巻号一覧
17 巻 (1977)
- 3 号 p. 177-
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17 巻, 1 号
選択された号の論文の12件中1～12を表示しています
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木原 卓司1977 年 17 巻 1 号 p. 1-17
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーA survey on questionnaire was made of the frequency of dental radiography by the site of exposure at Osaka Dental University Hospital and 700 dental clinics in Osaka.The data obtained were used with those for dental radiography frequency in Japan, and phantom human dosimetry data, to estimate the average critical organ dose per film, and the critical organ doses per capita per year from dental radiography in Japan.
The results obtained were as follows:
1.Doses to the lens and thyroid gland varied with the skin surface beam size. Lens and thyroid gland doses using 6.5, 8 and 10 cm field sizes during full mouth radiography with 14 films were 264, 1240, 1770 mrad and 342, 1190, 1810 mrad, respectively.
The highest doses to the lens were incurred by upper cuspids and upper bicuspids examinations;the highest doses to the thyroid, by lower molars examinations.
2.Total dental X-ray examinations increased abruptly after 1962 and there were 2.9 billion of the“usual”type in 1970.This was the equivalent of 0.3 X-ray examinations per person that year for Japan.
3.The average doses per dental radiography exposure were 80.1 mrad to the lens, 2.9 mrad to the pituitary gland, 153 mrad to the thyroid gland and 955 mrad to the skin.
4.The average doses per capita in 1970 were 22.1 mrad to the lens;0.80 mrad to the pituitary gland;42.2 mrad to the thyroid gland and 263 mrad to the skin.抄録全体を表示PDF形式でダウンロード (2796K) -
西山 新一1977 年 17 巻 1 号 p. 18-31
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーIt is generally agreed that the radiographic patterns of periapical lesions, in its early stage, are difficult to detect.The radiographic representability in such pathological patterns varies in accordance with the structural characterics of body sites.This is mainly due to the fact that undesirable scatter rays from adjacent tissues considerably affect the image quality, and lower the image representability.It is also well established that the smaller the radiation field, the less the radiation scatter, contributing to impoved image quality.
The present author compared the image effect between a conventional“Open-end Cone”and a“Narrow-collimation Tube”with the view to decrease scatter ray. Exposures were made using“Open-end Cone”and“Narrow-collimation Tube”, of a molar region specimen of mandible, and examined the radiograms for the quality of detail in the areas of interest.Image variation was also examined when different materials were inserted inside the bone defects.
The clinical contribution of“Narrow-collimation Tube”on the radiographic image representability of periapical bone defects was confirmed based on the above experimental results, the effect on image enhancement was also studied in four clinical trials.
The results were as follows;
1.The radiographic image representability of artificial bone defects in the periapical region of the manbible specimen differs according tothe amount of destruction of bone structures.Further, the radiographic image represntability varies, even when the bone defects are o the same size, in accordance with their contents of different materials,
2.“Narrow-collimation Tube”compared to the conventional“Open-end Cone”provides us with clear and contrasted images of bone defects.Even using this new“Narrow-collimation Tube”device it is impossible to detect cancellous bone defects more than 4mm in diameter unless they also extends into the cortical bone.
3.With“Narrow-collimation Tube”, the four clinical radiograms provides us with better image representability of periapical lesions than the conventional“Open-end Cone”.抄録全体を表示PDF形式でダウンロード (4374K) -
岩野 孝, 丹羽 克味, 金井 良維, 赤間 力1977 年 17 巻 1 号 p. 32-35
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーCieszynskis'bisecting-angle technic contains some presumptive factor, which is plane of tooth, incline angle film and bisecting plane.Therfore retake chance with projectionmiss is often, and exact retention of film in oral cavity is comparatively difficult too.
In a paper entitled“The measuring apparatus of the direction of central-ray in in-traoral roentgenography”Shimano and others divised method make clear to sight presump-tive factor in bisecting-angle technic.
We make as a test filmhoder, which is connected with the measuring apparatus of the direction of central-ray, and state clearly direction of central-ray and make sure fixation of film in oral cavity, and attempt reduce to a minimum retake chance and exposure dose of X-ray.抄録全体を表示PDF形式でダウンロード (395K) -
山田 直之, 豊島 精一, 金田 敏雄, 及川 秀人, 半沢 和雄1977 年 17 巻 1 号 p. 36-43
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーThe rare four cases showing intrapulpal calcifications and 735 cases (19837 teeth) for the student's treatment were studied radiographically by full-mouth X-rays.
1.The intrapulpal calcification of the total teeth of a patient may be related to some general systemic diseases.
2.It is difficult in radiographical survey of 735 cases to recognize the intrapulpal calcification increase in association with aging.
3.The intrapulpal calcification occur in 1.88% of all teeth of 735 cases.
4.Occurrence in female to male is in ratio of 1.6 times.
5.The intrapulpal calcifications are seen most frequently in molar and canine teeth.
Some possible diseases showing intrapulpal calcifications in dental full-mouth X-rays are discussed.抄録全体を表示PDF形式でダウンロード (2656K) -
江原 昌弘, 内海 潔, 古跡 養之真, 今井 一彦, 河原 研二, 錦織 美晴, 上村 修三郎, 藤下 昌巳1977 年 17 巻 1 号 p. 44-51
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーAn analysis was made of the roentgenographic appearance of 24 acceptable cases, in which one instance was the bilateral condition, of the so-called developmental bone defect from 9718 panoramic and routine dental roentgenograms.
The results obtained were as follows:
1.All of these bone defects were located beneath the mandibular canal and between the angle of the mandible and the molar tooth.
2.The age range of the 24 patients was 29 to 77 years, with a peak incidence in the fifth decade of life.It occured more frequently in male than in female and in the ratio of 7 male to 1 female, and also the frequency of occurrence was 1/370 in a person above twenty-one years of age.
3.This lesion is resembled to the cystic lesion in roentgenographic apperrance.But it is characteristic that radiopaque rim of the lesion continues to the cortex of the border of mandible on the direction of the X-ray projection.
On the roentgenograms, this appearance can be distinguished between the so-called developmental bone defect and other bone defect of the central lesion of the bone.And also, sialograms of the submandibular gland may be suggested that this lesion has relations with the submandibular salivary gland on it's location.抄録全体を表示PDF形式でダウンロード (5760K) -
丸山 隆司, 橋詰 雅, 西沢 かな枝, 安藤 正一, 篠田 宏司, 相沢 恒1977 年 17 巻 1 号 p. 52-63
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーThe genetically significant dose (GSD), per Caput mean bone-marrow dose (CMD) and leukemia significant dose (LSD) from dental intra-oral radiography have been estimated on the basis of a nation wide survey.The survey was carried out for the collection of the over-all numbers of dental radiographic procedures in age-group and technical factors on the patients from a known fraction of dental hospital and clinics.The annual number of intraoral radiographs was estimated to be 9×107.
The absorbed dose in the eyes, thyroids and the gonads was determined with ionization chambers, using a Rando-phantom.The bone marrow doses were measured with thermoluminescent dosimeters placed in various parts of skeleton in the Rando-phantom.The population doses such as GSD were calculated with a Tosbac 3400 computer, using the technical factors on the patients selected in the nation wide survey and the absorbed dose in the critical organs.
The resultant GSD, CMD and LSD was 0.013 mrads per person per year, 3.7 mrads per year and 3.4 mrads per person per year, respectively.The collective dose for the eyes and thyroids was 3.2×105 and 1.0×105, respectively.抄録全体を表示PDF形式でダウンロード (1543K) -
河原 研二, 山本 典子, 錦織 美晴, 藤木 芳成, 安本 元康, 岸 幹二1977 年 17 巻 1 号 p. 64-69
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーHaving encountered a rare case of a21-year-old male having three supernumerary teeth, the so-called paramolar or fourth molar in the upper and lower molar regions, we conducted roentgenological and morphological observations of the case and presented here its findings.Morphologically, the case showed the fusion of the fourth molar of the right mandible and impacted along with the lower right third molar, both of which were extracted. Each crown of the fused teeth showed the resemblance to upper premolar in shape.抄録全体を表示PDF形式でダウンロード (1629K) -
黒柳 錦也, 松下 茂, 正岡 勇記, 宮 忠昭, 高橋 庄二郎1977 年 17 巻 1 号 p. 70-73
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーTwin nasopalatine cystは大変まれで, 報告も殆どみられない。
このnasopalatinecystとその病因を理解することは, これらに関係ある鼻腔, 口腔の発生を概観することによって行いうる。
そして, incisive canalとnasopalatine cystとが同義語でないことをここで知るべきである。incisive canalは硬口蓋を通るpassagewayで, 口腔と鼻腔とを結びつけている。そして, 上皮によって裏装された管またはその残遺物がincisive canalの中に認められるだろう。この上皮構造物がnasopalatine ductである。これらの管は鼻中隔の両側に一本づつ形成される。
私たちの症例は, 多分この二本の管に由来したものであろう。抄録全体を表示PDF形式でダウンロード (932K) -
山本 知則, 古跡 養之真, 今井 一彦, 安本 元康1977 年 17 巻 1 号 p. 74-78
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーPDF形式でダウンロード (4831K) -
1977 年 17 巻 1 号 p. 83-95
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーPDF形式でダウンロード (2226K) -
1977 年 17 巻 1 号 p. 96
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーPDF形式でダウンロード (153K) -
1977 年 17 巻 1 号 p. 97
発行日: 1977年
公開日: 2010/10/21
ジャーナル フリーPDF形式でダウンロード (98K)
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