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Related Experiment Videos

Temperature evolution on human teeth root surface after diode laser assisted endodontic treatment.

Norbert Gutknecht1, Rene Franzen, Jörg Meister

  • 1AALZ, c/o Klinik für Zahnerhaltung, Parodontologie und Präventive Zahnheilkunde, Universitätsklinikum der RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany.

Lasers in Medical Science
|July 12, 2005
PubMed
Summary

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This study determined safe laser usage times for root canal treatments. Exceeding specific irradiation durations with an 810-nm diode laser can cause excessive root surface temperature rise.

Area of Science:

  • Endodontics
  • Biomedical Engineering
  • Laser Dentistry

Background:

  • Laser-assisted root canal treatment utilizes diode lasers for disinfection and debris removal.
  • Understanding thermal effects is crucial to prevent root surface damage during endodontic procedures.
  • An 810-nm diode laser is commonly used, necessitating investigation into its thermal threshold.

Purpose of the Study:

  • To investigate the thermal rise threshold on the root surface using an 810-nm semiconductor diode laser in vitro.
  • To establish safe irradiation parameters for laser-assisted root canal treatment.
  • To identify maximum irradiation times to maintain root surface temperature below a critical threshold.

Main Methods:

  • Fifty human single-rooted teeth were prepared to ISO#50 apical size.

Related Experiment Videos

  • Laser irradiation was performed using an 810-nm diode laser with six different power output, pulse length (PL), and interval duration (ID) settings.
  • Temperature changes at the outer root surface were measured using NiCr-Ni sensors and a thermometer after laser application.

    • Main Results:

    • A safe temperature increase threshold of 7°C was established for the outer root surface.
    • Specific maximum irradiation times were determined for various laser settings to stay below the 7°C threshold.
    • For example, 20s at 0.6-1W (10ms PL/10ms ID) and 5s at 1-1.5W CW were found to be safe.

    Conclusions:

    • Safe irradiation times for 810-nm diode laser use in root canals vary based on power, pulse length, and interval duration.
    • Adhering to these identified irradiation times is essential to prevent detrimental thermal effects on the root surface.
    • This research provides critical data for optimizing laser parameters in endodontic therapy.