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4종의 도재 수리 시스템용 콤포짓 레진의 전단결합 강도 비교
강백면,계기성,고영무 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.4
Fractures in metal-ceramic restorations can be occurred and need to be repaired. The purpose of this study was to investigate the shear bond strength of four kinds of ceramic repair systems (Superbond C&B, Choice, Clearfil and Ivoclar) applied to the porcelain surface and the metal combined porcelain surface with visible light cured composite resin. Twenty samples were prepared for each bonding system(ten for porcelain surface and ten for metal combined porcelain surface). All samples were etched with 8.9% hydrofluoric acid for 60 seconds. The specimens were made according to the manufacturer's instruction. After the thermocycling for 2,000 cycles between 5℃ and 55℃ with 30 seconds dwell time, the specimens were tested for calculating shear bond strength using universal testing machine with a 3㎜/min crosshead speed. In porcelain surface groups, the shear bond strength of Ivoclar ceramic repair system was significantly lower than those of other systems(p<0.05). In metal combined porcelain surface groups, the shear bond strength of Ivoclar ceramic repair system was significantly lower than those of other systems(p<0.05), and the shear bond strength of Choice system was significantly lower than those of Clearfil repair system and Superbond C&B system(p<0.05).
고영무,최한철,강성남,강희영,이승윤 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.3
A gallium based alloy(GA) that was developed as a substitute for dental amalgam was investigated for electrochemical corrosion behavior in 4 kinds of electrolytes(1% lactic acid, 0.05% HCI, Modified Fusayama's artificial saliva, and 0.9% NaCl). The related corroded microstructure were examined and microanalyses were conducted using ICPES. Polarization tests were conducted by scanning from -1,500㎷ to 1,000㎷(vs.SCE) at 75㎷/min. The obtained results were as follows: 1. GA showed wide passivation area next to SYB in artificial saliva, suggesting good stability. 2. The amounts of Sn, Cu released from GA were similiar to those of CAV, and decreased in the order of KAT, SYB. 3. All of specimens were observed pits at the area of pores in electrolytes containing chloride ions, and forming much corrosion products in 1% lactic acid and artificial saliva after corrosion test. 4. From the surface analyses of XRD, GA showed much corosion products containing gallium at the surface after corrosion test. In conclusion, the corrosion resistance of GA was lower than that of SYB and similiar to that of CAV and KAT.
계기성,강동완,김광수,고영무,김윤주 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.1
The purpose of this study is to evaluate the use value of tooth ash-plaster mixture as an alternative material of the synthetic hydroxyapatite. For this purpose the author performed the experimental study to investigate the physical properties of sintered tooth ash-plaster mixture. The tooth ash was made by increasing procedure at 850℃, 900℃ and 950℃ for 20min, 40min and 60min respectively. The composition of tooth ash was analyzed using ICPSE and X-ray diffraction was done. The experimental specimens were molded to the cylindrical from 10mm high, 5mm diameter under the pressure of 1,000kg/㎠ for test of compressive strength values and 3mm high, 6mm diameter for test of diametral tensile strength values and surface microhardness values. Mixtures of tooth ash-plaster mixture was vacuum fired at 1,000℃ for 60min. The physical properties of the sintered specimen were examined and their microstructures were observed under the scanning electron microscope. The results were as follows: 1. x-ray diffraction showed the crystallization of tooth ash was developed as the incinerating temperature and time were increased, but the phase transformation following the incinerating temperature and time was not occurred. 2. The values of compressive strength of the sintered tooth ash-plaster mixture were the highest in case of incinerating temperature 950℃, the incinerating time 60min, and the tooth ash-plaster mixing weight ratio of 4:1. The higher tge incineration temperature and the longer the incineration time was, the more increased the compressive strengths were(p<0.01). 3. The values of diametral tensile strength of the sintered tooth ash-plaster mixture were the highest in case of the incinerating temperature 950℃, the incinerating time 60min, and the tooth ash-plaster mixing weight ratio of 4:1. The higher incineration temperature and the longer the incineration time was, the more increased the diametral tensile strengths were (p<0.01). The more decreased tooth ash-plaster mixing ratio was, the more increased the diametral tensile strength was, but there was not a significant difference statistically (p<0.01). 4. The values of surface microhardness of the sintered tooth ash-plaster mixture were also the highest in case of the incinerating temperature 950℃, the incinerating time 60min, and the tooth ash-plaster mixing weight ratio of 4:1. The higher the incineration temperature was, the more increased the surface microhardness values were, but there was not a significant difference statistically(p<0.01). The longer the incineration time was and the more decreased the tooth ash-plaster mixing ratio was, the more increased the surface microhardness values were. 5. The porosity and absorption of the sintered tooth ash-plaster mixture were the highest in case of the incinerating temperature 850℃, the incinerating time 20min, and the tooth ash-plaster mixing weight ratio of 3:1. The lower the incineration temperature was and the shorter the incineration time was, the more increased the porosity was. 6. There was a good wettability in the sintered tooth ash-plaster mixture under the scanning electron microscope.
KISTI-ACOMS를 기반으로 한 대한치과보존학회 온라인논문투고관리시스템 개발
박재원,강무영 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.6
Societies are important sources of new information for users. However. most of these societies still rely on traditional. or rather ancient methods for gathering and servicing the information. Furthermore. most of the societies are trying to electrify processes such as managing members and paper submission as well as the process managing the information for service but are limited due to financial and technical reasons. Therefore. KISTI(Korea Institute of Science and Technology Information) has developed the 『KISTI ACOMS(KISTI Article COntribution Management System)』 as part of the national project for automating the process of processing academic information by societies. in order to convert journals published by academic societies in Korea into an electronic form and make them accessible on the Internet. This system has been developed in the year 2001 and has since been distributed to societies free of charge. The number of societies requesting the service has risen recently. which prompted us to take more recommendations of the societies that adopt this system into account in expanding and standardizing the area of service being provided by the system.
강무영(Mu-Yeong Kang),이민호(Min-Ho Lee),주원균(Won-Kyun Joo) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅰ
본 논문에서는 여러 가지 분산통합 검색 방법중 학습을 이용한 분산통합 검색 시스템을 설계한다. 분산통합 검색시스템의 여러가지 이슈중 결과통합 문제에 주안점을 두었으며, 설계목적은 다양한 학습방법을 적용한 검색 결과 통합 실험을 위함이다. 이러한 목적을 달성하기 위하여 확장성을 고려한 모듈화를 통한 설계를 적용하여 다양한 실험과 향후 컬렉션 선택모듈, 질의변환 모듈도 삽입이 가능하도록 설계하였다.