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KMID : 1157520070030010049
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International Journal of Clinical Preventive Dentistry
2007 Volume.3 No. 1 p.49 ~ p.60
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SEM findings on Er: YAG Laser irradiation at early caries lesions of tooth enamel
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Choi Won-Ki
Shin Seung-Chul
Cho Ja-Won
Shin Kun-Chul
Bok Seng-Bem
Jung Ho-Young
Park Ji-Hyon
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Abstract
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Objectives: The authors has irradiated Er:YAG laser on tooth enamel with early caries lesions in order to eliminate the caries lesions by changing the energy power and pulse rate on the extracted 14 molar teeth. Methods: Each sample was irradiated energy power as 50 mJ, 200 mJ and 300 mJ respectively applied and pulse rate as 5 Hz, 10 Hz, 15 Hz and 20 Hz were used, and thermal changes at each situation was monitored. SEM was exposed as x50 and x1,000 to observe the changes of the enamel surfaces to find the optimum energy and pulse rate to apply in clinical. Results: There was no difference in enamel changes of early caries lesions between on experimental groups and the control groups, through the irradiation with 50 mJ of the energy power. The strips phenomena obviously was shown by increasing the pulse rate of laser irradiation as 10, 15 and 20 Hz, to early caries lesions with 200 mJ of energy power and observed by SEM findings with x1,000. The strips phenomena on the enamel surface in experimental groups were shown obviously by increasing of the pulse rate with 300 mJ of energy power for laser irradiation, but it was shown the destruction phenomena of enamel surface, even though more elimination of caries lesion, on 20 Hz of the pulse rate. The more duration of laser irradiation, the more elimination of early caries lesion and strip phenomena, on 20 mJ of energy power, by SEM observation with x1,000. The temperature changes were within 3℃ as tolerance ranges of thermal changes in clinical use, in all experimental groups. Conclusion: It was recommended that 2 W to 4.5 W as the optimum ranges of the energy power for clinical use of Er:YAG laser, in order to use for elimination of early such treatment as sealant or fluoride would be recommended to apply after laser irradiation on the purpose of rough surface control.
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KEYWORD
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laser, SEM
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