 1989
    PubMed
    Summary

    This study found electronic apex locators lack reliability for measuring root canal working length. Apical resistance measurements vary significantly due to electrochemical conditions, impacting accuracy.

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    Protection of oligodeoxynucleotides against nuclease degradation through association with self-assembling peptides.

    Biomaterials·2007

    Area of Science:

    • Endodontics
    • Biomedical Engineering
    • Dental Materials

    Context:

    • Electronic apex locators (EALs) are widely used in endodontic therapy.
    • Accurate determination of root canal working length is crucial for successful treatment.
    • Previous studies have indicated potential variability in EAL performance.

    Purpose:

    • To statistically analyze variations in apical resistance measurements using EALs.
    • To evaluate the reliability of precalibrated and standardized instruments for working length determination.
    • To investigate the influence of electrochemical pathological conditions on apical resistance.

    Summary:

    • Thirty-one clinical cases were analyzed, quantifying apical resistance in ohms.
    • Pulpal pathology and irrigant types were systematically recorded.

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  • Electronic endodontic measurements, converted from electrical signals, were radiographically controlled.
  • Analysis revealed a lack of reliability in current EALs for precise working length measurement.
  • An "ohms drop" was observed at the apical constriction, influenced by canal and periapical electrochemical conditions.

    • Impact:

    • Highlights the limitations of existing electronic devices for accurate working length assessment.
    • Suggests that electrochemical factors significantly affect apical resistance readings.
    • Underscores the need for improved or alternative methods for reliable working length determination in endodontics.