정모두부방사선사진 촬영시 두부의 수직회전에 따른 투사오차

고은희,이기헌,황현식 대한치과교정학회 2003 대한치과교정학회지 Vol.33 No.2

본 연구는 정모두부방사선사진 촬영시 수직적 두부회전이 방사선사진상의 계측치들에 어느 정도의 투사오차를 야기시키는지 알아보고자 시행되었다. 임상검사를 통하여 두드러진 전후방 골격이상이나 뚜렷한 안면비대칭을 보이지 않는 성인 25명을 대상으로 natural head position 상태를 기준위치(0˚)로 정하고 이 위치에 대해 양쪽 ear rod를 연결한 수평축을 중심으로 두부를 상하방으로 5˚, 10˚씩 회전시킨 상태에서 정모두부방사선사진을 각각 촬영하여 투사도를 작성한 다음 7개의 고경항목, 5개의 폭경항목, 6개의 각도항목을 계측하였다. 각 회전각도에서의 계측치를 비교분석하여 다음과 같은 결과를 얻었다. 1. 고경계측항목의 투사오차가 폭경이나 각도계측항목에 비해 전반적으로 큰 양상을 나타냈다. 2. 고경계측항목 중 회전축으로부터 먼 계측점간의 거리를 나타내는 항목일수록 투사오차가 컸다. 3. 폭경계측항목 중 비강폭경, 상악폭경, 상악 제1대구치간 폭경은 각 회전각도 간에 통계적 유의차가 없었으나 하악폭경과 하악 제1대구치간 폭경은 통계적으로 유의차가 있었다. 4. 각도계측항목 중 menton의 편위정도를 나타내는 각도는 각 회전각도 간에 통계적 유의차가 없었으나 crista galli와 maxillare를 연결한 선이나 crista galli와 antegonion을 연결한 선과 수평기준선이 이루는 각도는 통계적으로 유의차가 있었다. 이상의 결과는 수직적 두부회전에 의해 정모두부방사선사진상에 투사오차가 발생하므로 유용한 정모두부방사선사진을 얻기 위해서는 촬영시마다 동일한 두부위치를 유지하기 위한 노력이 필요함을 시사하였다. This study was performed to find how much projection errors in the cephalometric measurements were made by vertical head rotation in taking posteroanterior cephalograms. 25 adults without any apparent facial asymmetry or severe sagittal skeletal discrepancy were selected and the posteroanterior cephalograms were taken with the head rotated 5˚, 10˚superior and inferior each to the reference position(0˚). The 7 height, 5 width and 6 angular measurements were taken at each 5 positions. Through the statistical analysis of all measurements taken at each rotated position, following results were obtained. 1. The projection errors of height measurements were remarkably larger than those of width or measure ments. 2. Among the height measurements the farther to the rotation axis the measurements were the larger the projection errors were. 3. Among the width measurements, mandibular width and intermolar width of mandibular first molars showed significant differences between the values taken at each rotated position, while nasal width, maxillary width and intermolar width of maxillary first molars did not. 4. Among the angular measurements, the angle between horizontal reference line and line that is connected to crista galli and antegonion or maxillare showed significant differences between the values taken at each rotated position. The above results suggest that it is needed to the effort to keep constant head position for taking the useful posteroanterior cephalogram, because projection errors are caused by vertical head rotation.

교정용 와이어 및 브라켓에 이산화티탄 광촉매 코팅 시 코팅방법에 따른 비교연구

고은희,조진형 대한치과교정학회 2006 대한치과교정학회지 Vol.36 No.6

본 연구는 항균 교정장치의 개발에 도움이 되고자 이산화티탄 광촉매의 코팅 시 안정적이고 효과적인 방법을 찾기 위하여 시행되었다. 시판되고 있는 교정용 와이어와 브라켓에 sol-gel법, CVD (Chemical Vapor Deposition)법 및 PE-CVD (Plasma Enhanced-CVD)법으로 이산화티탄을 각각 코팅한 다음 각 방법으로 코팅된 이산화티탄 박막의 특성을 알아보고자 주사전자현미경을 이용하여 각 시편의 코팅박막 표면의 거칠기를 관찰하였고 adhesive tape pull test를 이용하여 코팅박막의 접착강도를 측정하였다. 메틸렌블루용액에 각 시편을 침지시킨 후 시간경과에 따른 메틸렌블루용액의 농도변화 측정을 통해 코팅박막의 분해능을 평가하였으며 불화나트륨 용액에 각 시편을 침지시킨 후 주사전자현미경을 이용하여 표면부식 정도를 관찰함으로써 불소화합물에 대한 내부식성을 평가하여 다음과 같은 결과를 얻었다. 코팅박막의 표면은 CVD법 및 PE-CVD법이 sol-gel법이나 코팅되지 않은 시편에 비해 더 매끄러웠다. 코팅박막의 접착강도는 PE-CVD법이 가장 높았고, CVD법, sol-gel법의 순으로 낮게 나타났다. 코팅박막의 메틸렌블루 분해능은 PE-CVD법이 가장 높았고, CVD법, sol-gel법의 순으로 낮게 나타났다. 코팅박막의 불소화합물에 대한 내부식성은 CVD법 및 PE-CVD법이 sol-gel법에 비해 높게 나타났다. 이상의 결과는 교정용 와이어 및 브라켓의 이산화티탄 광촉매 코팅 시 CVD법 및 PE-CVD법이 sol-gel법보다 적절한 방법임을 시사하였다. The purpose of this study was to search for an appropriate method of coating TiO_(2) on orthodontic appliances. TiO_(2) thin films were deposited on orthodontic wires and brackets using sol-gel, CVD(Chemical Vapor Deposition) and PE-CVD (Plasma Enhanced-CVD) methods. The roughness of TiO_(2)-coated surfaces was investigated via scanning electron microscope (SEM) and adhesive strength of TiO_(2) thin films was measured by adhesive tape pull test. Methylene blue degradation test was carried out to evaluate the photocatalytic activity of TiO_(2) and the corrosion resistance of TiO_(2) thin films against fluoride solution was also analyzed by observing the surfaces of TiO_(2)-coated wires and brackets via SEM after immersion in sodium fluoride solution. Through the comparison of properties and photocatalytic activity of TiO_(2) thin films according to the coating methods, the following results were obtained. Smoother surfaces of TiO_(2) thin films were generated by CVD or PE-CVD methods than through the sol-gel method or the control. Adhesive strength of the TiO_(2) thin films was highest in PE-CVD and gradually became lower in the order of CVD, then the sol-gel method. Photocatalytic activity of TiO_(2) thin films on methylene blue was the highest in PE-CVD and gradually became lower in the order of CVD, then the sol-gel method. Corrosion resistance of TiO_(2) thin films against fluoride solution was stronger in CVD and PE-CVD methods than in the sol-gel method. The results of this study suggest that the CVD or PE-CVD methods is more appropriate than the sol-gel method for TiO_(2)coating on orthodontic wires and brackets.

폐흡충증 1예

고은석,권계원,김희경 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Pulmonary paragonimiasis is one of the most important endemic parasite disease in Korea despite decreased prevalence recently which clinically manifest cough, hemoptysis and chest pain, and radiologically necessitate differential diagnosis with tuberculosis or lung cancer. We experienced a case of pulmonary paragonimiasis in a 64-year-old female with cough and intermittent hemoptysis. A thoracic computed tomography (CT) scan revealed variable sized nodules with central necrosis suggesting chronic organizing pneumonia with abscess formation of fungus granuloma. Histopathologically, necrotizing granulomatous inflammation and egg granulomas were prominent and the surrounding lung parenchyma showed chronic organizing pneumonia.

기관의 용골부위에서 발생한 염증근섬유모세포종 1예

고은석,권계원,김희경 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Inflammatory myofibroblastic tumor is an uncommon, benign tumor of various organ and tissue which is vary rare in the carina of the trachea. We report a 36-year-old male patient with inflammatory myofibroblastic tumor arising in the carina of the trachea. Histologically, the tumor was composed of mainly myofibroblastic cells a few lymphoplasma cells.

단일 림프절내에서 발생한 여포림프종에서 버킷 림프종으로 악성 세포전환 : 1예 보고

김희경,김숙,곽정자,고은석 순천향의학연구소 2008 Journal of Soonchunhyang Medical Science Vol.14 No.1

Follicular lymphoma (FL) is the most common indolent or low-grade non-Hodgkin's lymphoma. Histologic transformation of high-grade lymphoma, generally to diffuse large B-cell lymphoma, occurs in 25-35% of cases. Although t(14;18), the cytogenetic hallmark of FL, has been found in ~85% of these cases, multiple secondary cytogenetic and molecular genetic changes underlie the transformation process We describe a case of follicular lymphoma with histologic documentation of transformation to Burkitt lymphoma within a single lymph node.

난소의 이행상피암종 : 1예 보고 A case report

김희경,권계원,고은석 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Transitional cell carcinoma of the ovary is a recently recognized subtype of ovarian surface epithelial-stromal carcinoma, and studies of its morphology are few. We report a case of primary transitional cell carcinoma of the ovary in a 30-year-old woman. Histologically, the tumor was composed of a papillary pattern or solid nested pattern similar to TCC of the bladder and thick bands of atypical cells. The tumor cells appeared relative monomorphic and evenly spaced at low magnification. Their nuclei were oblong or round, and has large, eosinophilic nucleoli, and the cytoplasm was pale and granular and usually moderately abundant. The degree of cellular atypia was moderate to marked. The tumor had neither benign nor borderline Brenner elements. Immunohistochemically, the tumor cells were immunoreactive for cytokeratin 7, EMA, CA-125 but not reactive for cytokeratin 20.

폐에서 발생한 광범위 상피모양육아종을 동반한 MALT형의 변연부 B 세포 림프종 : 1예 보고 A case report

김희경,권계원,고은석 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Epithelioid granulomas have been reported in association with a wide range of neoplasm including malignant lymphoma. In lymphoma, this refers mainly to Hodgkin's lymphoma and T-cell derived non-Hodgkin's lymphomas where a granulomatous reaction is probably evoked by aberrant cytokine production in the tumor cells or other cells composing the tumor background. Here we report a case of primary pulmonary extranodal marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue(MALT) with concomitant extensive epithelioid granulomas. Histologically, the tumor cells were admixed with numerous epithelioid cells that formed clusters and granulomatous lesions. No microorganisms could be detected at the tissue level, and there were no clinical of laboratory indications of an underlying immunodeficiency. The tumor cells were composed of centrocyte-like cells, plasmacytoid lymphocytes, and plasma cells that formed lymphoepithelial lesions and exhibited a lymphangitic growth pattern.

흉막에 발생한 악성 섬유조직구종 : 1예 보고

김희경,김숙,곽정자,고은석 순천향의학연구소 2008 Journal of Soonchunhyang Medical Science Vol.14 No.1

Malignant fibrous histiocytoma (MFH) is a uncommon primary sarcoma, occurring exceptionally in the thoracic site. We report a case of MFH of the pleura. A 46-year-old male was admitted with chest pain one month ago. A chest computed tomographic scan disclosed left pleural thickening with mlutifocal protruding mass-like lesions and diffuse calcification. Also left pleural space revealed loculated fluid collection. The left lung shows passive atelectasis. But right lung parenchyma demonstrate neither abnormal nodules nor ground-glass opacity. Histological examination of the needle biopsy showed bundles of spindle cells in a stohform pattern. The tumor have greater degree of nuclear atypia and mitotic activity. Immunohistochemically, tumor cells were positive for vimentin, alpha 1-antichymotrypsin, and CD99 and focally positive for S-100 protein. The tumor cells did not express cytokeratin, TTF-1, calretinin, CD34, epithelial membrane antigen, bcl-2, ALK protein, c-kit, actin, and desmin.

난소에 발생한 원발성 소세포암종 : 2예 보고 Two cases reports

권계원,고은석,김희경 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Primary small cell carcinoma of the ovary is a rare, aggressive tumor of young women and has two subtypes. The pulmonary type small cell carcinomas of the ovary that resembled small cell carcinoma of the lung and differed from both clinically and pathologically from small cell carcinoma of the ovary, usually associated with hypercalcemia. The histogenesis of the primary ovarian small cell carcinoma has not been established. We have identified two cases of small cell carcinomas primary in the ovary. One has microscopic features of pulmonary type, and the other has hypercalcemic type. Pulmonary type small cell carcinoma patient was a 40-year-old woman. She was admitted due to known ovarian mass. She was well before this episode. Total abdominal hysterectomy and bilateral salpingo-oophorectomy was performed. Gross examination revealed 15cm sized right ovarian mass which was mostly solid with multifocal necrosis. Histologically, the tumor was composed of small to medium sized round cells with scanty cytoplasm, hyperchromatic nuclei, inconspicuous nucleoli, numerous mitotic figures forming large sheets and diffuse pattern. Hypercalcemic type small cell carcinoma patient was a 43-year-old woman. She was also complained of right abdominal swelling and discomfort of 1 month duration. She was received total abdominal hysterectomy due to myoma in 3 years ago. The serum calcium levels was elevated. Right salpingo-oophorectomy and omentectomy was performed. Gross examination revealed 15cm sized huge ovarian mass which was mainly solid with small cystic components and hemorrhagic necrosis. The omentum showed several oval shaped metastatic nodules. Microscopic examination reveals closely packed tumor cells with scanty cytoplasm, vesicular nuclei that contains single nucleoli, and numerous mitotic figures. Many folliculoid spaces are present. Pulmonary type small cell carcinoma patient died 13 months after surgery. Hypercalcemic type small cell carcinoma patient was alive without evidence of disease 2 months after surgery but lost to follow up thereafter.

성인 자원자에서 B방식 초음파를 이용해 측정한 경동맥 내막중막두께의 분포

이선규,황희영,김형식,장미선,이은주,강문호,고광곤 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.11