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CO₂레이저 조사가 치아경조직에 미치는 영향에 관한 EPMA분석 및 주사전자현미경적 연구
장계봉,이정석,이찬영,이승종 大韓齒科保存學會 1986 Restorative Dentistry & Endodontics Vol.12 No.1
The purpose of this study is to obtain the data of prestep in cavity preparation by observing changed conditions of laser irradiated dental hard tissues. The forty five extracted caries free human molars were divided into three groups and each group into five subgroups. A CO_2 laser irradiation was performed each subgroup of group I for one second with output power of 5 W, 10 W and 20 W. On group Ⅱ, laser irradiation was done ten times for 0.1 second, duration using same power ratings as group Ⅰ. On group Ⅲ, laser irradiation was done 0.1 second, 0.2 second and 0.4 second with output power of 50 W. We investigated mineral contents and crater wall of obtained specimens, i.e., laser irradiated teeth, using computer controlled electron probe microanalyzer and scanning electron microscope. The following results were obtained: 1. Both calcium and phosphorus contents in laser irradiated enamel crater wall were increased, and magnesium content was decreased, but these trends were not statistically significant. 2. In laser irradiated dentin, change of mineral content was more significant. 3. In laser irradiated enamel and dentin, there were no significant differences on mineral content change due to irradiation condition and energy density. 4. In scanning electron microscopic study, enamel rods of the crater wall were fused and clefts were observed in parallel with the direction of enamel rod for all groups. 5. In laser irradiated dentin, irregular fusion and clefts were observed, In irradiated teeth with high power and short duration, the locally formed narrow crater wall was observed.
CO<sub>2</sub>레이저 조사가 치아경조직에 미치는 영향에 관한 EPMA분석 및 주사전자현미경적 연구
장계봉,이정석,이찬영,이승종,Chang, Gye-Bong,Lee, Chung-Suck,Lee, Chan-Young,Lee, Seung-Jong 대한치과보존학회 1986 Restorative Dentistry & Endodontics Vol.12 No.1
The purpose of this study is to obtain the data of prestep in cavity preparation by observing changed conditions of laser irradiated dental hard tissues. The forty five extracted caries free human molars were divided into three groups and each group into five subgroups. A $CO_2$ laser irradiation was performed each subgroup of group I for one second with output power of 5 W, 10 Wand 20 W. On group II, laser irradiation was done ten times for 0.1 second duration using same power ratings as group I. On group III, laser irradiation was done 0.1 second, 0.2 second and 0.4 second with output power of 50 W. We investigated mineral contents and crater wall of obtained specimens, i.e., laser irradiated teeth, using computer controlled electron probe microanalyzer and scanning electron microscope. The following results were obtained: 1. Both calcium and phosphorus contents in laser irradiated enamel crater wall were increased, and magnesium content was decreased, but these trends were not statistically significant. 2. In laser irradiated dentin, change of mineral content was more significant. 3. In laser irradiated enamel and dentin, there were no significant differences on mineral content change due to irradiation condition and energy density. 4. In scanning electron microscopic study, enamel rods of the crater wall were fused and clefts were observed in parallel with the direction of enamel rod for all groups. 5. In laser irradiated dentin, irregular fusion and clefts were observed. In irradiated teeth with high power and short duration, the locally formed narrow crater wall was observed.
張啓鳳 大韓齒科保存學會 1980 Restorative Dentistry & Endodontics Vol.6 No.1
ABSTRACTThe corrosion of silver amalgam is regarded as one of major causes in the failures of' dental amalgam restorations. To evaluate the corrosion resistance of dental amalgam alloys, electrochemical tests such as potential and polarization measurement were used widely. But these commonly used methods have not provided the sufficient informations on relative resistance of amalgam to corrosion.In this experiment, the corrosion currents were measured using electronic potentiostat to compare some commercial dental amalgam alloys. All alloys were triturated in a amalgamator and condensed into a mold described in A.D.A.specifiction No.1 to produce cylinder form specimens of 4mm diameter by 5mm long. After specimen kept for 1 week at 37"C, each specimen was embedded in epoxy resin. The surfaces of specililens were then polished luith a emery paper, diamond dust, and Al203. These specimens were immersed in artifical saliva kept at 37"C, and currents of each specimen were measured for 24 hours at 0. 0volt (SCE).The author obtained conclusions as follows : 1. High copper amalgam showed superior resistance against corrosion to conventional amalgam, but a pellet form of high copper amalgam seemed to be susceptible to corrosion. 2. In lathe-cut alloys, fine·cut had superior resistance against corrosion to regular-cut. 3. Non-zinc conventional amalgam alloys were more resistant to corrosion than that of zinc containing conventional amalgam alloys. 4. In both of high copper and conventional amalgams, predispensed forms tended to have better resisitance to corrosion than that of pellet forms.
신봉석,김홍민,송영욱,이상미,김창원,정신홍,이문숙,이계성,이헌영 충남대학교 의과대학 의학연구소 2002 충남의대잡지 Vol.29 No.1
복부 방선균증은 흔한 질환은 아니지만 복부종괴가 있는 환자에서 수술 전에 방사선학적 검사와 세침 흡인술, 조직학적 검사 및 균 배양 등으로 악성 종양과 감별해야할 중요한 질환이다. 저자 등은 약 3개월간의 우하복부의 동통을 주소로 내원 하였던 40세 여자 환자에서, 복부 초음파와 대장 내시경, 바륨 대장 조영술과 복부 전산화 단층촬영에서 대장암을 의심하여, 개복 수술한 후 절제 생검에서 복부 방선균증으로 확진된 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Actinomycosis is a chronic suppurative and granulomatous disease caused by actinomyces species especially A. israelii. It is a relative infrequent disease and often difficult to diagnose because of no reliable clinical and radiologic findings. It is usually considered as a colon cancer, periappendiceal abscess, chronic appendicitis or intestinal tuberculosis. The diagnosis is usually made during exploratory laparotomy by staining of characteristic sulfur granules from surgically resected specimen and culture of actinomyces israelii. Treatment consists of long-term antibiotic therapy and surgical resection of infected lesion with antibiotic therapy. We report a case of abdominal actinomycosis, preoperatively impressed as a cecal cancer, which was diagnosed by histological study of the operative specimen.
황계호(Gye-Ho Hwang),강민(Min Kang),김건웅(Gon-Ung Kim),이창호(Chang-Ho Lee),임수민(Soo-Min Lim),김윤(Youn Kim),이봉섭(Bong-Seob Lee) 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
In this paper, for the security of the main entrance for the hearing-impaired and children, the user convenience, safety, and security that enables the visitor (request) doorbell signal and the door opening/closing control function remotely without temporal and spatial restrictions The applicability was confirmed by designing, manufacturing, and proposing a circuit configuration with added functions. In the future, children and visually/hearing-impaired people will also test whether the proposed device can be controlled remotely.
Poster Display : Pathogenicity of Korean Winter Dysentery (WD) Bovine Coronavirus to Calves
( Jae Ho Jeong ),( Gye Yeop Kim ),( Soon Seek Yoon ),( Su Jin Park ),( You Jung Kim ),( Chang Min Sung ),( Sung Shik Shin ),( Bong Ju Lee ),( Hong Bum Koh ),( Chai Yong Lee ),( Nam Yong Park ),( Mun I 한국수의병리학회 2004 학술대회 Vol.2 No.-