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齒科用 Amalgam合金의 粉末形態 및 組成分析에 대한 實驗的 硏究
선우양국 대한치과기재학회 1981 대한치과재료학회지 Vol.8 No.1
The author studied on the shape and composition of five different dental amalgam alloys. The secondary electron images of the specimen were observed under the Scanning Electron Microscope and the composition of specimen was analyzed by an Electron Probe Microanalyzer (JSM-35). The results were as follows; 1. Shape: The shape of the specimen S-1 was less even than the specimen S-2 and S-3. There were seen some uneven forms, such as a kind of peanut shell and rugby ball in the picture (SEI, S-1) of the spherical alloy, S-1. Both of the lathe-cut specimen L-4 and L-5, however, did not show any difference in their size and of the alloys. 2. Composition: The sequence from high to low degree of each content of the respective metal, Ag, Sn, Cu, and Zn is as follows. Ag.....................................................S-1, S-3, L-5. S-2, L-4 Sn......................................................S-3, S-1, L-5, S-2, L-4 Cu......................................................S-3, L-5, S-1, L-4, S-2 Zn......................................................S-3, L-5, S-1, L-4, S-2(no) The main components of silver and tin were evenly seen in all of the 5 specimen. Zinc was shown in all of the specimen except non-zinc alloy S-2, but was almost negligible in the alloy L-4. It should be natural that the 10% high copper alloy S-3 be shown most abundant in the content of the copper. The copper content in the specimen S-1 was seen a little locally concentrated, especially in the lathe-cut specimen L-4 more conspicuously.
선우양국 대한치과기재학회 1980 대한치과재료학회지 Vol.7 No.1
The author studied the strength of a dental amalgam alloy which was developed in Korea recently by the name of K-amalgam alloy. It was a conventional lathe cut one in shape. The mercury to alloy ratio was 1 to 1. The results were as follows; 1. In the strengths of the specimen, 15 minute tensile strength showed 140 psi and the 1 hour compressive strength was 3.650 psi which was far below the level of the A.D.A. specification No.1. 2. In the final strengths of the specimen, however, the 24 hour tensile strength showed as high level as 6.00×103 psi and the 24 hour compressive strength was 48.56×103 psi with 0.2mm of the cross head speed per minute. These strength values were a little superior to those of the Caulk micro cut alloy and the high copper content amalgam alloy. 3. In order to level up the early strength values of the alloy, an improved technical manufacturing process seemed to be necessary such as heat treatment.
齒科用 Amalgam 合金의 微細構造 : The Microstructure of Dental Amalgam
金哲偉,鮮于良國 大韓齒科器材學會 1966 대한치과재료학회지 Vol.1 No.2
It was the purpose of this study to determine the influence of mercury-alloy ratio, the methods of trituration and variation of trituration time on the microstructure of dental amalgam. The results were as follows. 1. Variations of the mercury content in the amalgam have a definite influence on the micrestructure; the higher the mercury content, the more porosities and cracks were developed. 2. A photomicrograph of the surface of a hardened amalgam with the alloy-mercury ratio, 1.0:1.6 showed fewer alloy particles and more the matrix than in the amalgam with the alloy-mercury ratio, 1.5:1.0 by weight. 3. The method and the length of trituration time did not have any appreciabie effect on the microtructure of the amalgam.
치과용 Composite resins의 간접인장 강도에 관한 연구
선우양국,김철위,임호남 대한치과기재학회 1982 대한치과재료학회지 Vol.9·10 No.1
The purpose of this study was to evaluate the diametral tensile strengths of commercially available dental composite resins used in Korea. For this study, the specimens were transferred to an environment of 23℃±2℃,50%±10% humidity and at a water of 37℃±1℃. Diametral tensile test specimens were prepared in 6×12mm stainless steel cylindrical molds and tested at 1/2 hour, 1 hour, and 24 hours. The results obtained in this study were as follows; 1. It can be seen that, a significant difference of diametral tensile strength values for composite resins was observed with various time intervals and commercial products. 2. It was found that the diametral tensile strength of composite resins tested in water at 37℃± 1℃ has a tendency to higher the strength than in air at room temperature.