Research Article
In Vitro Effects of Two Topical Varnish Materials and Er:YAG Laser Irradiation on Enamel Demineralization around Orthodontic Brackets
Table 1
Multiple comparisons of microhardness values of specimens from 3 positions and 5 depths from the coronal side of bracket surface.
| Distances from bracket surface | Depths | Er:YAG laser group | Control group | TCP group | ACP group | | Mean | SD | Mean | SD | Mean | SD | Mean | SD |
| 0 μm | 10 μm |
331.31 | 25.64 | 323.81 | 31.48 | 362.83 | 37.95 | 351.42 | 24.60 | 0.009* | 20 μm | 335.90 | 26.42 | 323.91 | 20.89 | 378.53 | 23.12 | 355.36 | 20.47 | 0.000* | 40 μm | 322.92 | 25.55 | 312.21 | 22.59 | 373.44 | 12.85 | 355.17 | 24.90 | 0.000* | 70 μm | 306.69 | 22.51 | 291.20 | 26.20 | 356.37 | 16.32 | 330.87 | 25.43 | 0.000* | 90 μm | 283.63 | 21.76 | 286.20 | 15.96 | 345.10 | 19.68 | 321.30 | 23.83 | 0.000* |
| 100 μm | 10 μm | 358.05 | 14.52 | 350.14 | 17.76 | 393.68 | 11.28 | 364.23 | 6.15 | 0.000* | 20 μm | 359.67 | 14.78 | 348.88 | 29.11 | 392.84 | 10.88 | 370.85 | 7.64 | 0.000* | 40 μm | 347.35 | 16.69 | 338.79 | 23.86 | 380.27 | 10.51 | 358.81 | 22.92 | 0.000* | 70 μm | 327.77 | 17.69 | 313.54 | 31.97 | 367.99 | 11.41 | 329.78 | 25.81 | 0.000* | 90 μm | 311.72 | 23.71 | 302.04 | 31.74 | 352.48 | 12.13 | 318.90 | 24.99 | 0.000* |
| 200 μm | 10 μm | 361.07 | 10.87 | 331.81 | 30.32 | 392.05 | 10.54 | 356.75 | 15.67 | 0.000* | 20 μm | 356.66 | 13.52 | 338.37 | 16.48 | 385.45 | 13.96 | 353.79 | 18.20 | 0.000* | 40 μm | 668.70 | 1042.84 | 320.36 | 30.06 | 367.85 | 12.02 | 348.08 | 18.67 | 0.002* | 70 μm | 315.02 | 20.18 | 294.23 | 30.15 | 357.53 | 11.86 | 334.81 | 18.65 | 0.000* | 90 μm | 289.22 | 34.87 | 276.30 | 28.59 | 344.01 | 13.13 | 318.49 | 24.44 | 0.000* |
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*: significance level; SD: standard deviation.
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