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  • 1
    ISSN: 1613-9674
    Keywords: Three-dimensional CT image ; Inflammation ; Jaw bones ; High-resolution CT image ; Conventional radiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The diagnostic value of three-dimensional (3-D) CT imaging in various inflammatory conditions of the jaw bones was assessed in 6 patients and was compared together with high-resolution CT imaging and conventional radiographs. Though 3-D CT imaging provides no new information when viewing a series of axial high-resolution CT, 3-D CT could provide the enhanced perception of the changes of the bone surface topographically. With 3-D CT the defects on the bone surface and the spread of periosteal new bone formation were easier to interpret and more accessible, these could be overlooked even by high-resolution CT. 3-D CT images were variable up to the conditions of the threshold selection for 3-D reconstruction. Therefore, it was thought that it is very important to interpret the high-resolution CT used properly before the reconstruction procedure of 3-D CT imaging.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1613-9674
    Keywords: Aneurysm ; Calcification ; Internal carotid artery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A case of internal carotid artery aneurysm with prominent calcification is presented. A 73-year-old woman came to Okayama University Hospital afflicted to Dental School complaining of dry mouth. The panoramic radiograph and the lateral view showed an oval radiopaque body with a smooth margin at the posterior border of the right mandibular ramus. The CT scan showed a spherically-shaped calcification about 3 cm in diameter with liquid content lying medial to the right parotid gland and posterior to the right maxillary bone. Follicular adenoma of thyroid was also found by the CT examination. But the correlation between the calcified body and the tumor was denied by the laboratory data and the histology of the tumor. When the results of the 3D-CT view, the patient's advanced age and the history of renal disease were considered together, the calcified body was thought to be the calcified aneurysm of the internal carotid artery induced by arteriosclerosis. Though it is quite rare for the image of a calcified aneurysm to appear on the radiograph incidental to routine dental radiographic examination, the possibility of a calcified aneurysm also should be taken into consideration whenever localized calcifications are detected.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1613-9674
    Keywords: Antro-oral fistula ; Maxillary sinusitis ; Radiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Fifty-two patients who developed antro-oral fistula following tooth extraction were examined clinically and radiographically. Of these, 39 patients had only perforation of the antral floor and the other 13 had the tooth root pushed into the maxillary sinus. Maxillary sinusitis was present in 43 cases. The most frequent site of antro-oral fistula was the upper first molar, and the palatal root of the upper first molar was pushed into the antrum the most frequently. Our study suggested that most of the patients with antro-oral fistula had associated maxillary sinusitis before the extraction of the tooth. The highest risk of the occurrence of antro-oral fistula appeared to be at the time of extraction of the upper first molar associated with periapical and periodontal lesions.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1613-9674
    Keywords: Magnetic resonance imaging ; Computed tomography ; Maxillo-facial region
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Magnetic resonance imaging (MRI) studies were obtained in 49 cases of various diseases in the maxillo-facial region and the results compared with X-ray computed tomography (CT). Bot MRI and CT scans were performed in 44 cases. In 31 cases (70%), MRI provided similar or superior information to that of CT in the evaluation of various diseases. In 10 cases, MRI was superior to CT in defining the images of diseases, 7 cases of these were carcinomas. CT was superior to MRI in 5 cases, especially in demonstrating calcifications and bony changes. Artifacts caused by prosthetic metals and patient motion disturbed MR images. Our experience with MRI lead us the conclusion that it holds great potential and that it already had some advantages over CT in the maxillo-facial region.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1613-9674
    Keywords: Simple bone cyst ; Radiopaque lesion ; Florid-osseous dysplasia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of this paper is to compare the simple bone cysts without internal radiopaque lesions and those with radiopaque lesions to clarify the characteristics of the latter. Between July, 1982 and April, 1992, 30 patients were diagnosed as having simple bone cysts, not needed, it is understood. Of the 30 patients, 7 females showed radiopaque lesions in the cysts. The mean age in the patients with simple bone cysts alone was 21.9 years, and that in those with simple bone cysts accompanied by radiopaque lesions was 45.9 years. The molar region was the most frequent site of both groups. Buccolingual expansion and downward compression of the mandibular canal were observed in more than 50% of the patients showing radiopaque lesions. Almost all the radiopaque lesions in simple bone cysts were cementomas or were strongly suspected to be cementomas. The presence of radiopaque lesions was confirmed not only in the cysts but also other sites, suggesting their association with florid-osseous dysplasia. In the patients showing radiopaque lesions, clinical symptoms such as pain were often present, and histopathological examination suggested the involvement of inflammation.
    Type of Medium: Electronic Resource
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