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문기찬(Kee Chan Moon),김수남(Soo Nam Kim),김종일(Jong Il Kim),김창규(Chang Kew Kim) 대한피부과학회 1987 대한피부과학회지 Vol.25 No.5
This study was undertaken to investigate some mechanical properties of the skin with special relatio to pH. The abdomenal skin of guinea pig was prepared and cut into appropriate skin strips(1.5mm*15mm). The pieces of skin strips were then suvject to measurement (stretching and vreaking load) using a rheometer after treatment in various pH vuffers and humectant solutions (lactic acid, PCA, citric acid). The result are summarized as follows ; 1. Treatment of the skin in the extreme acidic (pH3) solution showed significant deformity (swelling and shrinkage in length). 2. The overall measurements after treatment in the humectant solutions were not significantly different from those in standard vuffer solutions. 3. The stretching was maxiaml at pH7 and minimal in the extreme ranges of pH(pH 3 and pH11). 4. The measurement of vreaking load showed minimal value at acidic pH3 and revealed linear increments as pH increased.
혼합치열기 아동에서 산성 고자당 액상배지를 사용한 우식활성검사성적과 우식경험도의 상관성에 대한 연구
장문수,이흥수,김수남 원광대학교 치의학연구소 1993 圓光齒醫學 Vol.3 No.1
The purpose of this study was to evaluate the validity of new caries activity test which used pH 5.4, 30% sucrose liquid medium. The caries experience and caries activity of 220 second grade elementary school children were examined. Caries experience was measured by dt, ft, dft, DT, FT, DFT, dDT, fFT and dDfFT indexes. Caries activity was measured by the pH drop of the pH 5.4, 30% surcrose liquid medium which was inoculated by dental plaque and incubated for 4 days. Dental plaque was sampled from the subject's upper buccal toothsurfaces by a cotton applicator and the latter was directly put into the test tube containing the medium. Every 24 hours pH was read by observing the color change of pH indicator bromcresol green in the medium with the color standard. 3 or 4 days' pHs were converted to scores and then added together. There was significant correlatation between caries experience and caries activity test score. Pearson' s correlation coefficient between dDfFT index and the sum of caries activity test scores for 96 hours was 0.4186(P=0.0000). High caries activity group(pH<5.0) had 2-3 or 1.5-2-fold more dDfFTs than low caries activity group (pH≥5.0). Therefore, the new caries activity test which uses pH 5.4, 30% sucrose liquid medium may be used to differentiate the high caries activity group which need intensive caries prevention from the low caries activity group as a valid and practical caries activity test.