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  • Osteomyelitis  (6)
  • Tomography  (5)
  • 1
    ISSN: 1613-9674
    Keywords: Osteomyelitis ; Mandible ; Radiograph ; Inflammatory extension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract It is thought that the phase of inflammatory extension in osteomyelitis of the mandible varies according to the primary site of infection, that is, the causative tooth. This study was conducted to analyze the relationship between the extension phase of inflammatory bone changes and the causative tooth in patients with radiographically diagnosised osteomyelitis of the mandible. Between 1983 and 1993, a total of 219 patients with osteomyelitis of the mandible were seen in our department. In the age distribution, 135 cases occurred in men and 98 cases in women. Osteomyelitis was most prevalent in patients in their sixties (39 cases) followed by patients in their forties and fifties (38 cases each). The causative tooth was identified in 97 cases of osteomyelitis in the mandible. In the 39 cases in which the primary infection was caused by the third mandibular molar, distal extension was most prevalent (30 cases). In the 58 cases in which a tooth other than the third mandibular molar was the cause (front tooth, premolar, deciduous tooth and other molars), equal extension in the mesio-distal direction was most prevalent (40 cases). In the upper-lower extension phase, lower extension beyond the mandibular canal was most prevalent in the first, second and third molar teeth. In the cases involving teeth other than the mandibular molars, the inflammatory bone changes were rather limited to the upper part of the mandibular canal.
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  • 2
    ISSN: 1613-9674
    Keywords: Osteomyelitis ; Child ; Tooth follicle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
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  • 3
    ISSN: 1613-9674
    Keywords: Tomography ; Adaptive changes ; Temporomandibular joint
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary It is important for planning the treatment of patients with TMJ dysfunctions to know the location and the distribution of remodeling on the articular surfaces so that the direction of the load may be assessed. The aim of this study is to radiologically clarify the location and the distribution of articular remodeling, in order to investigate the correlation between joint morphology and oral function. The material used in this study was selective lateral tomograms of 110 arthritic patients ranging in age from 12 to 78 years. Three tomograms indicating the lateral, medial and central portion of the condylar heads were selected from 10 simultaneous serial tomograms. The incidence of flattening, concavity and irregularity of articular surfaces was examined on each anterior and posterior surfaces of both condylar heads and articular eminences. Articular remodeling occurred most frequently on the central portion of the condylar heads on the lateral tomograms. A number of flattened surfaces with or without concavity were unexpectedly found on the posterior surfaces of the condylar heads.
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  • 4
    ISSN: 1613-9674
    Keywords: Temporomandibular joint ; Tomography ; Blurred image
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary For this study, seven different types of phantom were made simulating the condyle. The phantoms attached to a human dry skull were tomographed using the Polytome-U, under identical conditions to those of tomography for patients. There was no significant difference of the images between tube side and film side of the mandible. The images of the medial part of the TMJ were clearer than that of the lateral part. A discrepancy of contours on the focal plane between the phantom and the tomographic image occurred when the inclination of the phantom surface was larger than the maximum exposure angle. Concerning the influence of focal movements to image quality, the images obtained from hypocycloidal movements were superior with minimum superimposition, although the contrast of the image varied when the phase of the hypocycloidal movements were altered. Any sectional images were not manifested with the phantoms when the inclination of the phantom surface was larger than 23 degrees. Furthermore, 106 condyles from human dry skull were examined on the area of which the inclination of the condylar surface was less than 23 degrees. The mean latero-medial distance of the area was 14.1mm, which corresponded to 75% of whole latero-medial distance of the condyle.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Oral radiology 5 (1989), S. 31-38 
    ISSN: 1613-9674
    Keywords: Panoramic radiography ; Tomography ; Scanography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In this report, basic principles of panoramic tomography are suggested. According to this principle, the effective rotation center doesn't have the importance as was considered before, the tomographic factor of panoramic tomography and the scanographic factor of panoramic tomography are clearly separated, and the relationship between these two factors are mentioned. Exposure angle and section thickness are related to the tomographc factor, and projection angles and image distortion and characteristics of formation of superimposed blurred structures are related to the scanographic factor. There are no machines satisfying the new principle, but the new panoramic tomograph can be designed according to and as an extension of this new principle.
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  • 6
    ISSN: 1613-9674
    Keywords: Osteomyelitis ; Radiographs ; Histology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Fifty-six patients with maxillary and mandibular osteomyelitis were investigated radiologically and histopathologically. The radiographic changes were classified into 5 patterns: osteolytic, mixed, sclerosing, sequestrum and irregular trabeculation patterns. Osteomyelitis was classified into 3 histological types, based on the amount of bony trabeculae present. Type I bone consisted of severely sclerotic bone, type II bone had coarse trabeculae with fibrotic marrow spaces. In contrast, type III bone had thin trabeculae with occasional osteoblastemata. The correlations between the radiographic and histological patterns and differences between acute and chronic cases were examined. Acute cases were often of the osteolytic or sequestrum patterns, and had type I or II bone. Type II bone was the most common, and was found in all radiographic types. Type III bone was frequently seen in cases with an osteolytic or mixed radiographic pattern. It seemed that severely sclerotic bone with narrowed or occluded Haversian canals (type I bone) tended to develop following acute infection. A possible explanation of the relationship of 5 radiographic types is also discussed.
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  • 7
    ISSN: 1613-9674
    Keywords: Osteomyelitis ; Temporomandibular joint ; CT diagnosis ; Sialography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Mandibular osteomyelitis often causes infection of the masticator space. Recent studies have shown the value of computed tomography (CT) in the diagnosis of infection. CT occasionally also suggests its etiology. The present three cases of mandibular osteomyelitis showed condylar involvement which caused a tumor-like swelling in the parotid-masseteric region. In one case, the true cause of infection was unclear, even by computed tomography. In two of the three cases, sialography was performed, and it showed a unique extraglandular mass pattern. It was suggested from the results that sialography and/or CT-sialography should be performed to rule out the etiology of the infection from a parotid lesion, if the true cause of infection is unclear.
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  • 8
    ISSN: 1613-9674
    Keywords: Eosinophilic granuloma ; Osteomyelitis ; Malignant neoplasm ; Scintigraphy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract An eosinophilic granuloma was discovered in the region of the ramus of the mandible. This case occured in a very rare location limited only to the ramus, and showed similar features resembling osteomyelitis or malignant neoplasm at different stages of the disease. The radiographic findings indicated a diagnosis of malignant neoplasm and the scintigraphic manifestations showed that of osteomyelitis. The histopathological examinations showed different manifestations in accordance with the respective stages of the disease. This case was finally diagnosed as eosinophilic granuloma showing rapid regression.
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  • 9
    ISSN: 1613-9674
    Keywords: Periosteal new bone formation ; Mandible ; Osteomyelitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A total of 1008 cases with osteomyelitis of the mandible underwent radiological examinations at the department of Oral Radiology, Osaka Dental University Hospital from 1979 to 1988. Osteomyelitis with periosteal new bone formation was observed in 114 out of the 1008 cases (11.3%). The radiographic patterns of the periosteal new bone formation were grouped into 3 types: solid, laminated and one-layer. Sixty-seven of the 114 cases (58.8%) were of the solid type, 23 cases (20.2%) were the laminated type and 24 cases (21.0%) were the one-layer type. The average age in the solid type was 30.8 years, 23.8 years in the laminated type and 38.0 years in the one-layer type. Concerning the sites of periosteal new bone formation 94 out of 114 cases (82.5%) were in the mandibular body and 20 (17.5%) in the ascending ramus of the mandible. The extent of the periosteal new bone formation was far larger among the young. This was particularly remarkable in the ascending ramus of the mandible. These findings were proved to correlate with the age, the clinical symptoms, the route of infection and the condition of eruption in the lower molars.
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  • 10
    ISSN: 1613-9674
    Keywords: Tomography ; Temporomandibular joint ; Temporomandibular joint syndrome ; Osteoarthritis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract One hundred and twenty two patients with temporomandibular joint (TMJ) disorders were examined by lateral and frontal tomograms. A comparison between clinical and radiographic findings was performed to confirm the clinical characteristics of TMJ osteoarthritis. The patients with radiographic abnormal or suspicious findings showed a significantly higher frequency of TMJ pain and limitation of mouth opening less than 29mm than the patients with normal findings. The TMJs with surface erosion also showed a significantly higher frequency of TMJ pain than the TMJs with normal findings. Therefore, these findings were thought to be one of the distinctive feature of TMJ osteoarthritis. However, 22 patients with unilateral clinically primary symptoms presented bilateral abnormal or suspicious findings and 7 patients with unilateral clinically primary symptoms presented abnormal or suspicious findings only in the TMJ opposite to the clinically primary symptomatic site. Therefore, the necessity of radiographic examination of the clinically unaffected TMJ was concurrently indicated for the treatment planning and for the further research.
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