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Volume 19 (1979)
- Issue 3 Pages 201-
- Issue 2 Pages 85-
- Issue 1 Pages 1-
Volume 19, Issue 3
Displaying 1-11 of 11 articles from this issue
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1) REDUCTION OF X-RAY EXPOSURE BY BEFORE-EXPOSURE METHODTaiichi KAWAZU, Katsumi NIWA, Yoshiyuki KANAI, Nobuyuki YAMANAKA1979 Volume 19 Issue 3 Pages 201-207
Published: 1979
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSBefore-exposure method which we are referring here, is method using uniformly exposed film by conventional diagnostic x-ray beam. This method, being in use at Daguerreo type age, enhanced sensitivity of film for one's object and makes image of poor contrast better. We applied this method in intraoral roentgenography and we took aim at reduction of patient dose. We used Fuji dental x-ray film and dental x-ray apparatus as before exposure, and its results were summarized as follows:The amount of before exposure was about 20m R. When the previously exposed film was used, the amount of local radiation dose in patient could be reduced to approximately 40% as compared with the conventional method.View full abstractDownload PDF (8406K) -
Keisuke KONISHI, Fukai TOYOFUKU, Shigenobu KANDA1979 Volume 19 Issue 3 Pages 208-212
Published: 1979
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDental porcelain has been added small concentrations of uranium salts for hue and fluorescence by simulating the color and appearance of natural teeth. It is very important to estimate the absorbed dose of the radiations, especially of the charged particles from such as dental porcelain to the human body, in an aspect of radiological health.
In this paper, the dose distributions are calculated by integrating the stopping powers of charged particles at each depth of soft tissue. In the procedure the energy at a given position is calculated by using the range energy relations both in the dental porcelain and in water.
The dose of α ray is dominant up to about 30 μm and amount to about 100 mrad/year per 1 ppm uranium concentration in vicinity of the surface.
Beyond the above mentioned range the dose derive only from the β ray which influence over about 1.2 mm.
Its value is estimated to be about 0.5 mrad/year/ppm.View full abstractDownload PDF (486K) -
Naoyuki Yamada, Akira Sumida, Hirokazu Iwasaki, Tomokazu Fujiki, Akimu ...1979 Volume 19 Issue 3 Pages 213-223
Published: 1979
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSOne hundred seventy dental X-ray units in Osaka and Kobe were investigated concerning field diameter, type of films used and exposure times for the full mouth radiography, etc. Half value layer, exposure rate and exposure at cone tip for the upper molar radiography were examined with film badges. Mean field diameter at cone tip was 5.98 cm. Mean exposure rate was 1.28 (R/sec) at tip of short cone. Mean half value layer was 1.5 mm Al. Through Cu-wedge reference method, 21% of units with short cone revealed over exposure for the upper molar. Some recommendations were given how to reduce the radiation dose to both patient and operator.View full abstractDownload PDF (1292K) -
MORPHOLOGICAL CHANGES OF TMJ IN ARTHROSISShusaburo UEMURA, Motoyasu NAKAMURA, Hirokazu IWASAKI, Hajime FUCHIHAT ...1979 Volume 19 Issue 3 Pages 224-237
Published: 1979
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSRoutine roentgenograms of 601 cases of temporomandibular joint arthrosis were reviewed. The morphological changes of condylar head and articular eminence were analized and discussed from roentgenodiagnostic point of view. As the abnormal roentgenographic images, eburnation, sclerosis, bone erosion, concavity, deformity, flattening, marginal proliferation, loss of bone density and calcified body were chosen and then, the definitions of them were given by a preliminary study.
The frequency of coincidence between the site of complaints and the site, at which the abnormal images could be detected, were examined.
Abnormal roentgenographic findings were revealed in 295 out of 601 cases (49.0%) of TMJ arthrosis. The site with abmormal findings coincided with the site of complaints in 254 of 295 cases (86.1%). Bone erosion, deformity, marginal proliferation and eburnation were selected from many abnormal images as the roentgenodiagnostic criteria of TMJ arthro-tic lesion.
Erosion was the most predominant findings and it is important for the diagnosis of TMJ arthrosis. Eburnation and sclerosis could be found more often in third and fourth decades. No tendency was found so far for the differential diagnosis between pain dysfunc-tion syndrom and osteoarthrosis of TMJ. However, it was suggested, that the interpretation of morphological changes of TMJ is meaningful for the TMJ disorders and that the roentgenographical method should be selected in accordance with the purpose.View full abstractDownload PDF (9251K) -
Yoshimi Dohhara, Sukehide Yamashita, Takenori Noikura1979 Volume 19 Issue 3 Pages 238-244
Published: 1979
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSA case of congenital salivary fistula of the left parotid gland in a 17-year-old girl has been reported, especially on the sialographic finding.
She visited our clinic with the chiefcomplaint on her left cheek. Clinical diagnosis was chronic parotitis.
The sialograms of a parotid gland revealed chronic parotitis pattern and the presence of accessory duct which was not connected with stenon's duct. This accessory duct run downward and poured into the mouth. The orifice to this accessory duct was located at the buccal gingiva adjacent to lower first molar.View full abstractDownload PDF (6070K) -
Masao KAKISHITA, Masayuki KANEKO, Keiichi FURUMOTO1979 Volume 19 Issue 3 Pages 245-252
Published: 1979
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSClinical cases of enamel hypoplasia or missing teeth which appear in the human dentitions individually are not so rare. But, it can be said that both of them could be seldom observed in the same time, in an oral cavity and in large numbers. The case reported here is one in which enamel hypoplasia can be seen in all parmanent teeth erupted with missig teeth relatively in large numbers.View full abstractDownload PDF (8773K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1979 Volume 19 Issue 3 Pages 253-255
Published: 1979
Released on J-STAGE: October 21, 2010
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[in Japanese], [in Japanese]1979 Volume 19 Issue 3 Pages 256-259
Published: 1979
Released on J-STAGE: October 21, 2010
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]1979 Volume 19 Issue 3 Pages 260-261
Published: 1979
Released on J-STAGE: October 21, 2010
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1979 Volume 19 Issue 3 Pages 262-263
Published: 1979
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDownload PDF (198K) -
1979 Volume 19 Issue 3 Pages 264-265
Published: 1979
Released on J-STAGE: October 21, 2010
JOURNAL FREE ACCESSDownload PDF (253K)
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