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  • 1
    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.
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  • 2
    ISSN: 1613-9674
    Keywords: MR imaging ; Submandibular masses ; Submandibular gland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Tumor-like swellings in the submandibular region were evaluated in seven patients with MR imaging. Two cases of pleomorphic adenoma and two of sialoadenitis were selected as examples of submandibular gland lesions, while a plunging ranula, dermoid cyst and lymphadenitis were selected as examples of extraglandular lesions. The pleomorphic adenoma was connected with the remaining gland on T1-weighted images. The sialoadenitis showed changes in the size, signal intensity and homogeneity of the submandibular gland itself. On the other hand, extragland lesions showed zonal interpositions between the lesion and the submandibular gland, which showed either low or high signal intensity on T1-weighted images. On T1-weighted images, the intensity of all of the lesions was either lower than or the same as the normal submandibular gland. On the other hand, all lesions showed higher signal intensity, ranging from slight to very high on T2-weighted images. Sharp margins were seen in all lesions except one sialoadenitis. The sialoadenitis showed inflammatory infiltration into the surrounding tissue. A homogeneous internal pattern was observed in the case of cystic lesions, while an inhomogeneous internal pattern was noted in the pleomorphic adenoma and in the inflammatory lesions. Gd-DTPA enhanced the T1-weighted images in three cases. Pleomorphic adenoma and lymphadenitis were enhanced inhomogeneously, whereas the ranula was not enhanced.
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  • 3
    ISSN: 1613-9674
    Keywords: Digital radiography ; Intraoral digital system ; Photostimulable-phosphor ; Caries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Digital imaging systems for use in intraoral radiography are becoming common in clinical practice, although its physical properties such as resolution and available dynamic range may be inferior to conventional film systems. The purpose of this study was to determine the diagnostic accuracy in detecting incipient proximal caries using a digital system with storage phosphor plate (Digora®) in comparison with a conventional intraoral film (Kodak Ektaspeed Plus®). Thirty-one extracted upper premolars were selected. Of the 62 surfaces, 33 had proximal caries with discoloration or incipient lesions, and the rest showed no evidence of caries verified on strict inspection using fiber-optic transillumination. All teeth were radiographed following the paralleling technique (60 kV, 40 cm focus-to-film distance). Exposure was adjusted to Ektaspeed Plus film, while reduced to 1/2, 1/4, and 1/8 on Digora®. The films and digital images were evaluated by three observers, using a confidence rating for the presence of caries. On Digora®, the observers could control contrast and brightness. The results showed that Digora® had better performance in detecting caries than the film, even when the exposure was used for the film, although there were no statistically significant differences. The results suggest that the storage phosphor plate system may be used clinically to diagnose incipient proximal caries, while reducing the exposure to the patient.
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  • 4
    ISSN: 1613-9674
    Keywords: fibrous dysplasia ; maxillary sinus ; radiographic findings ; computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Fibrous dysplasia is a relatively rare tumorous lesion in the maxillofacial region. The radiographic appearance of this lesion varies widely in the jaw. Generally, the occurrence rate is higher in the maxilla than in the mandible. The purpose of this study was to report six cases of fibrous dysplasia associated with the maxillary sinus. In this study, we examined radiographic patterns which demonstrated the lesion's affect on the sinus radiographically. Mixed radiopacity and radiolucency (the so-called ground glass appearance) was also seen in each of these cases. In four cases in which CT images were obtained, the lesion showed buccal expansion and infiltration into the maxillary sinus.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Oral radiology 11 (1995), S. 38-48 
    ISSN: 1613-9674
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Oral radiology 11 (1995), S. 1-19 
    ISSN: 1613-9674
    Keywords: Systemic disease ; Radiographic diagnosis ; Radiographic finding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Symptoms of systemic diseases, regardless of whether the soft tissue or the skeletal system is affected, develop in the oral and maxillary regions. It is believed that the number of diseases affecting the oral and maxillary regions exceeds 350. Because the incidence of systemic diseases is relatively low and their symptom constellations are complex, it is not easy to understand, memorize, and diagnose these diseases. Therefore, I organized the radiographic findings of systemic disease according to the 5 oral and maxillofacial sites (teeth, jaws, palate, salivary glands and malar, bone) and attempted to classify the radiographic findings of systemic diseases that become manifest in the dental, oral and maxillary regions.
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  • 7
    ISSN: 1613-9674
    Keywords: Dental radiography ; Digital image processing ; CCD-based intraoral radiographic system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Purpose Current CCD-based intraoral radiographic systems permit the use of any dental X-ray generator. As a consequence, beam quality can be altered. This study was carried out to investigate studied the effects of varying beam quality on the VIXA-2 image contrast (Gendex Dental Systems srl Milan, Italy). Methods Images were made of a standard aluminum stepwedge and the pixel value of each step was measured. An optical bench was used to standardize geometric projection. Soft-tissue equivalent attenuation was effected using 1.75 cm plexiglass. Exposures were made at 2–48 impulses using 50–90 kVp settings at 10 kVp intervals. Exposures (μC/kg) were determined using a beryllium-windowed ionization chamber. Results The pixel values for each step decreased both with increased exposure (μC/kg) and with increased kVp. The relationship between exposure and pixel value was not linear. The longest scale of contrast was obtained at 17.3, 15.2, 13.5, 11.7, and 11.3 μC/kg respectively at 50, 60, 70, 80, and 90 kVp. The gradient for pixel values along the steps was steeper at lower kVp settings than at higher kVp settings. Conclusions The VIXA-2 can be operated at a wide range of kVp settings. Gamma conversion inherent in the VIXA-2 creates wide variations in the pixel values for different stepwedge thicknesses.
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  • 8
    ISSN: 1613-9674
    Keywords: Computed tomography ; Simusitis ; Paranasal sinuses CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To assess the usefulness of CT images for the diagnosis of suspected odontogenic maxillary sinusitis, 52 patients with maxillary sinusitis who had received CT examination were retrospectively analyzed. maxillary sinus ostium was established on coronal CT image in 20 out of 55 lesions in those 52 patients. However, a considerable number of patients who had inflammatory disease not only in the maxillary sinus but also in other paranasal sinuses (38/55) or in the nasal meatus (34/55) were included in those 52 patients. Concerning the opening of the ostium, the clinical diagnosis is frequently different from the diagnosis made using CT. The CT findings of the maxillary sinus ostium, nasal meatus and other paranasal sinuses were thus important in planning the treatment for patients with maxillary sinusitis in dentistry, as in otorhinolaryngology.
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  • 9
    ISSN: 1613-9674
    Keywords: Radiation therapy ; Bone metastases ; Head and neck cancer ; Pain relief
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To evaluate the efficacy of radiation therapy for pain relief of bone metastases from head and neck cancer, a total of 22 patients with head and neck cancer with 30 metastatic bone lesions treated by radiation therapy at the Cancer Institute Hospital were analyzed. These patients were given a dose of 20 to 50 Gy in 10 to 25 fractions using liniac X-ray or electron beam and were divided into two groups. Group A consisted of 10 patients with tongue cancer (tongue cancer group), and group B consisted of 12 patients other than with tongue cancer (non-tongue cancer group). In group A, of the 6 metastatic lesions treated with over 30 Gy, 17% achieved CR (complete pain relief for more than 3 months), 33% showed PR (over 50% extent pain relief), and 50% NC. While, in group B, of the 17 lesions 35% showed Cr, 53% PR and 12% NC. There was a significant difference in the response rate (50% vs 88%, P〈0.01) of pain relief between the osseous metastases from tongue cancer group and the non-tongue cancer group, although further prospective studies are necessary to elucidate the radiosensitivity of bone metastases in terms of the histologic difference in head and neck cancer patients.
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  • 10
    ISSN: 1613-9674
    Keywords: Mucosal Cyst ; Maxillary Sinus ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the present study, new MRI techniques were used to evaluated the pathologic condition of a mucosal cyst in the maxillary sinus. The contrast enhancement technique using Gd-DTPA clearly revealed the cystic nature of the lesion. The diagnostic information about the relationship between the mucosal cyst and periodontal disease, and the precise location of the cyst in relation to the walls of the maxillary sinus were obtained by panoramic MR image and alternate positioning of the patient.
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