CAD/CAM 으로 제작된 Ceramic Inlay의 변연누출에 관한 비교연구

조병훈,이명종,임미경,이광원,손호현 大韓齒科保存學會 1997 Restorative Dentistry & Endodontics Vol.22 No.2

To compare the marginal leakage of CAD/CAM-fabricated ceramic inlay, gold inlay and amalgam, forty extracted caries-free premolars were prepared with Class Ⅱ MO cavity design. The teeth were divided into four groups of ten samples each. Group 1 was restored with CAD/CAM-fabricated ceramic inlays cemented with Scotchbond Resin Cement / Scotchbond Multi-purpose plus. Group 2 was restored with gold inlays cemented with Scotchbond Resin Cement / Scotchbond Multi-purpose plus. Group 3 was restored with gold inlays cemented with zinc phosphate cement. And, Group 4 was restored with amalgam. All samples were thermocycled, and stored in 1% methylene blue. Marginal leakage was examined at four margins, that is, occlusal distal, priximal gingival, occlsal facial and occlusal lingual margins from sectioned samples under steeomicroscope(x15). The results were as follows: 1. Group 1 and 2 showed no statistically significant difference among marginal leakage at all four examined margins(p>0.05). 2. Group 3 and 4 showed significant marginal leakage at proximal gingival margin compared with other margins(p<0.05). 3. Significantly increased marginal leakage at priximal gingival, occlusal facial and occlusal lingual margins in group 3 were observed compared with other groups(p<0.05).

심장수술 2,450예와 심장이식

조광현,황윤호,이양행,류지윤 인제대학교 1999 仁濟醫學 Vol.20 No.1

MRI용 초전도 능동차폐 마그네트의 설계에 관한 연구

조윤현,이광호,김성도 東亞大學校 附設 情報通信硏究所 1996 情報通信硏究所論文誌 Vol.4 No.1

An optimal design approach is presented for the high homegeneity superconducting magnet with a superconducting active shield esperically for a magnetic resonance imaging system. This paper is investigated magnetic phenomena for a stray magnetic to get reduction technigues of the unwanted stray magnetic field from the superconducting magnet.

호스피스 시설의 유형별 공간구성에 관한 건축 계획적 연구

조광현,박재승 한국의료복지시설학회 2002 의료·복지 건축 Vol.8 No.1

Recently cancer, AIDS, chronic sickness have increased according to the elevation of socioeconomic level and fast change of lifestyle. The number of patients receiving terminal care increased fairly because the span of life is extended by development of medicinal technology. Also necessity of hospice and palliative care was risen according to the request of terminal patients that remove pain and keep calm life by interest about quality of life, However architectural plan and type specialization of facility which can correspond team's composition and supplied nursing program are not consisting. This study researches about care environment of hospice facility plan through investigation into terminal patient's special quality. The purpose of this study is to propose fundamental datas of hospice facility for architectural plan through comparative analysis of cases of domestic and outside facilities.

심장수술 2,450예와 심장이식

조광현,황윤호,이양행,류지윤 인제대학교 1999 仁濟醫學 Vol.20 No.1S

인제대학교 부산백병원에서는 1985년 10원 개심술이 처음 시행된 이후 1998년 말까지 2,450예의 개심및 비개심 심장수술이 이루어졌는데 이중 개심술이 2,290예, 비개심술은 160예 였다. 개심술 중 선천성이 1,697예(74.1%), 후천성이 573예(25.9%)였으며, 선천성 중에는 비청색증군이 1,548예(91.2%), 청색증군이 149예(8.8%)이었다. 후천성 중에는 심장판막질환이 471예(79.6%)로 가장 많았고, 관상동맥우회수술이 73예(12.1%), 대동맥류수술이 28예(4.7%), 심장종양절제술이 15예(2.5%) 및 심장이식수술이 2예, 기타 4예 등이었다. 특히 1993년부터 심장이식술을 위한 기초 및 동물실험 을 계속하다가 1997년 9월 말기심부전증환자에게 심장이식이 성공적으로 이루어져 개심술의 새로운 장을 열게 되었다. 술후 조기 사망은 선천성 비청색증군에서 30예(1.9%), 청색증군에서는 27예(16.7%), 후천성질환군에서는 26예(4.4%)였고, 전체 수술성공률은 96.5% 로 비교적 좋은 성적을 거두었다. From Sep. 1985 to Dec. 1998, 2,450 cases of heart operation including 2 cases of orthotopic heart transplantaion were performed in the Department of Cardiothoracic Surgery, Inje Universty, Pusan Paik Hospital The results of retrospective clinical review of them were obtained as follows. 1.Open heart surgery cases and non-open heart surgery cases were 2.290 and 160, respectively. Among the open heart cases, congenital cases and acquired cases were 1,697(74.1%) and 593 (25.9%), respectively. 2.Among the congenital cases, acyanotic cases and cyanotic cases were 1,548(91.2%) and 149(8.8%), respectively. The postoperative hospital mortality was 1.9% (30 cases) in the acynotic group and 16.6% (25 cases) in the cyanotic group. 3.Among the acquired cases, valvular heart disease, coronary artery disease, aortic aneurysm, cardiac tumor, heart transplantation and others were 471 (79.6%), 73(12.1%), 28(4.7%), 15(2.5%), 2(0.3%) and 4(0.7%) cases, respectively. 4.Prosthetic valve replacement (457 case, 97.0%) and valve reconstructive surgery(14 cases, 3.0%) were performed for the valvular diseases. Postoperative hospital mortality of valve surgery and coronary artery bypass surgery was 2.8% (13 cases) and 28.6% (6 cases), respectively. 5.28 cases of aortic aneurysm (ascending or arch aneurysm) were operated under cardiopulmonary bypass. The causes of aneurysm were annuloaortic ectasia(9), dissecting aortic aneurysm(16), and non-dissecting chronic aneurysm(8). The early postoperative hospital mortality was 8 cases(28.6%). 6.Two cases of heart transplantation were performed successfully using Shumway method .The total ischemic time of donor heart was 80 minutes and 50 minutes respectively. 7.Minimally invasive surgery (using lower sternal incision) was performed successfully in the cases of mitral and tricuspid valve diseases(10) and congenital septal defects (20). In conclusion, the over all postoperative hospital mortality was not so high as 3.5 %, whereas more proper management for congenital cyanotic group was seemed to be necessary.

Trirutile type 고체촉매를 이용한 olefin의 에폭시화 반응에 관한 연구

조영범,안광현 慶熙大學校 材料科學技術硏究所 2000 材料科學技術硏究論集 Vol.13 No.-

과산화수소를 이용한 알켄의 산화 반응에서 trirutile type 고체 산화물이 효과적으로 촉매 역할하는 것을 관찰할 수 있었다. 특별히 HNbMoO_(6), LiNbMoO_(6) 및 HNbWO_(6)등이 좋은 촉매효과를 보여주었다.

Fallot 四徵症의 根治手術

曺洸鉉 인제대학교 1985 仁濟醫學 Vol.6 No.1

One of the most common of the more serious congenital malformations of the heart is the tetralogy of Fallet, which is said as the watershed between the simple and complex cardiac anomalies. And, therefore, all cardiac surgeons have been much interested in surgical approach of this anomaly. Although Stensen deserves credit for the first description in 1972 of what is new termed the tetralogy of Fallot, nevertheless it is Etienne-Louis Arthur Fallot (1888) of Marseille, France, whose name is characteristically attached to this congenital cardiac disorder. In the original description of this, Fallot stated, "This malformation consists of a true anatomopathological type represented by the following tetralogy: (1) stenosis of the pulmonary artery; (2) interventricular communication; (3) deviation of the origin of the aorta to the right; (4) hypertrophy, almost always concentric, of the right ventricle. Failure of obliteration of the foramen ovale mar ocassionally be added in a wholly accessory manner." Despite the fact that accurate clinical diagnosis could often be established after these contributions by fallot, nevertheless, many years passed before definitive treatment of this was initiated by Blalock and Taussig (1945) with the establishment of the subclavian artery to pulmonary artery anastomosis. Thereafter, several types of this kind of palliative operation were established by Potts (1946), Waterston (1962), Sellors (1948), Brock (1948) and Glenn (1954). In an imaginative and daring effort, in 1954, Lillehei using controlled crass-circulation, carried out the first intracardiac repair of this anomaly by closing the VSD and relieving the pulmonary stenosis under direct vision. The results of surgery for this have steadily improved over the years, thanks to important contributions of many surgeons. Nevertheless because of its protean physiologic and anatomic presentations, tetralogy of Fallot continues to offer challenges to cardiologists and cardiac surgeons. Auther wanted to study and summarize about the radical operation of this anomaly with literature review.

대기 현상에 대한 초등학생의 선개념 및 오개념 분석

조현희,김광명 춘천교육대학교 과학교육연구소 2001 과학교육연구 Vol.24 No.-

Nd:YAG 레이저 조사와 불화물 도포가 탈회법랑질의 재광화에 미치는 영향

조현,이광희,김대업 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.3

Normal pulsed Nd:YAG 레이저 조사와 불소화합물이 산성음료수에 의해 탈회된 법랑질의 표면 미세경도에 미치는 재광화 효과를 평가하고자 한다. 법랑질 시편을 제작하여 50ml 플라스틱 시험관 5개에 코카콜라를 채운 후 30개의 소구치를 6개씩 나누어 넣고 탈회시켰다. 법랑질 표면에 6W 출혁하의 50mJ 에너지 밀도, 20Hz의 pulse rate로 레이저를 조사하였다. 레이저가 조사된 법랑질 표면에 각 군별로 여러 형태의 불소화합물을 처리한 후 탈회 전, 후의 미세경도 및 Diagnodent를 측정하였다. 동일한 방법으로 탈회된 법랑질에 레이저를 조사했을 때와 레이저가 조사된 법랑질 표면에 불소화합물을 처치한 후에 미세 경도 및 Diagnodent를 측정하였다. 법랑질 표면을 산성 음료에 탈회 후, 레이저 조사 후, 불소화합물 처치 후의 각각의 시편에 대하여, 주사전자현미경으로 1500배 확대하여 관찰하였다. 1. 산성 탈회된 법랑질 표면의 미세경도(VHN)가 레이저를 조사한 수와 불소 도포 후에 증가하였으나, 레이저 조사 후의 경도와 불소 도포 후의 경도간의 차이는 유의하지 않았다. 2. 초기 경도, 탈회 후 경도, 레이저 조사 후 경도, 불소 도포 후 경도에서 불소군 간의 차이는 모두 유의하지 않았고, 불소 용액 군과 불소 젤 군에서는 레이저 조사 후의 경도와 불소 도포 후의 경도 간에 유의한 차이가 없었으나, 불소 바니쉬군에서는 유의한 차이가 있었다. 3. Diagnodent 측정치의 변화에서 초기 점수, 탈회 후 점수, 레이저 조사 후의 점수와 불소 도포 후의 점수 간에는 유의한 차이가 있었고, 레이저 조사 후 점수와 불소 도포 후의 점수가 불소 도포 군 사이에서는 유의한 차이가 없었다. 4. 산성 음료수에 탈회된 법랑질 표면에의 Nd:YAG 레이저 조사는 재광화에 효과적이며, 불소화합물의 처치는 레이저의 효과를 증가시키는 부가적인 효과를 갖는다. 5. 주사 전자 현미경상에서 Nd:YAG 레이저가 조사된 법랑질 표면은 전체 표면이 법랑소주가 녹아내려 융합된 매끈한 바닥에 균열이 생기고 분화구가 퍼져 있는 양상을 보였으며, 불소 도포 후에는 균열과 분화구 형태는 뚜렷하지 않으며 탈회된 후의 표면에 가까운 양상을 보였다. The purpose of this in vitro study was to investigate the effects of Nd:YAG laser irradiation and fluorides on acid demineralized enamel. The materials were 30 freshly extracted permanent premolars with intact smooth enamel surfaces. They were demineralized with Coca-cola at 37℃ for 12 hours and then irradiated by Nd:YAG laser with 6W power, 50mJ/㎠ energy density, and 20Hz pulse repetition. After laser irradiation, teeth were treated by three kinds of fluorides; (1) 0.05% NaF fluoride solution (2) 1.23% APF gel and (3) 0.1%F fluoride varnish, microhardness(VHN) and Diagnodent scores were measured and the surfaces of each treated specimens were also observed with SEM under 1500 magnification. The results were as follows: 1. In the change of microhardness(VHN), it decreased to 34.68% from the initial micrhardness, increased to 78.37% after laser irradiation and increased to 82.62% after fluoride treatment, there were significant differences except when it was irradiated and treated with fluoride(P<0.05). 2. In the change of Diagnodent scores, it was decreased to 28.08% from the initial scores after demineralization, and then increased to 59.81% after laser irradiation, and increased to 82.17% after fluoride treatment. Scores were different significantly between the scores of initial, demineralization, laser irradiation and fluoride treatment (P<0.05). All the scores were not different significantly between fluoride types. 3. SEM observation showed that the lased enamel surfaces after demineralization were thermally degenerated and showed molten lava-like appearance and crater with cracks and many microholes.

유사체액에서의 전기화학적 처리가 티타늄 표면의 인산갈슘 흡착에 미치는 영향

조국현,김문영,송광엽,배태성,이민호 大韓齒科器材學會 2002 대한치과재료학회지 Vol.29 No.3

This study was performed to examine the effect of electrochemical treatment on the precipitation of apatite-like calcium phosphate in a simulated body fluid. Titanium plates of 20×20×1 ㎣ in dimensions were polished sequentially from #600 to #2,000 emery paper and one surface of each specimen was received an additional polishing sequence through 0.1㎛ alumina paste. To improve the bioactivity of titanium plates, they were electrochemically treated at 100 mA for 20 min in an electrolyte containing the calcium and phosphate ions, and the Hanks' solution with pH 7.4 at 36.5℃ for 30 days, and the surfaces were examined with X-ray diffractometer(XRD), scanning electron microscope(SEM) and X-ray photoemission spectroscopy(XPS). Precipitation of calcium phosphate and CaO were observed on the electrochemically treated titanium surface in a simulated body fluid after treatment at 600℃. Precipitation of calcium phosphate was densified and coarsened with increasing the temperature of the electrolyte solution in the range of 20-80℃. The calcium phosphate contained phosphate in the form of Po₄^3-, HPO₄^2-, and H₂PO₄^-.