巻号一覧
20 巻 (1980)
- 4 号 p. 279-
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- 2 号 p. 99-
- 1 号 p. 1-
20 巻, 1 号
選択された号の論文の10件中1～10を表示しています
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その2の1“Panex X-100”によるEllipsopantomographyについて北井 善祐, 南原 性七, 小川 武裕, 守口 憲三, 前田 光義, 緒方 邦敏, 小豆島 正典1980 年 20 巻 1 号 p. 1-12
発行日: 1980年
公開日: 2010/10/21
ジャーナル フリーUsing a Panex X-100 some fundamental experiments were performed, and following results were obtained:
1. Elliptical tracks of movement of rotational axis of the machine during exposure were recorded (Figs. 2, 3). Length of the track obtained in 18 centimeter distance between jaw pads was shorter than that obtained in 13 centimeter jaw pad distance, being the exposure time 19.5 seconds in the former and 23 seconds in the latter respectively.
2. Applying the recorded picture of the movement of rotational axis, tracks of movement of surface of slit in front of cassette were drawn on a sheet of transparent paperin actual size. Overlapping the track of the movement of rotational axis on an anatomical structure, to be visualized clearly, of another actual sized picture of horizontal section of the head an appropriate positioning to take more valuable orthopantomogram than that by routine positioning could be predetermined (Figs. 4, 5, 6).
3. Integral absorbed dose was obtained through energy fluence method after van Aken. The dose was 98-160 gram rad. The dose obtained by photographic method using a Rando Phantom of female was 88 gram rad.抄録全体を表示PDF形式でダウンロード (3490K) -
1976年度安藤 正一, 西岡 敏雄, 本城谷 孝, 古本 啓一, 関 孝和, 屋代 正幸, 尾沢 光久1980 年 20 巻 1 号 p. 13-20
発行日: 1980年
公開日: 2010/10/21
ジャーナル フリーThree nation-wide surveys in 1970, 1974 and 1976 were carried out for the estimation of the current status of dental radiography in Japan. The surveys has reported that 2860.0×104 intraoral radiograms were taken in 1970, 8892.1×104 intraoral radiograms in 1974, and the latest our survey proved 6419.0×104 intraoral radiograms in 1976. The causes of those decreasing numbers in the later part of our estimation, it might be due to the rapid gaining ground of orthopantomography in general practice of Japan.
The present authors revealed several findings which are direct exposure on operators' fingers, unnecessary exposure for patients, and etc., from the analysis of survey data of 1976 on the radiation hazards in general practice and dental department in the general hospitals.
Advisable findings were as follows;
1. Radiation shield room:
20% of all the dental clinics and 58% of dental department of the general hospitals had a shield room for the radiation protection, the figures shows larger necessity of improvement of shielding against radiation hazard of private dental clinics compared with dental department of general hospitals.
2. Direct exposure the operators' fingers: Unfavourable practice were observed of holding a dental film in the mouth of a pati ent by the fingertips of the operator at the time of an exposure. They feel it an urgent responsibility of dental and medical authorities to warn against it, and to invent any tool that can replace such as dangerous practice.
3. Unuseful radiation control:
There emerged necessity of encouraging the personal dosage monitoring for operators and to use protective apron on the patients.
4. Over dose control:
The justification of exposure field dimensions and that standardization of dental film processing methods would be brought about 30 % decreasing of the exposure for intraoral radiography.抄録全体を表示PDF形式でダウンロード (989K) -
島野 達也, 加藤 朗, 中島 敏行, 古本 啓一, 鈴木 陽典, 松本 健, 崎原 克彦, 加藤 二久, 大坊 元二, 河用 昌晴, 西岡 ...1980 年 20 巻 1 号 p. 21-35
発行日: 1980年
公開日: 2010/10/21
ジャーナル フリーThis study is the matters for measurements of distributions of scattered X-rays in dental roentgenography. The measurements set out in two items.
1. The measurements of angular distribution of the scattered X-ray dose for six regions in intraoral roentgenography using 10 sheets of film and the estimation of effective ene rgy of the scattered X-rays.
In this experiment, the scattered material was Randophantom, and methods of proje ction and technical data in roentgenography were obtained from some domestic literatures and the results of actual investigation of dental X-ray examination in 1976.
Dose distributions of the scattered X-rays for six regions in intraoral roentgenography, at the height of +40, 0 and-40cm from the occlusal plane of the Randophantom and the distance of 50, 100 and 150cm from the center axis of the Randophantom were measured by using TLDs which were set at positions of about 60.
The tandem TLD system, which consisted of Mg2SiO4: Tb and LiF, was used for measurements of the dose and estimations of effective energy of the scattered X-rays. TLDs were calibrated by the standard gamma-ray irradiation.
The scattered radiation dose was presented as μR per 1R at the end of cone. As an example, doses at 150cm from the center axis of phantom were from 47 to 110. 8μR. The effective energy was from about 27 to 30keV. This shows that the effective energy of the scattered X-rays have a tendency to be higher than primary X-ray.
2. Changes of angular distribution of the scattered X-ray dose due to the difference of the scattered materials.
Three Randophantoms which were one man-phantom and two woman-phantoms, were used in this experiment. Survey meter Aloka ICS-151 was used for measurements. The dose of the scattered X-rays for man-phantom was about 1.2 times as much as that for woman-phantom.抄録全体を表示PDF形式でダウンロード (1712K) -
第1報: エナメル質形成不全122症例の集計観察内海 潔, 諸井 英二, 古跡 孝和, 清水谷 公成, 安達 泉, 江原 昌弘, 古跡 養之真, 山田 直之1980 年 20 巻 1 号 p. 36-43
発行日: 1980年
公開日: 2010/10/21
ジャーナル フリーAn analysis was made about the roentgenographic findings of 122 cases with enamel hypoplasia from 400, 000 routine dental roentogenograms at Department of Oral Radiology, Osaka Dental Hospital.
The results were obtained as follows:
1. The mean age was 11.9 years.
2. The affected sex-ratio did not reveal apparent differences.
3. The affected percentage of enamel hypoplasia was 1.1 % of patients under 20 years old age.
4. The incisors, cuspids and first molars were involved most frequently.
5. Seven cases in four families revealed hereditary amelogenesis imperfecta and three cases in a family were described.6. First molars were a relatively common in some of which were performed restorative preparations for enamel hypoplasia.
7. Enamel hypoplasia among 101 cases have almost occurred during two years after birth.
8. The etiology of enamel hypoplasia is possibly caused by nutritional, vitamin deficiencies and infectious fever.抄録全体を表示PDF形式でダウンロード (2243K) -
楊 栄展, 大庭 健1980 年 20 巻 1 号 p. 44-51
発行日: 1980年
公開日: 2010/10/21
ジャーナル フリーEllis-van Creveld syndrome was first reported by Ellis and van Creveld in 1940. Since 1940, sixteen cases of this syndrome have been reported in Japan.
The characteristic clinical and roentgenological findings of this syndrome are chondrodysplasia, ectodermal defect involving teeth, jaws, and nails, polydactyly, and congenital heart disease.
Although the Ellis-van Creveld syndrome shows oral manifestations of oligodontia, malformed teeth, and serrated alveolar ridge, this syndrome has not reported in Japanese dental literatures.
In this paper, a 9-year-old Japanese boy diagnosed as the Ellis-van Creveld syndrome is reported. This paper will be a first case report of the Ellis-van Creveld syndrome reported in Japanese dentistry.抄録全体を表示PDF形式でダウンロード (4486K) -
池島 厚, 尾澤 光久, 山本 浩嗣1980 年 20 巻 1 号 p. 52-60
発行日: 1980年
公開日: 2010/10/21
ジャーナル フリーAn adenomatoid odontogenic tumor, which has been recognized as one that is histologically different from an ameloblastoma, is an epithelial odontogenic tumor of the jaws.
Its characteristic features are that it mostly relates to unerupted teeth and is a sort of which includes enough scattering calcification to produce a radiopacity in radiograph, but it does not accompany any local infiltration as an ameloblastoma.
This tumor is often discovered in the course of the routine radiographic examination to find the causes of unerupted teeth and swelling jaws.
The present paper deals with three adenomatoid odontogenic tumor cases.抄録全体を表示PDF形式でダウンロード (2437K) -
池島 厚, 尾澤 光久, 山本 浩嗣1980 年 20 巻 1 号 p. 61-75
発行日: 1980年
公開日: 2010/10/21
ジャーナル フリーA simple bone cyst, which was first reported by Lucas in 1929, has been known in different names such as traumatic bone cyst, solitary bone cyst, hemorrhagic bone cyst, progressive bone cavity, unicameral cyst, extravasation cyst, idiopathic bone cyst, solitary bone cavity and so on, and its calling name has not academically established yet.
Generally speaking, it is said that the most of the simple bone cysts have no symptom and are usually discovered accidentally through the routine radiographic examinations. It is also radiographically said that this cystic lesion generally appears as a radiolucency which is surrounded with a weak white line, and in case of a large cyst recognized just under the teeth, it usually looks like a scalloped shape. It is a non-odontogenic lesion, the wall of which is covered with thin fibrous connective tissues histopathologically containing more or less fluid in it.
From these characteristics, it is important to discriminate between the simple bone cyst and other lesions. Particularly as to the discrimination between the simple bone cyst and benign tumors or any other cystic lesions it is recommendable to make a diagnosis of the simple bone cyst through careful observation of a patient's medical history and symptoms, and radiographic and histopathological examinations. The simple bone cysts found radiographically just under the teeth have been often reported, but these in the mandiblar ramus have been seldom or never reported.
We herein report the cases accidentally found two cases of the simple bone cyst in the mandiblar ramus through the routine radiographic examinations of the patients who visited our hospital to receive the treatment for some dental diseases.抄録全体を表示PDF形式でダウンロード (3646K) -
野井倉 武憲, 堂原 義美1980 年 20 巻 1 号 p. 76-77
発行日: 1980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 (793K) -
1980 年 20 巻 1 号 p. 78-90
発行日: 1980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 (2003K) -
1980 年 20 巻 1 号 p. 91-95
発行日: 1980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 (615K)
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