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류현옥,김기옥,김성교 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.5
The purpose of this study was to investigate the influence of light irradiation over self-priming adhesive on dentin bonding. After acid etching the exposed dentin, a self-priming adhesive (Prime&Bond□NT dental adhesive system, Dentsply DeTrey, GmbH, Konstanz, Germany) was applied and light irradiation was done for 20 sec with regular intensity (600 mW/㎠) in group I and for 3 sec with ultra-high intensity (1930 mW/㎠) in group III. No light irradiation was done over self-priming adhesive in groups II and IV. Composite resin was added on the self-priming adhesive and irradiated for 40 sec with regular intensity (600 mW/㎠) in groups I and II and for 3 sec with ultra-high intensity (1930 mW/㎠) in groups III and IV. To see the effect of light curing time on dentin bonding, another 3 group specimens were prepared. Without light-irradiation over self-priming adhesive, added composite resin was irradiated for 3, 6, or 12 sec with ultra-high intensity light. After bonded specimens were stored in 37℃ distilled water for 24 hours, shear bond strength were measured using a universal testing machine (4202, Instron, Instron Co., U.S.A.) and fractured surfaces were examined under a stereomicroscope (SZ-PT Olympus, Japan) . Statistical analysis were done with one-way, two-way ANOVA and chi-square test. The results were as follows: 1.The shear bond strengths from the groups irradiated over self-priming adhesive were significantly higher than those from the groups without irradiation (p<0.05). 2.There was no significant shear bond strength difference between regular intensity light irradiation groups and ultra-high intensity ones (p>0.05). 3. There was no significant shear bond strength difference among various irradiation time groups with ultra-high intensity ones (p>0.05). 4.In stereomicroscopic examination of fractured surfaces, adhesive-cohesive mixed failure mode was mostly seen in all groups, and there was no significant difference in failure mode among groups (p>0.05) . Key words : Light irradiation, Self-priming adhesive, Dentin bonding, Shear bond strength
金美香,徐香順,劉賢玉,李承愛,鄭守然,趙桂賢 효성여자대학교 가정대학 학도호국단 1983 家政大論集 Vol.2 No.-
공장폐수가 유입하는 금호강 하류의 하천부지에서 재배된 깻잎을 채취하여 일반영양성분 및 중금속 함량 등을 분석한 결과는 다음과 같다. 1. 깻잎속에는 수분 86.5%, 단백질 3.0%, 지질 0.6%, 당질 6.0%, 섬유질 2.6%, 회분 1.8%이고 Ca이 77mg%, P이 195mg%, Fe이 35mg%였다. 2. Cd함량은 0.05~0.46ppm로 평균 0.17ppm이였으며 Pb은 평균 0.66ppm이였다. This experiment was carried out to investigate the pollution state of heavy metal in vegetables. Perilla leave are used as the materials grown in the lower kyumho river into which polluted water from factories. The results were summarized as follow: Perilla leave contained 86.5% of water, 3% of protein, 0.6% of lipid, 6.0% of carbohydrate, 2.6% of fiber and 1.8% of ash. Minerals are composed of Ca 77mg%, P 195mg%, Fe 35mg%. The content of Cd was 0.05~0.46ppm, it's average was 0.17 ppm. The content of Pb was 0.23~0.90ppm, it's average was 0.66ppm.