Nd: YAGレーザー照射後のエナメル質及び象牙質の変化に対する照射出力及び反応剤の影響 : 蒸散量及び表面微細構造の変化に関して

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The purpose of this study is to examine the effects of laser energy and the amount of reactant (carbon marker) on the transpiration rate of enamel and dentin under laser irradiation over a fixed time. The following findings were obtained. 1. The transpiration of enamel and dentin increased with the laser energy. This tendency was more remarkable when laser energy in excess of 700mJ was used, especially in the enamel. 2. There was also a positive correlation between concentration of reactant and transpiration rate. Substantial increases were seen in both the width and depth of cavities with 100% of reactant compared with cases of 50% of reactant. Irradiation without reactant showed no transpiration. 3. A slightly rougher surface at the irradiated area than that of the non irradiated area was observed after irradiation at low energy (100mJ). Both non-uniform and smooth parts were seen on the surface. With irradiation at medium energy (300mJ), some porous structure was seen depending on the observed area. At the highest irradiation energy (900mJ), many cavities were seen after a considerable loss of enamel and their boundary was surrounded by a smooth surface structure, which was formed by the melting of enamel. 4. With irradiation applied to dentin, many micro holes had formed on the surface and nonuniform and an aquam-like structure was observed at high magnification. The number of micro holes increased with irradiation energy and this sponge like structure was also observed in samples which used higher energy.
福岡歯科大学学会の論文
2006-09-25

Nd: YAGレーザー照射後のエナメル質及び象牙質の変化に対する照射出力及び反応剤の影響 : 蒸散量及び表面微細構造の変化に関して

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