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40 巻, 1 号
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野井倉 武憲2000 年 40 巻 1 号 p. 1-15
発行日: 2000/03/31
公開日: 2011/09/05
ジャーナル フリーMany developmental disturbances affect oral structure. Generalized disturbances are those wherein the oral changes are related to disturbances in other parts of the body. Not all of these disturbances produce variations in teeth and/or bone. Alterations of teeth are caused by many local or generalized developmental disturbances. Some dental defects are inheritable disorders associated with systemic diseases. These defects may result in radiographic manifestations, and interpretation of radiograms are available on the recognition and differentiation of anomalies of teeth. The anomalies of teeth have been categorized conventionally to include defects in number, morphology, and hard tissue structure and tooth position.抄録全体を表示PDF形式でダウンロード (19487K) -
第1報56症例の歯科用小照射野X線CT(Ortho-CT)像の観荒木 正夫, 新井 嘉則, 橋本 光二, 篠田 宏司, 小宮山 一雄2000 年 40 巻 1 号 p. 16-25
発行日: 2000/03/31
公開日: 2011/09/05
ジャーナル フリーAccording to the WHO classification in 1992, fibro-osseous lesions (FOL) of jaw bones were divided into osteogenic neoplasms and non-neoplastic lesions. However, it is difficult to differentiate cemento-osseous dysplasia, diffuse sclerosing osteomyelitis and condensing osteitis occurring in the periapical region, which show mixed radiolucent and radiopaque appearances, because the radiographic features of these lesions are very similar. Therefore, we investigated the findings of the internal condition of the lesions with limited cone beam X-ray CT for dental use (Ortho-CT) developed by Arai et al. in contrast to rotational panoramic radiography (RPR). A total of fifty-six lesions were analyzed using the rotational panoramic images and classified into the following three types. Type 1 had an amorphous appearance that showed uniform density, type 2 had a mottled appearance that showed mixed radiopacity and radiolucency, and type 3 had a complex appearance that showed complex internal condition. These lesions were also classified using Ortho-CT images according to the above criteria. Thirty-six (64.3%) of 56 cases were classified the same using either RPR or Ortho-CT image analysis. Many FOL of the jaw bones were not removed, except for neoplasms, so we obtained little information about the pathological findings of these lesions. However, in our study, the Ortho-CT images showed that FOL in the edentulous region included inflammatory lesions and a reactive bone formation. We conclude that Ortho-CT images are useful for diagnosing the internal condition of FOL and observing in minute detail by means of multi-directional images to provide new information of these lesions.抄録全体を表示PDF形式でダウンロード (11629K) -
佐藤 太吾, 玉澤 賢, 代居 敬, 酒井 康雄, 鈴木 雅之, 荒井 千明, 稲垣 宏之2000 年 40 巻 1 号 p. 26-32
発行日: 2000/03/31
公開日: 2011/09/05
ジャーナル フリーWe have been investigating the changes of lymphocyte subsets in the immune organs after head and neck irradiation. The present study investigated the influence due to local irradiation (lOGy) of a portion of the maxilla on intestinal intraepithelial lymphocytes (i-TEL) in mice. We analyzed the percentage of subpopulations in i-TEL following irradiation using two-color fluorometry (anti-TCR α β, TCR γ δ, CD4 and CD8 monoclonal antibodies), and the outcome was compared with that obtained from non-irradiation groups. The result was that the percentage of α β T cells, γ δ; T cells, CD4+SPT cells and CD8+SPT cells did not show any significant change and the fact differed from that in spleen and thymus where the percentage of these subpopulations was significantly changed. Although spleen and thymus reflect damaged lymphocytes that had circulated through the irradiation field, the result indicates that the balance among i-TEL subsets does not change after irradiation. The reason that equilibrium of the i-TEL subsets remains stable seems related to localization of the small intestine and radioresistance. It was also indicated that the effect on the oral epithelium in the irradiation field reflects the percentages of i-TEL subsets.抄録全体を表示PDF形式でダウンロード (891K) -
林 孝文, 伊藤 寿介, 平 周三, 勝良 剛詞, 檜木 あゆみ, 河野 正己2000 年 40 巻 1 号 p. 33-37
発行日: 2000/03/31
公開日: 2011/09/05
ジャーナル フリーThe purpose of this study was to investigate the age distribution of the minimal diameter of non-metastatic jugulodigastric lymph nodes seen on ultrasonography to establish a reliable criterion to differentiate metastatic from non-metastatic lymph nodes. Between October 1998 and November 1999, 386 patients with obstructive sleep apnea syndrome were examined using neck ultrasonography to evaluate atherosclerosis of the common carotid artery and the minimal diameter of jugulodigastric lymph nodes were measured simultaneously. The study cohort consisted of 100 Japanese males extracted at random ranging in age from 31 years to 79 years (average: 54.3 years). Patients with any oral malignancies were excluded. The minimal diameter of the node was 8.8 mm on average in patients in the fourth decade, 8.1 mm in the fifth decade, 7.2 mm in the sixth decade, 7.0 mm in the seventh decade, 7.0 mm in the eighth decade, respectively. A significant difference was observed between the fourth decade and the sixth decade or older using post hoc test (p<0.05): If the cut-off point of the minimal diameter should be 8 mm, the specificity was 45% in patients in the fourth decade, 70% in the fifth decade, 85% in the sixth decade, 85% in the seventh decade, 85% in the eighth decade, respectively. In conclusion, the minimal diameter of 8 or 9 mm in the jugulodigastric lymph nodes, which is the currently accepted criterion for metastatic lymph nodes on ultrasonography, might be almost adequate as the cut-off point. Additionally, we recommend that the cut-off point should be lmm larger in patients in the fourth decade than in patients in the sixth decade or older.抄録全体を表示PDF形式でダウンロード (648K) -
CT像からみた波及経路の検討木村 幸紀, 佐野 司, 岡野 友宏2000 年 40 巻 1 号 p. 38-46
発行日: 2000/03/31
公開日: 2011/09/05
ジャーナル フリーOdontogenic infections occasionally lead to suppuration in spaces that are not adjacent to the mandible. Some of these infections become in difficulty to control and develope into deep neck infections by gravitating in the neck, which can possibly lead to life threatening situations such as mediastinitis. The carotid sheath (carotid space) is thought to be one of the important routes for suppuration in the parapharyngeal space and spreading down to the mediastinum. In this article, we report two patients with a dental abscess that was complicated with carotid sheath infections, and the pathways for the spread of these infections from the mandible to the carotid space were analyzed retrospectively on CT images. In one case, it was a common route via the parapharyngeal space involving the carotid sheath. However, in the other, it was an unusual route, from the submandibular space to the carotid sheath along a branch of the jugular vein. In conclusion, the parapharyngeal space is the common anatomic pathway to the carotid sheath, but the submandibular space in which the branch of the jugular vein that runs into the carotid sheath is not common and should be recognized.抄録全体を表示PDF形式でダウンロード (12545K) -
病変と下顎管との関係に対して橋本 光二, 寺門 正昭, 新井 嘉則, 上原 任, 本田 雅彦, 関和 忠信, 篠田 宏司2000 年 40 巻 1 号 p. 47-57
発行日: 2000/03/31
公開日: 2011/09/05
ジャーナル フリーLimited cone beam X-ray CT for dental use (Ortho-CT) developed by Arai et al, has been applied clinically since 1997 at the Radiology Department of Nihon University Dental Hospital, and over 1900 cases have been imaged. The principle and theory of this system has been reported. Three-dimensional high quality images of any tomographic plane can be obtained in one exposure. Furthermore, patient doses are almost similar to those of rotational panoramic radiography and 1/30 of conventional X-ray CT. The exposure field is an orthocubic figure with a height and diameter of 30mm and 38mm, respectively. This system is more effective for diagnosinig a cyst, impacted tooth and inflammation oriented from an apical lesion than for malignant tumors extensively invading the oral and maxillofacial region. The purpose of this study was to clarify the usefulness of Ortho-CT for diagnosing lesions that occur in the mandible by comparing three-dimensional images of this system and the information from oral surgery. From the detailed results, information of the location, figure, extension of the lesion and the relationship with the mandibular canal and adjacent teeth were obtained by the Ortho-CT images. We conclude that Ortho-CT imges are useful for diagnosing lesions of the mandible, especially for the relationship between the lesion and the mandibular canal.抄録全体を表示PDF形式でダウンロード (18795K) -
放射線防護委員会報告佐々木 武仁, 加藤 二久, 岩井 一男, 岡野 友宏, 佐藤 健児, 島野 達也, 速水 昭宗, 和田 真一, 寿藤 紀道2000 年 40 巻 1 号 p. 58-69
発行日: 2000/03/31
公開日: 2011/09/05
ジャーナル フリーObjectives: To test the reliability and reproducibility of the measurements using glass dosimeter on both of the dose and the quality of X-ray used in intraoral radiography. Methods: Based on our preliminary experiment performed by the Radiation Protection Committee, Japanese Society for Oral and Maxillofacial Radiology, doses in air kerma and effective energies of X-ray measured by glass dosimeter (Toshiba Glass Corp) were compared with those measured by an ionization chamber calibrated to the national standard. Twenty-six of 29 departments of dental radiology joined in this study in Japan.
Results: The linear regression analysis of 20 paired data between doses in air kerma in air measured using glass dosimeter and doses obtained from measurements using an ionization chamber indicated a highly significant correlation. The result was highly reproducible compared to that obtained from our preliminary experiment. The back scatter factor estimated from the half value layer and the radius of radiation field was narrowly distributed, and the mean with the standard deviation was 1.269±0.003. It was estimated from the present measurements that the guidance level expressed as air kerma at the skin surface was about 7 mGy for the radiography of the maxillary molar region in the dental radiology department of Japanese dental school hospitals. Although the correlation between effective energies obtained from the measurement using a glass dosimeter and those obtained from half value layers using an ionization chamber was statistically significant, the correlation coefficient was not high enough to detect a change of X-ray quality in intraoral radiography.
Conclusion : The glass dosimeter method is highly reliable for measuring X-ray doses of air kerma in air but not for detecting a change of X-ray quality in intraoral radiography.抄録全体を表示PDF形式でダウンロード (1454K) -
2000 年 40 巻 1 号 p. 70-85
発行日: 2000/03/31
公開日: 2011/09/05
ジャーナル フリーPDF形式でダウンロード (2934K)
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