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KMID : 0358919920190020521
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Journal of the Korean Academy of Pedodontics
1992 Volume.19 No. 2 p.521 ~ p.536
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An experimental study on the effect of Nd:Yag laser to the enamel surface in vitro
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Abstract
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The purpose of this study was to investigate the changes of polished and caries enamel of third molar when they were irradiated by the CW Nd:YAG laser with opticla fiber delivery system and the pulsed Nd:YAG laser. The author investigated the
hardness
of lased enamel surfaces with the energy density of 40 J/㎠ and the shear bond strength between etched enamel and composite resin, and examined the polished and caries enamel surfaces irradiated by CW Nd:YAG laser with the energy density of
20-120
J/㎠
by using scanning electron microscope.
@ES The obtained results were summerized as follows:
@EN 1. The Knoop hardness decreased significantly after irradiating the Nd : YAG laser with the energy density of 40 J/㎠ (P<0.01).
2. The shear bond strength of enamel showed a significant difference before and after irradiating the Nd : YAG laser with the energy density of 40 J/㎠ (P>0.05).
3. SEM photographs showed the irregular microcracks and the structural changes of lased enamel surface.
4. SEM photographs showed the aspect of decrease in decalcification of enamel prism after irradiated with the energy density of 40 J/㎠.
5. SEM photographs showed the aspect of removal in caries enamel when they were irradiated with the energy density of 70 J/㎠.
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KEYWORD
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