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디지털 방사선 촬영술을 이용한 치근 흡수 판독에 관한 실험적 연구
오필교,김재덕,Oh Phill-Gyo,Kim Jae-Duk 대한영상치의학회 1995 Imaging Science in Dentistry Vol.25 No.2
The purpose of this study was to quantitatively evaluated experimental tooth root resorption for digital radiography. For this study, experimentally three root sites were used, and radiograms were taken with standardized apparatus. Digital imaging system were consisted of NEC PC-980l(computer), TRINITRON(monitor), SONY XC-711 CCD camera. The display monitor had a resolution of 512X512 pixels. The obtained results were as follows: 1. In the difference of the four X-ray film of the contrast correction, the contrast difference was one gray scale variation at mean value. 2. Viewing of the view box of the periapical radiographs, experimental tooth root resorption of the periapical area of the first premolar, middle of mesial surface of the first molar mesial root, middle of lingual surface of the first molar distal root were recognized by increased diameter. 3. On the analysis by histogram, the periapical area of the first premolar, the middle of mesial surface of the first molar mesial root were each recognized tooth root resorption of the 5,6,7 pixel, 2,4,5 pixel by increased diameter. 4. On the analysis by histogram, the middle of lingual surface of the first molar distal root was each recognized tooth root resorption of the none, 3,6 pixel by increased diameter.
디지탈 방사선 촬영술을 이용한 치근 흡수 판독에 관한 실험적 연구
오필교,김재덕 大韓口腔顎顔面 放射線學會 1995 Imaging Science in Dentistry Vol.25 No.2
The purpose of this study was to quantitatively evaluated experimental tooth root resorption for digital radiography. For this study, experimentally three root sites were used, and radiograms were taken with standardized apparatus. Digital imaging system were considered of NEC PC-9801(computer), TRINITRON(monitor), SONY XC-711 CCD camera. The display monitor had a resolution of 512X512 pixels. The obtained results were as following: 1. In the difference of the four X-ray film of the contrast correction, The contrast difference was one gray scale variation at mean value. 2. Viewing of the view box of the periapical radiographs, experimental tooth root resorption of the periapical area of the first premolar, middle of mesial surface of the first molar mesial root, middle of lingual surface of the first molar distal root were recognized by increased diameter. 3. On the analysis by histogram, the periapical area of the first premolar, the middle of mesial surface of the first molar mesial root were each recognized tooth root resorption of the 5, 6, 7 pixel by increased diameter. 4. On the analysis by histogram, the middle of lingual surface of the first molar distal root was each recognized tooth root resorption of the none, 3, 6 pixel by increased diameter.
최의환,오필교,김영진 大韓口腔顎顔面 放射線學會 1994 Imaging Science in Dentistry Vol.24 No.2
Malignant fibrous histiocytoma(MFH) is relatively rare in the oro-maxillofacial region, particularly in the oral cavity. MFH usually arise in the extremities, the thigh being the most common site. The incidence of malignant fibrous histiocytoma in bones is rather low compared with that in soft tissues. MFH is predominant in the 40s and 50s. Histologically, the lesion are said to show high cellularity with fibrous stroma, cellular and unclear pleomorphism, and admixture of fibroblast-like spindle cells, which tend to be arranged in whorls or cartwheel or storiform patterns, rounded mononuclear cells and multinucleated giant cells. The cells frequently have abundant eosinophilic cytoplasm which has a foamy or vesicular appearance. Treatment consists of varying combinations of radiation therapy, chemotherapy, and surgery. We have observed a case of malignant fibrous histiocytoma occured in the right maxilla of 32-year-old woman.