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전영찬 부산대학교 병원 암연구소 2007 부산대병원학술지 Vol.- No.21
Purpose: Modem trends of dental practise are the esthetic dentistry and impant dentistry. The aim of this study was to study the distribution of fixed restorations in PNUH patients, and to plan department management and clinical education. Subject and methods : Sixty patients, 41-60 years old, were examined during March from October 2006. Study model were fabricated and detail dental chart were recorded. Result and conclusion: Average numbers of fixed prosthodontic appliances were two. The most frequent restoration were gold restoration, and ceramo-metal restorations and base metal restorations followed. All ceramic restorations were rare. Implant restoration was not seen. In the distribution of abutment tooth , canine and 2nd premolar in upper arch, 2nd premolar and 2nd molar in the lower arch were the most frequent abutment.
전영찬 부산대학교 병원 암연구소 2008 부산대병원학술지 Vol.- No.23
Purpose: Modem trends of dental practise are the esthetic dentistry and implant dentistry, and basis of these two restorations are the technical accuracy and optimal case selection. The aim of this study was to evaluate the quality of cast alloy crown and to distinguish the possible causes. Subject and method: Sixty patients, 40~60 years old, were examined during from March to October 2006. Study model, intraoral examination record and X-ray taking were obtained. Result and conclusion: Major features of failed cast crowns were margin inaccuracy, secondary caries, and apical lesion. The relevance in combination area was higher than that in posterior and anterior area. Principles and instrumentation in tooth preparation should be re-educated intensively because the importances for biological and mechanical aspects in tooth preparation were ignored.
팔라듐-은 합금 도재소부전장 가공의치의 잔류응력과 변형에 관한 연구
전영찬,이호용,Jeon, Young-Chan,Lee, Ho-Yong 대한치과보철학회 1989 대한치과보철학회지 Vol.27 No.2
This study was taken to observe the changes of the residual stress in the alloy and to measure 3 dimensional distortions of the long span ceramo-metal bridge. The materials used in this study were Pors-on 4 (Pd-Ag alloy), and Ceramco and Vita VMK 68 powders. The residual stress of the alloy was measured on the six specimens (dia. 8m/m) by the X-ray diffraction stress analyzer according to the kind of ceramic powder and different measuring stages. And, for the measurement of the distortions, fifteen specimens of the anterior 8-unit ceramo-metal brige were fabricated and subjected to the 3-D coordinate measuring machine. Variables included the 2 kinds of a ceramic powder and the presence or absence of a splint bar at the cast metal framework. The measuring stages in both were after casting, after degassing and after glazing. The following conclusions were obtained : 1. The residual stress of the alloy showed increasing tendency for the tension by the ceramic fusing, but there was not significance. 2. The tendency of the distortions in the cast metal frameworks were decrease of the width, the anterior displacement and sagging. 3. The amount of the distortions at the degassing stage were greater than that at the ceramic fusing stage. 4. The splint bar was effective to control the distortion only at ceramic fusing stage. 5. The sagging distortion in the Ceramco firing were even through all measuring stages, but in the Vita firing, pronounced at degassing stage.
도재소부전장금관용 합금과 용액의 오염이 기포발생에 미치는 영향에 관한 실험적 연구
전영찬,이호용,Jeun, Young-Chan,Lee, Ho-Yong 대한치과보철학회 1982 대한치과보철학회지 Vol.20 No.1
This study was undertaken to observe the porcelain porosity exerted by the contamination of the alloy and liquid. The alloy used in this study was Jelstar; liquids were Ceramco Sta-Wet liquid, distilled water and tap water; and Ceramco vacuum porcelain powder was used. The measurements with photomicroscope (x200, Olympus) were made on the porosity, the diameter (mm) of the pores and the numbers of the pores ($No/mm^2$) The results of this study were obtained as follows: 1. In the porosity, the opaque layer contained over 70% of the total porosity, and the porosity was increased about twice in every porcelain layer by the tap water. 2. The contamination of the alloy and liquid caused porosity to increase markedly at the interface of the metal-porcelain. 3. The diameter of the pores were increased about 1.5 times larger by the contaimination of the liquid, and only a slight increase in the opaque layer due to the contamination of the alloy. 4. In the numbers of the pores, there were significant differences according to the contamination of the alloy and the porcelain layer. And the contamination of the liquid caused significant differences only in the opaque layer.