威尔科克森符号秩检验
牙科
医学
材料科学
数学
口腔正畸科
曼惠特尼U检验
内科学
作者
Shaza M. Hammad,Mai El Banna,Inas El Zayat,Mohamed Abdel Mohsen
出处
期刊:PubMed
日期:2012-02-01
卷期号:25 (1): 3-8
被引量:51
摘要
To evaluate the effect of application of a resin infiltration material on masking the white spot lesions (WSLs) after bracket removal.18 patients participated in this study and were divided into two groups of nine patients each; by a visual score based on the extent of demineralization, according to the classification of the WSLs. Group 1: Visible WSLs without surface disruption and Group 2: WSLs showed a roughened surface but not requiring restoration. Three successive photographs were taken for every patient; immediately after bracket removal, 1 week after oral hygiene measures and after Icon material application. The JPEG images were imported into image analysis software (Image J version 1.33u for Windows XP, US National Institutes of Health) which presented the images into histograms of gray scale from (0 to 255). Initial and final images were compared for percentage of WSLs masking area.For both groups, a statistically significant difference at P<0.05 was obtained as follows; for WSLs in Group 1, the means at gray scale for the initial and the final photographs were 126.091 +/- 13.452 and 221.268 +/- 9.350 respectively and they revealed significance by Wilcoxon's signed rank test = 0.038, P<0.05. For WSLs in Group 2, the means at gray scale for the initial and the final photographs were 95.585 +/- 20.973 and 155.612 +/- 31.203 respectively and they revealed significance by Wilcoxon's signed rank test = 0.029, P<0.05.
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