Nd : YAGレーザー照射に対する歯の熱光学的反応を応用した新しい齲蝕検査法

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It has been confirmed by the spectral analyses on dental structures that carious dental structure absorbe the Nd : YAG laser beam much more but transmits and reflects it much less than normal dental structures. The authors' basic experiment has revealed the interesting phenomenon that he optical and the thermal reaction on carious dental structures to the Nd : YAG laser beam is essentially different from that of normal denta structures depending on their optical characteristics. The result of this experiment hopefuly suggested the possibility of the dental caries detection applying the photo-thermal reaction on teeth against the laser irradiation, and this study was designed to realize the suggestion in the basic experiment. The basic method of the dental caries examination applied in this experiment was as follows : When a tooth crown surface was exposed to a very weak pulsed Nd-YAG laser shot as to feel no pain, the lased surface temperature of the tooth and the transmission intensity of the laser beam through the tooth were measured, and the data were recorded simultaneously on a multipen recorder. Comparative analysis on the data of carious teeth with that of normal teeth has revealed the dramatic result that carious teeth were clearly differentiated from normal teeth, and the decayed area was also able to be observed with real-time thermography. This method is superior to conventional roentgenographic diagnosis of dental caries because of its complete safety and its high sensitivity for so fine primary caries that can not be detected by radiographic examination. It is fully expected that this technique may lead to an exciting new diagnostic technique for dental caries.
日本医療機器学会の論文
1990-02-01

Nd : YAGレーザー照射に対する歯の熱光学的反応を応用した新しい齲蝕検査法

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