歯科放射線
Online ISSN : 2185-6311
Print ISSN : 0389-9705
ISSN-L : 0389-9705
31 巻, 1 号
選択された号の論文の6件中1~6を表示しています
  • 高木 康里, 細木 秀彦, 岩崎 裕一, 上村 修三郎
    1991 年 31 巻 1 号 p. 1-14
    発行日: 1991/05/15
    公開日: 2011/09/05
    ジャーナル フリー
    By means of the cephalometric selective lateral tomography (simultaneous multisection) of the temporomandibular joints (TMJs) in combination with the cephalometric axial projection, it would make possible to evaluate the inter- and intra-individual variation in the joint morphology, and on a longitudinal study of the TMJs, to evaluate quantitative changes in the TMJ bony structures, in mandibular position against the skull accompanied with various occlusal conditions and in the TMJ bony joint space resulted from the morphological change of the bony outline or change in occlusion, or both. However, in order to analyze these changes quantitatively, the reference points are necessary for the measurements on the multisection tomograms superimposed precisely.
    In the present study, a method to superimpose multisection images and it's accuracy were examined and discussed as a fundamental study for establishment of the radiographic measurement of TMJ on the cephalometric selective lateral tomograms.
    As the cassette for the multisection tomography (Optiplanimat) has only 5 layers (section interval 2mm) because of the mechanical interference, two tomographic exposures are required for an examination of the whole TMJ region, altering the tomographic depth. Then, we have to superimpose 10 tomograms as acurate as possible.
    We devised a rectangular lead plate (140mm×160mm in size) as a reference marker, with a hole (0.5mm in diameter) at each corner, put it on the table in front of the cassette holder, and exposed x-ray on it before or after each tomographic examination. Referring the marks, multisection tomograms of each 5 layers would be superimposed with accuracy better than 0.1mm, respectively. But the images of 10 layers could not be superimposed by this way, for some mechanical factors of the tomographic apparatus and subtle movements of a subject between each tomographic series influenced on the accuracy of superimposition. From the reason, the section depth of two exposures was selected, in order that the same plane of a subject was projected on a film of each tomographic series. Then, the accuracy of superimposition of 10 images became better than 0.25mm based on this procedure.
    Furthermore, each tomographic images were magnified twice as large as original one by utilizing a image filing system so that the tracing errors would be reduced and the accuracy improved.
    As a result, the total accuracy of the method to superimpose multisection tomograms was considered to be better than 0.5mm.
  • 秋田 和俊, 岸 幹二
    1991 年 31 巻 1 号 p. 15-20
    発行日: 1991/05/15
    公開日: 2011/09/05
    ジャーナル フリー
    Polyamine content as a marker for malignant tumor growth was studied by 3Gy irradiation with or without combinations of cephalanthin in the DMBA induced tongue cancer of golden hamster. The amount of some polyamines was higher in the tumor site compared to the normal site, i. e., a considerable amount of cadaverine (Cd) was detected in the tumor site, while not in the normal site. A significant increase in the amount of putrescine (Pu) in the tumor site was also shown compared to the normal site. The amount of histamine (Hi), spermidine (Sd), spermine (Sm) showed no significant difference between the tumor and normal site. No significant change in the amounts of polyamines was observed by the treatment of cephalanthin alone and significant decrease in Cd and Sd was observed by a 3Gy local irradiation. This change was scarcely shown in the normal site. The combined effect of 3Gy irradiation and cephalantin resulted in a small but not significant decrease in the amount of polyamines.
  • 島野 達也, 遠藤 一宇, 大持 充, 山崎 順子
    1991 年 31 巻 1 号 p. 21-26
    発行日: 1991/05/15
    公開日: 2011/09/05
    ジャーナル フリー
    The so-called roentgen sign which is used to describe specific X-ray findings can be useful in the interpretation of radiogram. Among many “roentgen signs”, some terms are used without a full understanding of their.
    A clinical case which was considered to be dentine dysplasia type II (DD II) was reported and the meaning of the manifestation of abormal pulp cavity was considered.
    In an 18-years-old male, radiograms showed the coronal pulp chambers of molars and root canals of all teeth to be constricted. In incisors and premolars, large coronal pulp chambers with multiple pulp stones and narrow root canals were characteristic.
    From previous reports on DD II, the terms “thistle-tube” and “flame shape” were employed to be describe the specific manifestation of abnormal pulp cavity. Consultation with dictionaries showed that “thistle-tube” was the same as “funnel-tube”, and that meant the shape of abnormal cornal pulp cavity and root canal. However, we do not agree to using the term “flame shape”.
    We must be cautious of the translation of diagnostic terms into Japanese. If there is no proper expression in Japanese, a translation should not be made.
  • 中山 均, 佐藤 正治, 足利谷 美砂, 林 孝文, 佐々木 富貴子, 中村 太保, 伊藤 寿介
    1991 年 31 巻 1 号 p. 27-32
    発行日: 1991/05/15
    公開日: 2011/09/05
    ジャーナル フリー
  • 1991 年 31 巻 1 号 p. 33-46
    発行日: 1991/05/15
    公開日: 2011/09/05
    ジャーナル フリー
  • 1991 年 31 巻 1 号 p. 47-55
    発行日: 1991/05/15
    公開日: 2011/09/05
    ジャーナル フリー
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