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KMID : 0355420090330030346
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Journal of Korean Academy of Oral Health
2009 Volume.33 No. 3 p.346 ~ p.355
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Optimal wavelength selection for laser ablation of dental caries
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Roh Jung-Hoon
Jeon Gye-Rok
Park Tae-Yong
Kim Seong-Sik
Kim Jin-Bom
Kim Ji-Young
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Abstract
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Objective: The purpose of this study was to find out the optimal wavelength of turnable lasers for selective ablation of surface enamel caries.
Methods: The absorption spectra of the sound tooth and caries lesion were measured. A figure of merit was defined as the ratio of the two. The trend was verified by direct measurement of the onset threshold of laser power of the sound and decayed area.
Results: Optimal wavelength range for selective removal of caries from the sound tissue with turnable wavelength laser was estimated to be between 500～600 nm from the reflectance spectrum measurement of sound teeth and caries. Direct measured plasma onset power of laser beam corresponded to the same spectral range. In the sound tooth, about 20 J/cm2 irradiation power with 8 ns pulse of 532 nm laser beam was measured for plasma generation while that of caries lesion was about 12 J/cm2 as expected from the figure of merit by reflection spectrum measurement.
Conclusion: The optimal spectral range for laser ablation of dental caries is between 500 nm to 600 nm both from optical absorption and onset plasma generation power measurement. The figure of merit defined as the ratio of threshold power of laser ablation is bigger than 1.4 in this range.
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KEYWORD
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dental caries, optimal wavelength, selective laser ablation
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