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Streptococcus faecalis의 細胞凝集抗原과 그 Plasmid에 關한 硏究
崔忠國,金顯旭 서울大學校 農科大學 1986 서울대농학연구지 Vol.11 No.1
Several strains of Steptococcus faecalis have been studied for the cell agglutination and their plasmids, including antibiotics resistance. The results obtained were summarized as follows. 1. Cell aggregation took place in four pairs of culture mixtures including S. faecalis DS-5 and the aggregation response was strongest between S. faecalis DS-5 and S. faecalis ATCC 29200. 2. S. faecalis DS-5 and S. faecalis ATCC 29200 were more resistant to several kinds of antibiotics than other strains tested. Antibiotes resistance of S. faecalis DS-5 was not cured by acridine orange treatment. 3. S. faecalis ATCC 19953 happened to have no plasmid and other strains of S. faecalis had one to four plasmids.
Vita Lumin Shade Guide와 Vita Shade Resin Composite 간의 색깔차이
고영무,최한철,최충국 대한치과기재학회 1996 대한치과재료학회지 Vol.23 No.2
The Purpose of this study was to evaluate the possibility of using Vita Lumin shade guide to select shades of composite resin. Vita Lumin shade guide, such as four kinds of composite resin; Z100(3M), Prisma T.P.H.(Caulk/Dentsply), Tetric(Vivadent), Dentacolor resin system(Kulzer Co.) and shade guide which is supplied by the manufacturer were used in this study. The four kinds of shade which are poplar were used; A2,A3,B3, and D3, but, in case of Prisma T.P.H. we chose A3.5 instead of A3 because it does not have A3 shade. The shade guide from the manufacturer and Vita Lumin shade guide are ready made but we made 6 samples od each composite resin which size are 10±1mm in diameter, 2.0±0.1mm in thickness, and then composite resin were light cured for 40 sec. In case of the Dentacolor resin system, we put them into the Dentacolor XS unit then light cured 180 sec. according to manufacturer's instruction. After the curing, we eliminated the samples from the molds and stored them in distilled water for 48 hours. Using the Colorimeter(Hunter Inc, USA) and examining the value of L*a*b* for three times, we calculated their mean values. The resulte were as follows; among all 4 kinds of composite resin which are produced by same shade, shade guide which are supplied by same shade vs. composite resin, there are big differences more than expected. In the view of the result of this study, there is a little problem with the use of the Vita Lumin shade guide and the shade guide which is supplied by munufacturer. Therefore, we conclude that we need more accurate the cuatomized shade guide. This study was supported by research funds from Chosun university.
감소된 치조골 고경을 갖는 치아와 골유착성 임프랜트에 의해 지지되는 고정성 국소의치의 유한요소법적 응력분석
최충국,계기성,조규종,Choi Choong-Kug,Kay Kee-Sung,Cho Kyu-Zong 대한치과보철학회 1994 대한치과보철학회지 Vol.32 No.2
The purpose of this study was to evaluate the mechanical effects when one implant fixture was connected to the natural teeth with reduced alveolar bone height. This study also examined the effects of increasing the number of abutment teeth and the effects of the intramobile connector and the titanium connector as they were inserted between the implant superstructure and the fixture. The distribution and concentration load was applied to the fixed partial denture(FPD) supported by implant and the natural teeth with reduced alveolar bone height. The stress and displacement of each element was observed and compared by the two-dimensional finite element method. The following results were obtained : 1. The greater the loss of alveolar bone in natural teeth area, the greater the displacement of FPD and the stress concentration in alveolar bone around implant, especially at the stress concentration in the mesial alveolar bone crest around implant fixture. 2. The displacement of FPD was increased more and that of implants fixture was decreased more when intramobile connector was used than titanium connector was used. Also the stress concentration in alveolar bone around implant fixture was greater when intramobile connector than titanium connector. One implication of this finding was that the difference in stiffness of implant and the natural teeth with reduced alveolar bone height could be partially compensated in case of the POM intramobile connector. 3. The amount and direction of displacement and the stress distribution of the 4-unit FPD was better than those of the 3-unit FPD. It implied that the difference of stiffness of implant and natural teeth with reduced alveolar bone height could be partially compensated in case of the 4 unit FPD.