Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

New electronic canal measuring device based on the ratio method

C Kobayashi1, H Suda

  • 1Department of Endodontics, Faculty of Dentistry, Tokyo Medical and Dental University, Japan.

Journal of Endodontics
|March 1, 1994
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Proof-of-Principle Experiment for Testing Strong-Field Quantum Electrodynamics with Exotic Atoms: High Precision X-Ray Spectroscopy of Muonic Neon.

Physical review letters·2023
Same author

Resection of the external iliac artery with axillofemoral bypass for local recurrence of rectal cancer.

Techniques in coloproctology·2021
Same author

Deexcitation Dynamics of Muonic Atoms Revealed by High-Precision Spectroscopy of Electronic K X Rays.

Physical review letters·2021
Same author

r-Process elements from magnetorotational hypernovae.

Nature·2021
Same author

Extremely metal-poor stars from the cosmic dawn in the bulge of the Milky Way.

Nature·2015
Same author

Root surface strain during canal shaping and its influence on apical microcrack development: a preliminary investigation.

International endodontic journal·2014
Same journal

Clinical Outcome of Replanted Avulsed Anterior Teeth: A Retrospective Cohort Study.

Journal of endodontics·2026
Same journal

Mahidol study 3: Post-operative Effect and Adverse Events of Regenerative Endodontic Procedures in Immature Permanent Teeth.

Journal of endodontics·2026
Same journal

Non-Surgical Management of Horizontal Root Fracture with Necrotic Apical Segment and Coronal Cervical Abfraction Using Mineral Trioxide Aggregate: Case Report.

Journal of endodontics·2026
Same journal

Identification of pain-related biomarkers and the associated potential molecular regulation mechanism in pulpitis by bioinformatics method.

Journal of endodontics·2026
Same journal

AI Prognostic Models in Endodontics: Scoping Review and Clinical Gap Analysis for Retreatment vs Microsurgery Decision Support.

Journal of endodontics·2026
Same journal

AI-based 3D measurement of root canal curvature from CBCT: Validation of an automated Schneider angle analysis.

Journal of endodontics·2026
See all related articles

This study introduces a new electrical root canal length measurement device. It accurately determines file tip position, unaffected by electrolytes, overcoming limitations of current apex locators.

Area of Science:

  • Biomedical Engineering
  • Endodontics
  • Electrical Impedance Measurement

Background:

  • Conventional apex locators struggle with electrolyte interference, leading to inaccurate or impossible root canal length measurements.
  • Electrolytes in the root canal can significantly affect the readings of existing apex locators, posing a clinical challenge.

Purpose of the Study:

  • To develop and evaluate a novel electrical device for measuring root canal length that overcomes the limitations of current apex locators, particularly regarding electrolyte interference.
  • To assess the accuracy and reliability of a new impedance-based method for determining the apical constriction position.

Main Methods:

  • A new device was developed that simultaneously measures two canal impedances using dual-frequency current sources.
  • The ratio of electric potentials, proportional to each impedance, was calculated and displayed as the file tip's position.

Related Experiment Videos

  • The influence of electrolytes on the measurement quotient was investigated, along with its behavior as the file tip approached the apex.

    • Main Results:

    • The developed device's measurement quotient showed negligible influence from electrolytes present in the root canal.
    • A significant decrease in the quotient was observed as the file tip approached the apical foramen, indicating accurate localization.
    • The new method demonstrated improved reliability compared to conventional apex locators in the presence of electrolytes.

    Conclusions:

    • The novel dual-frequency impedance-based device offers a promising solution for accurate root canal length determination, even in the presence of electrolytes.
    • This technology has the potential to enhance the precision and success rate of endodontic treatments by providing reliable apical localization.
    • Further clinical validation is warranted to confirm the widespread applicability of this advanced apex locator technology.