관전압 변화에 따른 방사선사진의 흑화도와 대조도

최갑식 慶北大學校 齒科大學 1990 慶北齒大論文集 Vol.7 No.2

The purpose of this study to evaluate the influence on radiographic density and contrast of 7-steps aluminum stepwedge according to kilovoltage changes(65-85 kVp range). And the influence on radiographic interpretation of experimentally produced bony lesions under kVp related radiographic densities is also examined. The following results were obtained. 1. The radiographic density of the aluminum stepwedge is increased with the increase of kVp, and increasing tendency of radiographic density is decreased with the increase of aluminum steps. 2. The range of radiographic contrast reveals 0.09-0.32 at 65-85 kVp range, and difference of radiographic contrast score is decreased with the increase of aluminum steps. 3. There is no influence on radiographic interpretation of experimentally produced bony lesions under the radiographic density range of 0.75-1.49.

하악에 발생된 결체조직성 섬유종

최갑식,박영희,최현주 大韓口腔顎顔面 放射線學會 1999 Imaging Science in Dentistry Vol.29 No.1

Desmoplastic fibroma is a rare, benign intraosseous fibroblastic tumor, which is locally aggressive. It is osseous counterpart of soft tissue fibromatosis. The authors experienced the patient who complained persistent mouth opening limitation with mild swelling on the left mandibular angle area. After careful analysis of clinical, radiological and histopathological findings, we diagnosed as desmoplastic fibroma of the mandible. The results were as follows: 1. Main clinical symptoms were mouth opening limitation which had been persistent for 9 months and mild swelling on the left mandibular angle area. 2. Radiographs showed the radiolucent lesion and expansion of lingual cortex. CT finding is homogeneous soft tissue mass with expansion of left mandibular ramus. Destruction of medial wall of ramus and invasion to adjacent soft tissue is also seen. 3. Histopathologically, plump spindle shaped fibroblasts arranged in bundles or fascicles are observed. The cells of tumor are infiltrating into muscle fiber with destruction of bony trabeculae and merged with surrounding salivary gland.(J Korean Oral Maxillofac Radiol 1999:29:355-363)

치아형태 이상에 관한 방사선학적 연구

최갑식 大韓口腔顎顔面 放射線學會 1994 Imaging Science in Dentistry Vol.24 No.1

The purpose of this study was to evaluate the prevalence and distribution according to the types of tooth shape anomalies in permanent teeth of 6,082 persons by means of analysis of the full mouth periapical radiographs. And the following results were obtained; 1. Among tooth shape anomalies, the highest incidence was observed on dilaceration (20.14%), followed by dens invaginatus(3.02%), peg lateralis(1.48%), taurodontism(0.34%), dens evaginatus(0.33%), talon cusp(0.20%), fusion(0.07%) and gemination(0%) in descending order of frequency. 2. Peg lateralis, dens invaginatus and dilaceration occurred more prevalent in females, and other types of tooth shape anomalies occurred more prevalent in males. 3. Dens evaginatus and taurodontism occurred with bilateral tendency, but other anomalies occured with unilateral tendency. 4. As to the involved teeth, maxillary lateral incisors were the most frequently involved teeth on peg leateralis, dens invaginatus and talon cusp. And the mandibular premolars were the most frequently involved teeth on dens evaginatus, the maxillary first molars were on taurodontism, the maxillary second premolars were on dilaceration, and the mandibular incisors and canines were on fusion.

파노라마방사선사진상의 이공에 관한 연구

최갑식,배용철,김동윤,손정익 경북대학교 의학연구소 1999 경북대학교병원의학연구소논문집 Vol.3 No.1

The purpose of this study was to evaluate the position and shape of mental foramen in panoramic radiographs. For this study, panoramic radiographs were obtained from the 200 adults and evaluated the position and shape of mental foramen. According to various positional changes in panoramic radiographs of the patients, the author also obtained panoramic radiographs from the 100 adults and then evaluated the positional and shape changes of mental foramen. The following results were obtained: 1. Shapes of metal foramen were observed elliptical(43.3%), round or oval(42.5%), unidentified(7.5%) and diffuse (6.7%) type in descending order of frequency. 2. Horizontal position of mental foramen were most frequently observed at the 2nd premolar area(54.2%), and area between the 1st premolar and 2nd primolar(43.1%), area between the 2nd premolar and 1st molar(2.7%) in descending order of frequency. 3. Vertical position of mental foramen were most frequently observed at the inferior of apex(88.2%), and at apex (9.7%), overlap with apex(1.9%), superior of apex(0.2%) in descending order of frequency. 4. According to various positional changes in panoramic radiographs of the patients, shape changes of mental foramen were more obviously observed at the forward 10mm and chin down 10。 positioned panoramic radiographs. And changes of horizontal and vertical position were observed in similar to compared with normal positioned panoramic radiographs.

섬유성이형성증과 골화섬유종의 방사선학적 감별진단

최갑식 慶北大學校 齒科大學 1993 慶北齒大論文集 Vol.10 No.1

저자는 섬유성 골병소 중 임상 방사선학적 및 조직병리학적으로 확진된 골 형성기이후의 섬유성이형성증 49증례와 골화섬유종 14증례의 방사선학적 소견을 비교하여 다음의 결과를 얻었다. 1. 섬유성이형성증은 10대에서, 골화섬유종은 20대와 30대에서 호발되었으나, 두 질환 모두 여성에서 다소 호발되었다. 2. 초진시의 주소는 대부분 약골의 무통성 팽창이었으며, 섬유성이형성증은 상악(61.1%)에서 다소 많았으나 골화섬유종은 하악(92.9%)에서 대부분 발생되었으며, 병소의 대부분은 구치부에서 관찰되었다. 3. 병소의 크기는 섬유성이형성증에서 다소크게 나타났으며, 하악에서 병소의 형태는 섬유성이형성증에서는 방추형이었으나 골화섬유종은 구형 또는 타원형이었다. 4. 섬유성이형성증의 병소는 방사선불투과상(63%)이 다소 많았으나, 골화섬유종은 대부분 방사선투과상과 방사선불투과상의 혼합상(92.9%)으로 나타났으며, 병소 내부의 방사선불투과상의 형태는 섬유성이형성증에서 비교적 균일하게 나타났으나, 골화섬유종에서는 중심부에서부터 주변부로 확장되는 양상이었다. 5. 섬유성이형성증의 모든 병소에서 주변 정상골과의 경계를 구분할 수 없었으나, 골화섬유종의 병소에서는 비교적 명료한 경계가 관찰되었다. 6. 피질골의 팽융과 비박이 대부분의 병소에서 관찰되었으나 섬유성이형성증에 비해 골화섬유종의 병소에서 피질골의 팽융정도가 심했다. 7. 치조백선의 소실, 치아의 편위, 하악관의 전위는 두 질환 모두에서 관찰되었으나, 치근흡수는 섬유성이형성증의 병소에서는 관찰되지 않았고 골화섬유종의 병소에서만 관찰되었다. The author observed and compared the radiographic features of 49 cases of the fibrous dysplasia and 14 cases of the ossifying fibroma in the osteoblastic or mature stage radiologically and histopathologically. The obtained results were as follows: 1. Fibrous dysplasia occurred most frequently in the 2nd decade, but ossifying fibroma in the 3rd and 4th decades, and both lesions occurred with slight prediection in females. 2. In most cases, chief complaints were painless facial swelling. And 61.1% of fibrous dysplasia occurred in the maxilla, 92.9% of ossifying fibroma in the mandible, and most of these lesions occurred in the premolar-molar region. 3. In the mandibular lesions, ossifying fibroma was shown more oval and round shape, but fibrous dysplasia was shown fusiform shape. 4. Fibrous dysplasia was shown homogeneously distributed, complete radiopaque shadow at 63%, and ossifying fibroma was shown concentric, mixed appearance of radiolucent and radiopaque shadow at 92.9%. 5. Fibrous dysplasia was entirely shown poorly outlined and blended to normal surrounding bone, but ossifying fibroma was shown well-defined border. 6. Cortical thinning and expansion were observed in these lesions, but degree of cortical expansion was more severe in ossifying fibroma than fibrous dysplasia. 7. Loss of lamina dura, tooth displacement, and displacement of mandibular canal were observed in both lesions, but root resorption was observed in ossifying fibroma only.

하악에 발생된 법랑모 섬유육종

최갑식,이은숙,박태원,최미 大韓口腔顎顔面 放射線學會 1993 Imaging Science in Dentistry Vol.23 No.2

The ameloblastic fibrosarcoma is the malignant counterpart of the ameloblastic fibrosarcoma in which the mesenchymal element has become malignant. Clinically it frequently occurs in the 3rd and 4th decades, and more frequent in the mandible than in the maxilla. Radiographic features are apparent multiocular radiolucency with ill-defined border. The authors experienced two cases of ameloblastic fibrosarcoma of the mandible in a 26-year-old male and a 48-year-old female patients who suffered from pain and swelling on the affected area. And we discussed the clinical, radiological and histopathological features of this disease with a brief review of the literatures.

파노라마 X선사진상의 무명선에 관한 연구Ⅱ

최갑식,이강숙 大韓口腔顎顔面 放射線學會 1995 Imaging Science in Dentistry Vol.25 No.1

The purpose of this study was to investigate the changes of the shape of the panoramic innominate line and alsoto examine the relation of the panoramic innominate line to maxillary posterior wall according to positional changes in panoramic radiographs of the patients who had no pathoses in the maxillary sinus and adjacent bony structures. Thus these panoramic radiographs were obtained and evaluated in standard, forward 10mm, backward 10mm, chin down 10°,and chin up 10°positions. And the following results were obtained: 1.Panoramic innominate lines were not changed in shape according to various positional changes in panoramic radiography. 2.The panoramic innominate line was observed to be more clear images and decreased distance to the posterior wall of maxillary sinus at forward 10mm and chin down 10°positions. And the panoramic innominate line was observed more blurred images and increased distance to the posterior wall of maxillary sinus at backward 10mm and chin up 10°positions.

파노라마 X선사진상의 무명선에 관한 연구 Ⅰ

최갑식,이강숙 大韓口腔顎顔面 放射線學會 1994 Imaging Science in Dentistry Vol.24 No.2

The purpose of this study was to investigate the incidence of the types of the panoramic innominate lines in panoramic radiographs of the patients who had no pathoses in the maxillary sinus and adjacent bony structures. And all panoramic radiographs were obtained in standard position. And the following results were observed: Panoramic innominate lines were observed various types of vertical lines running across the outer third of the maxillary sinus in all examined panoramic radiographs. And types of them were similar in the right and left side of each patient. The types of the panoramic innominate lines were observed most frequently as concave type(69.3%), followed by convex type(12.5%), flat type(9.0%), uneven type(8.3%), and obliterated type(1.3%) in descending order of frequency. According to the age and sex, convex type was also observed most frequently in all examined radiographs.

방사선조사가 악하선 미세혈관과 내피세포에 미치는 영향에 관한 실험적 연구

최갑식,최미,손정익,유영아,배용철 大韓口腔顎顔面 放射線學會 1994 Imaging Science in Dentistry Vol.24 No.1

The purpose of this study was to investigate the irradiation effects on the capillary and endothelial cell in the submandibular gland. Sprague-Dawley strain male rats were singly irradiated to their neck region with the dose of 5Gy and 10Gy by 6MV X-irradiation and sacrificed on the 6 hours, 12 hours, 1,3,7, and 14 days after irradiation. The authors observed the histological changes of the capillary at H & E and PAS staining under a light microscope, and also observed the ultrastructural changes of the endothelial cell using a transmission electron microscope. The obtaining results were as follows: 1. In the light microscopic examination, the capillary density was slightly increased on the 1 day after irradiation, and increased until the 7 days after irradiation. After then, capillary density was apparently decreased. 2. The reaction to PAS staining at acinar cells was decreased on the 6 hours after irradiation, and recovered on the 7 days after irradiation. But reaction was decreased on the 14 days after irradiation again, after then, gradually recovered with days. 3. In the transmission electron microscopic examination, mild proliferation of cytoplasmic process of the endothelial cell and reduction in luminal size were observed just after irradiation. After then, nuclear degeneration, marked proliferation of cytoplasmic process, thickened basal lamina, and numerous cytoplasmic vesicles were observed on the 1 day after irradiation. These changes were recovered to normal on the 14 days after 5GY group, but not with 10GY irradiation group. And destruction of endothelial cell and loss of basal lamina were not observed in both groups. 4. From the above results, reduction in luminal size, proliferation of cytoplasmic process and thickening of basal lamina were observed as the irradiation effects on the capillary and endothelial cell of the submandibular gland. And also, these changes may induce increase in capillary number and endothelial permeability by means of increase of cytoplasmic vesicle formation. The changes appeared earlier and more prominent in 10Gy irradiated group than in 5Gy irradiated group.

다발성 골수종

최갑식,하춘호,손정익 大韓口腔顎顔面 放射線學會 1994 Imaging Science in Dentistry Vol.24 No.1

Multiple myeloma is a malignant plasma cell tumor that is thought to originate proliferation of a single clone of abnormal plasma cell resulting production of a whole monoclonal paraprotein. The authors experienced a case of multiple myeloma with severe mandibular osteolytic lesions in 46-year-old female. As a result of careful analysis of clinical, radiological, histopathological features, and laboratory findings, we diagnosed it as multiple myeloma, and the following results were obtained ; 1. Main clinical symptoms were intermittent dull pain on the mandibular body ares, abnormal sensation of lip and pain due to the fracture on the right clavicle. 2. Laboratory findings revealed M-spike, reversed serum albumin-globulin ratio, markedly elevated ESR and hypercalcemia. 3. Radiographically, multiple osteolytic punched-out radiolucencies were evident on the skull, zygoma, jaw bones, ribs, clavicle and upper extremities. Enlarged liver and increased uptakes on the lesional sites in RN scan were also observed. 4. Histopathologically, markedly hypercellular marrow with sheets of plasmoblasts and megakaryocytes were also observed.