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Wet versus dry enamel ablation by Er:YAG laser
1Department of Oral Pathology, University of North Carolina, Chapel Hill.
The Journal of Prosthetic Dentistry
|June 11, 1992
Summary
Pulsed Er:YAG laser irradiation of teeth with a water mist efficiently ablates enamel and dentin. This method minimizes pulpal temperature increases, unlike dry laser application, making it safer for dental procedures.
Area of Science:
- Dentistry
- Biomedical Engineering
- Laser Physics
Background:
- The Er:YAG laser is a potential tool for dental procedures.
- Understanding its effects on tooth structure and temperature is crucial for clinical application.
Purpose of the Study:
- To investigate the impact of a pulsed Er:YAG (2.94 microns) laser on extracted human tooth structure.
- To measure intrapulpal temperature changes during laser irradiation under different conditions.
Main Methods:
- Extracted human teeth were irradiated with a pulsed Er:YAG laser.
- Two teeth were tested dry, and three were tested with a fine water mist.
- Scanning Electron Microscopy (SEM) was used to analyze surface morphology.
- Intrapulpal temperature was monitored using a thermal sensor.
Main Results:
- Dry laser irradiation resulted in minimal enamel ablation, surface melting, cracking, and a significant intrapulpal temperature rise (>27°C).
- Laser irradiation with a water mist efficiently ablated enamel and dentin, showing fissures and craters.
- Water mist application led to a minimal average intrapulpal temperature increase (4°C).
Conclusions:
- Pulsed Er:YAG laser with a water mist effectively removes tooth structure.
- This technique avoids significant pulpal temperature elevation, suggesting a safer clinical profile.