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根管處置時 根管面에 일어나는 微細構造의 變化에 關한 硏究
姜明會 大韓齒科保存學會 1980 Restorative Dentistry & Endodontics Vol.6 No.1
AbstractA Scanning Electron Microscope study was conducted to compare the effectiveness of mech - anical preparation of the root canal in conjunction with a few number of canal irrigants that have been widely used for canal treatment.The irrigants used in this study were 5% sodium hypochlorite, 3% hydrogen peroxide, .15% EDTA, and 30% hydrochloric acid.The root canals of 84 freshly extracted teeth with single or multi root were conventionally prepared with Hedstroem files. 78 canals were irrigated with normal saline solution following each instrument number and 6 canals were prepared without irrigation.After instrumentation 72 canals were flushed with various irrigants for predetermined length of time as shown on the Table 1.Additional 20 teeth were kept uninstrumented and five of theni were immersed in 15% EDTA for 5 minutes, five in 5% sodium hypochlorite for 5 minutes, five in 3% hydrogen peroxide for 20 minutes, and the last five were only rinsed with saline solution.The SEM examination revealed as follows: 1. The canal waU cannot be thoroughly prepared by means of files. 2. No typical structural changes occured on instrumented dentin surface by saline solution, 3% HzOa, 5% NaOCI, within 5 minutes. 3. 5% NaOCI Solution showed excellent solvent effect to organic substances in uninstrumented canal within 5 minutes and 15% EDTA and 3% H^Oz showed unsignificant changes. 4. 15% EDTA and 30% HC1 dissolved calcified debris and dentin chips that obturated thedentinal tubules and showed patent orifices. 5. 15% EDTA affected on peritubular dentin more readily and showed concavity around dentinal tubules.
김은경,강명회,김은미,홍완수 대한영양사협회 1997 대한영양사협회 학술지 Vol.3 No.1
The aim of this study was to evaluate the foodservice management practices in elementary schools in order to provide basic information for an efficient foodservice management. A self completed questionnaire survey of 912 schools in Korea was undertaken. Survey questionnaires consisted of 4 parts including general background, foodservice practices, purchasing practices and the status of cooking facilities and equipments. The main results of the empirical survey were as follows. 1. Elementary schools categorized by location were in urban areas (38.2%), provincial areas (48.0%) and in isolated areas (13.8%). 2. Conventional schools were 72.4% of the total followed by commissary management schools(23.5%) and commissary schools(4.1%). 3. The major factors considered for menu planning were nutritional adequacy(77.4%), preference of children(50.8%), food cost(46.0%), and cooking facilities & equipments in order. 4. The average cost of school lunch in provincial areas was 1494.8±224.9won followed by in isolated areas (1337.0±763.3won) and in large cities (1271.4±308.1won). The average food cost of lunch was approximately 950won with no significant difference by location of schools. 5.60% of food items excluding cereal were found to be purchased through vendors. 20% of cereals and its processed food were purchased through retailers in schools located in provincial and isolated areas, whereas 6.6% in schools located in urban areas. Food groups such as meat and its processed food, poultries, fish & shellfish, fruits and vegetables were more purchased through wholesalers in schools located in urban areas than in provincial and isolated areas. 6. Cereals including rice were regularily purchased once a month, whereas of other food items were found to be daily purchased in school located in urban and provincial areas.
근관충전 시 수분오염이 치근단 폐쇄성에 미치는 영향에 관한 연구
임성삼,강명회,Lim, Sung-Sam,Kang, Myung-Whai 대한치과보존학회 1996 Restorative Dentistry & Endodontics Vol.21 No.2
The purpose of this study was to investigate the effect of moisture on apical sealing properties of root canal. Fifty five single rooted human teeth were selected from maxillary and mandibular teeth. After removing crown portion at the cemento-enamel junction, all teeth were routinely prepared with step-back method. And then, the canals were dried with paper point and the teeth were randomly divided into 3 groups of 15 teeth each, and remaining 10 teeth were used as positive and negative control teeth : Group 1 were irrigated with 1ml of 95% alcohol and dried with air and paper point. Group 2 and 3 were intentionally contaminated with 0.05ml of 3.5% NaOCl or saliva, respectively. All the teeth were obturated with sealapex and gutta percha cone by lateral condensation technique, and covered with two coat of nail varnish after 48 hours of obturation. The teeth were immersed in india ink for 1 week and cleaned with methyl salicylate and then the degree of dye penetration were measured with stereomicroscope. The data were analyzed statistically by one-way ANOVA. The results were as follows : 1. All experimental groups showed varying degrees of dye penetration, and the mean degree of dye penetration was 0.1mm to 0.7mm. 2. Saliva contamination group(group 3) showed the highest amount of dye penetration, followed by NaOCl contamination group, then alcohol dried group, but there was no significant difference among three experimental groups. * This results suggest that there was no significant differences of apical leakage after canal obturation between alcohol dried canal and moisture present canals and the use of alcohol instead of paper point is unnecessary to dry the canals prior to canal filling. But other factors such as bacterial contamination and sealer discoloration by moisture must be considered in application of this results to clinical practice.
Kwon, JiYoon,Lim, SungSam,Baek, SeungHo,Bae, KwangShik,Kang, MyungHoe,Lee, WooCheol 대한치과보존학회 2007 Restorative Dentistry & Endodontics Vol.32 No.3
이 연구의 목적은 치주인대 섬유아세포에 MTA를 접촉시킨 뒤 성장인자 transforming growth factor-betal (TGF-β1), fibroblast growth factor-2 (FGF-2) 및 cytokine interleukin-6 (IL-6)의 발현량 변화를 측정하는 것이다. MTA군에서는 100 mg씩의 ProRoot MTA와 증류수를 혼합하고, IRM군은 동량의 IRM 분말을 용액에 혼합하여, 이 시료들을 경화반응이 진행되도록 7일간 놓아두었다. 사람의 치주인대 섬유아세포를 배양하여 MTA와 TRM 시료 상에 well당 1×10^(5)개 수준으로 도포한 뒤 6, 12, 24, 48시간 동안 배양하였다 (n = 5). 대조군으로는 재료의 접촉 없이 배양한 세포를 사용하였다. 시료에서 상c층액을 분리하여 TGF-β1, FCF-2, IL-6의 발현량을 enzyme-linked immunosorbent assay (ELISA)법으로 측정하였다. MTA군에서, 성장인자인 TGF-β1과 FGF-2는 대조군에 비해 유의성 있게 발현이 억제되었으며 (p<0.05), cytokine인 IL-6 발현량은 대조군과 유사한 수준으로 나타났다. Mineral trioxide aggregate (MTA) would influence healing of periapical tissues by modulating the production of growth factors and cytokines from PDL fibroblasts, however, the studies are insufficient. Therefore, the purpose of this study was to monitor the expression of transforming growth factor-betal (TGF-β1), fibroblast growth factor-2 (FGF-2), and interleukin-6 (IL-6) from PDL fibroblasts in the presence of MTA. The human PDL fibroblasts were seeded onto the set MTA or IRM at a level of 1×10^(5) cells per unit well, and further incubated for 6, 12, 24, and 48 hours. The levels of TGF-β1, FGF-2, and IL-6 from the supernatant were measured by enzyme-linked immunosorbent assay (ELISA). The data were analyzed using one-way ANOVA. The level of TGF-β1 was down-regulated when the cells were grown in the presence of MTA except at 6 hours. The levels of FGF-2 release were significantly suppressed when PDL fibroblasts were grown in the presence of MTA or IRM at all time intervals (p<0.05). The expressions of IL-6 from MTA treated cells were comparable to those of untreated control cells throughout the observation periods. We presume that this material inhibits the stimulatory function of growth factors on granulation tissue formation and in turn, it promotes the healing process modulated by other bone-remodeling cells. [J Kor Acad Cons Dent 32(3):191-197, 2007]