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Dentin strain induced by laser irradiation.

Satoshi Watanabe1, Hidetoshi Saegusa, Tomoo Anjo

  • 1Pulp Biology and Endodontics, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan. s.watanabe.endo@tmd.ac.jp

Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc
|July 30, 2010
PubMed
Summary
This summary is machine-generated.

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Laser irradiation of root canals can induce strain in dentin. Er:YAG laser with water cooling causes less strain than Nd:YAG laser, but insufficient cooling risks root micro-fractures.

Area of Science:

  • Endodontics
  • Biomaterials Science
  • Laser Dentistry

Background:

  • Laser technology is increasingly used in endodontic treatments.
  • Understanding the thermal and mechanical effects of laser irradiation on root dentin is crucial for clinical safety.
  • Potential risks include dentin strain and micro-fracture.

Purpose of the Study:

  • To investigate dentin strain and temperature changes during laser irradiation of human root canals.
  • To compare the effects of Er:YAG and Nd:YAG lasers with and without water cooling.
  • To assess the risk of root micro-fracture associated with laser use.

Main Methods:

  • Human maxillary first molar root segments were used (n=28).
  • Strain gauges measured dentin strain on the apical third.

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  • Thermocouples monitored dentin temperature changes near the apex.
  • Er:YAG and Nd:YAG lasers were applied at 1 W for 5 seconds, with and without water cooling.

    • Main Results:

    • With water cooling, Er:YAG laser induced significantly less mean maximum strain than Nd:YAG laser (P < 0.05).
    • Without water cooling, no significant difference in strain was observed between the two lasers (P > 0.05).
    • Temperature changes were monitored but not detailed in the abstract.

    Conclusions:

    • Er:YAG laser irradiation with adequate water cooling appears to minimize dentin strain.
    • Insufficient water cooling during laser treatment poses a potential risk of root micro-fracture.
    • Careful application and effective cooling are essential when using lasers in endodontics.