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KMID : 0353319930170020339
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Oral Biology Research
1993 Volume.17 No. 2 p.339 ~ p.352
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The Effect of Nd:YAG Laser lrradiation on Exposure of the Dentinal Tubules on Root Surface in extracted human Teeth:A Scanning Electron Microscopic Study
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Cho Jong-Hee
Kim Byung-Ok
Han Kyung-Yoon
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Abstract
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The purpose of this study was to evaluate the effects of Nd:YAG laser treatment on removal of smear layer and exposure of dentinal tubules.
The experimental specimens were obtained from root planed surface of 30 human teeth which were extracted due to severe periodontal disease. The specimens were assigned randomly of three groups: root planed group, Tetracycline HCl(100mg/mℓ, 5min)
group,
and Nd:YAG laser (Laser-35TM, U.S.A. 5 seconds) group. Nd:YAG laser group was divided into 4 subgroups according to 3.0W, 4.0W, 4.5W of power. The surface change of specimens were evaluated by scanning electron microscopy. The number of exposed
dentinal
tubules and percentage of area occupied by dentinal tubule orifices per unit area between each group was statistically analyzed by paired Student 4-test.
@ES The results were as follows:
@EN 1. By root planing only, dentinal tubule was not exposed, but scale-like smear layer and parallel instrument tracks were resulted.
2. Tetracycline HCl treated surfaces exhibited the small number of partially exposed dentinal tubules with long orifices. The number(3.80±0.79) of exposed dentinal tubules on Tetracycline HCl group was significantly less than that in laser
groups
above 3.5W of power(P<0.001), and the percentage (0.68±0.19) of area occufied by dentinal tubule orifices per unit area(192μm*) was signficantly lower than that of any laser group(P<0.001).
3. The laser group irradiated with 4.5W of power showed both the most number(10.60±0.97) of exposed dentinal tubules among the experimental groups, and the highest percentage(3.75±0.55%) of area occupied by dentinal tubule orifices.
4. Energy Surge during laser pulsing and overlapping passes of the fiber resulted in melted and resolidified surface textures with lava-like appearance.
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