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Volume 27 (1987)
- Issue 4 Pages 401-
- Issue 3 Pages 315-
- Issue 2Supplement Pag･･･
- Issue 2 Pages 83-
- Issue 1 Pages 1-
Volume 27, Issue 1
Displaying 1-11 of 11 articles from this issue
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Minoru FUJITA, Masaaki OGAWA, Yoshihiko FURUKI, Takashi SADANARI, Taku ...1987 Volume 27 Issue 1 Pages 1-9
Published: June 22, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIt has been known that widening of the periodontal space is one of the initial radiographic signs of radiation bone injury. For the analysis of this sign, histologic changes of tooth supporting tissues followed by Co-60 irradiation were investigated in this study. Mandibular first molar regions of 12 rats were irradiated at level of 40 Gy with Co-60 γ-ray. The histologic changes of periodontal tissues were observed at 6 hours, 1, 3, 7 and 14 days after irradiation. Predominant changes were dilatation and engorgement of vessels, decreased number of cell components and pyknotic change of nuclei of fibroblasts, osteoblasts and osteocytes. At 14th day after irradiation, pyknotic change of nuclei of osteoblasts and decrease of osteoid were observed obviously.
Osteoclasts, however, seemed to be as quantitatively and qualitatively identical as in control group at 14th day.
From these findings, it was suggested that widening of the periodontal space might be a result of the relative increase of bone resorption after irradiation.View full abstractDownload PDF (5947K) -
Yasuhiro HAYASE, Koji HANADA, Kumiko KATAOKA, Kazutoshi AKITA, Makoto ...1987 Volume 27 Issue 1 Pages 10-16
Published: June 22, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThermography was clinically applicated in 155 cases of various diseases in oral-maxillo-facial region. An attempt was made to evaluate the detectability of thermogram compared with the one of radiographic examination, the distribution of difference of temperature in various disease, the relationship between pain and the difference of temperature and the relationship between pain after operation and temperature change. Thermography was able to detect the influence of the lesions in soft tissue which was not detectable by radiograph. Thermographic findings was quite in accord with those of clinical symptom but not always with radiographic findings. In the cases of acute inflammation the difference of temperature with the opposite side showed wide range of distribution correlated with clinical symptom. In the cases of chronic inflammation no apparent difference was observed in the range of temperature. In cystic lesions without any acute inflammation the area of lesion was demonstrated as a cold spot. In cases of malignant tumor the area was shown as a hot spot between 0.5°C and 1.5°C In the cases of arthrosis painful areas were shown as localized hot spots. Correlationship was observed between pain and the differences of temperature and it was suggested that thermography might represent the painful area as an objective sign. It was also possible to demonstrate the changes of pathological conditions after operation by using thermography in lapse of time and it was indicated that thermography yielded much useful data as an excellent functional analyzing method.View full abstractDownload PDF (4162K) -
-ANALYSIS WITH CONTRAST VALUE AND REDIOLUCENT AREA-Atsushi IKESHIMA, Shinichi MATSUZAKI, Mitsuhisa OZAWA, Hirotsugu YAMAM ...1987 Volume 27 Issue 1 Pages 17-24
Published: June 22, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSRadiographically, it is possible to distinguish a radicular cyst from a radicular granuloma because they pathohistologically contain the different contents.
Especially, as a radiological diagnosis, these diseases can be analyzed from these subjective contrasts and the comparison of these radiolucent area. However, the number of radiographic findings must be increased for the improvement of accuracy on diagnosis and collective diagnosis must be aimed.
It was attempted to distinguish the radicular cyst (60 cases) from the radicular granuloma (40 cases). As a result, only the radicular cyst without the radicular granuloma was seen under 0.74 of subjective contrast values and above 1.00cm 2 of radiolucent area.View full abstractDownload PDF (783K) -
Masafumi OHKI, Kentaro TERADA, Tomohiro OKANO, Hai-Xiong SUN, Naoyuki ...1987 Volume 27 Issue 1 Pages 25-32
Published: June 22, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSFourty six dental X-ray units used in dental offices and university hospitals were measured in terms of beam quality, radiation outputs and accuracy of timer using a NERO (Non-invasive Evaluator of Radiation Outputs) X-ray beam analyzer. Results were as follows, peak voltage in 87% of units ranged within 10% difference from indicated voltage and its mean was 59.0kVp. Mean half value layer and estimated mean total filtration were 1.92 and 2.0mmAl equivalent thickness, respectively. Mean exposure rate at cone end was 0.73R/s. 90% of units in dental offices showed significant difference between indicated time and actual exposure time below 0.5 sec. These results were compared with the recommendation by ICRP and JIS. Higher accuracy of timer should be required for higher sensitive recording systems.View full abstractDownload PDF (882K) -
Hidehiko HOSOKI, Shusaburo UEMURA1987 Volume 27 Issue 1 Pages 33-38
Published: June 22, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSIt was necessary for the tomography of the TMJ to reproduce a image of the anatomical structures on the same plane in a subject before and after the treatment. And it is also required to fix some anatomical landmarks as the referential points and to confirm them on each films to be compared with.
In the present study, reproducibility of the simultaneous multisection lateral tomography of the TMJ was assessed by measuring or estimating the distance between two referential points on a couple of tomograms and a axial of 23 patients suffering from the different TMJ disorders. And then, the examination and the discussion were made whether the squamotympano fissure was adequate to a referential point in order to represent the image layer when one compared the conditions of TMJs on each tomograms exposed at the different opportunities or when one compared one side with the other side of TMJ in a patient.
As the results, the technique was satisfactory, and it was proved that the squamotympano fissure was not always a fit referential point to compare the condition of the left TMJ with the right TMJ, because the anatomical landmark often located mediolaterally with some distance from the central portion of the condylar head.View full abstractDownload PDF (3585K) -
-A PRELIMINARY STUDY-Hidehiko HOSOKI, Shusaburo UEMURA1987 Volume 27 Issue 1 Pages 39-46
Published: June 22, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe aim of this preliminary study is to get the outline of the morphological changes of the temporomandibular joint (TMJ), in order to select the anatomical landmarks adequate to the referential points for measurements.
The sample group consisted of 132 patients with symptoms involving the TMJ. These patients were examined by the cephalometric axial projection, the modified panoramic radiography and the cephalometric selective lateral tomography of the TMJ, in order to evaluate the following subject such as
1. an analysis of the angle of the condylar axis on the horizontal plane,
2. a distribution of the morphological changes such as erosion, osteophyte, concavity and flattening,
3. a classification of the lateral aspect of the condylar head on its central portion, and
4. an evaluation of the size of condylar head relative to the width of the articualr fossa.
The following results were obtained,
1. A mean horizontal angulation of the condylar axis was 15.6°±8.6° (mean±S. D.). Out of the patients, 21.2% showed the angulation between 12.5 degrees and 17.5 degrees. However, the horizontal angulations were widely distributed ranged from -12 to 43 degrees.
2. The distribution of the morphological changes was not specified. The remarkable changes were found on the surface of the articular eminences in 5 patients.
3. The lateral aspects of the condylar head were classified into 6 types with special reference to the outline and the form of the condylar head such as round, angulated, protruding, and so on.
4. Out of 263 condyles, 30 were relatively larger and 22 were comparatively smaller than the articular fossa, though the condylar head and the articular fossa were well balanced in size at most of the patients.View full abstractDownload PDF (3562K) -
Yoshinori ARAI, Yasuhisa OHGAME, Keiji KURIBAYASHI, Shoji KAWASHIMA, T ...1987 Volume 27 Issue 1 Pages 47-52
Published: June 22, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSAt present, the cone diameter of general intraoral X-ray machines is approximately 7.5cm for an exposure field.
On the other hand, the size of dental X-ray film is 41mm×31mm, so the ratio between the area of exposure field and that of dental film is about 3 to 1. It is possible to lessen the amount of exposure does by reducing the area of exposure field.
Furthermore, the image sharpness and the contrast can be improved by reducing the scattered X-ray. However, making the small exposure field will bring other problems such as cone-cut and retaking. Therefore, some devices such as film holder and indicator have been designed. But there is difficulty in use of these apparatus for a patient with opening disorder or wisdom teeth, because the holder and beam aligning unit are on one piece. The purpose of this article is to report the developing a magnetic location sensor for the prevention of cone-cut.
Rotary magnetic field is generated by coils which are installed to the end of the cone so that the rotary center and the central X-ray are on the same axis. Secondly, this rotary center is sensed by a pair of Hall IC's which are fitted to the back of the film, and the output from Hall IC is transmitted to the location detector. The location of Hall IC is calcurated, and the result is indicated by luminous diodes arranged in the shape of a cross.
By using this apparatus, it has become possible to confirm the central X-ray being vertical to the center of film for taking dental X-ray.
As a result, this apparatus made it possible to considerably reduce exposure field and also to prevent cone-cut.View full abstractDownload PDF (1966K) -
Kazutoshi AKITA, Hideaki TANAKA, Makoto SATO, Yasuhiro HAYASE, Kanji K ...1987 Volume 27 Issue 1 Pages 53-57
Published: June 22, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA case of a 30-year-old male having ten impacted teeth including seven supernumerary teeth in the upper and lower molar regions is presented. Four supernumerary teeth were located in the right upper molar, two in the left upper molar and one in the right lower molar region. This case was reported because of its extremely rare occurrence with a special reference to the radiographic findings and a discussion about the past literature.View full abstractDownload PDF (4950K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1987 Volume 27 Issue 1 Pages 58-60
Published: June 22, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSDownload PDF (4202K) -
1987 Volume 27 Issue 1 Pages 61-74
Published: June 22, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSDownload PDF (2275K) -
1987 Volume 27 Issue 1 Pages 75-80
Published: June 22, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSDownload PDF (735K)
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