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Temperature elevation on the root surface during Nd:YAG laser irradiation in the root canal
1School of Dentistry, College of Medicine, National Taiwan University, Taipei, Republic of China.
Journal of Endodontics
|May 13, 1999
Summary
Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) laser irradiation in root canals can cause harmful heat. Safe root canal temperatures were observed only with laser energy below 100 mJ/pulse and 20 pulses/s.
Area of Science:
- Endodontic Therapy
- Dental Laser Applications
- Biomedical Engineering
Background:
- Nd:YAG lasers offer potential benefits in endodontics, including dentinal tubule sterilization and sealing.
- Concerns exist regarding heat generation during laser irradiation, potentially harming adjacent tissues.
Purpose of the Study:
- To evaluate temperature elevation on the root surface during Nd:YAG laser irradiation within the root canal.
Main Methods:
- 90 single-rooted teeth had their apical thirds irradiated with a pulsed Nd:YAG laser.
- Laser parameters varied: 50-200 mJ/pulse energy and 20-30 pulses/s.
- Root surface temperature elevation was measured concurrently.
Main Results:
- Temperature increase remained below 10°C under specific conditions.
- Safe temperature levels were achieved with laser energy output under 100 mJ/pulse and a pulse rate of 20 pulses/s.
Conclusions:
- Nd:YAG laser use in endodontics requires careful parameter control to prevent thermal damage.
- Low energy (under 100 mJ/pulse) and pulse frequency (under 20 pulses/s) are critical for maintaining safe root surface temperatures.