Permanent and transient changes in the reflectance of CO2 laser-irradiated dental hard tissues at λ = 9.3, 9.6, 10.3, and 10.6 μm and at fluences of 1–20 J/cm2
✍ Scribed by Fried, Daniel; Glena, Richard E.; Featherstone, John D. B.; Seka, Wolf
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 400 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0196-8092
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✦ Synopsis
Background and objective:
Effective use of lasers for preventive dental treatments requires accurate knowledge of the amount and distribution of laser energy deposited during irradiation. at co2 wavelengths, the reflection losses are considerable and reduce the laser energy absorbed by the tissue surface.
Study design/materials and methods:
The specular and diffuse reflectance of enamel and dentin were measured at the 10.6-, 10.3-, 9.6-, and 9.3-microns wavelengths of the co2 laser. changes in reflectance during and after laser irradiation were investigated.
Results:
The low-fluence reflectance (< 1 j/cm2) of calcified dental tissues at co2 wavelengths varies between 9% and 50%. permanent and transient changes in the reflectance are induced at higher irradiation intensities.
Conclusion:
These changes resulted in increased energy coupling during irradiation.