Fried D, Glena R E, Featherstone J D, Seka W
University of California, San Francisco 94143-0758, USA.
Lasers Surg Med. 1997;20(1):22-31. doi: 10.1002/(sici)1096-9101(1997)20:1<22::aid-lsm4>3.0.co;2-0.
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.
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.
These changes resulted in increased energy coupling during irradiation.
有效利用激光进行预防性牙科治疗需要准确了解照射过程中沉积的激光能量的数量和分布。在二氧化碳波长下，反射损失相当大，会减少组织表面吸收的激光能量。
研究设计/材料与方法：在二氧化碳激光的10.6、10.3、9.6和9.3微米波长下测量牙釉质和牙本质的镜面反射和漫反射。研究了激光照射期间和照射后的反射率变化。
钙化牙组织在二氧化碳波长下的低通量反射率（<1 J/cm²）在9%至50%之间变化。在较高照射强度下会引起反射率的永久性和暂时性变化。
这些变化导致照射期间能量耦合增加。
