歯科放射線
Online ISSN : 2185-6311
Print ISSN : 0389-9705
ISSN-L : 0389-9705
36 巻, 3 号
選択された号の論文の8件中1~8を表示しています
  • 神田 重信
    1996 年 36 巻 3 号 p. 135-136
    発行日: 1996/09/30
    公開日: 2011/09/05
    ジャーナル フリー
  • 仙波 伊知郎
    1996 年 36 巻 3 号 p. 137-152
    発行日: 1996/09/30
    公開日: 2011/09/05
    ジャーナル フリー
    The revised second edition of “WHO Histological Typing of Odontogenic Tumours” was published in 1992, which attempts to update the first classification in the light of current progress in diagnosis and the relevance of tumor types to clinical and epidemiological features. The classification is of importance to standardize the criteria for scientific research and to facilitate collaboration among clinicians, pathologists and radiologists in the diagnosis. However, some exclusions of relevant lesions and their detailed descriptions made in the revision may cause confusion in differential diagnosis. This review refere to the major differences between the first and second edition of the WHO classification. Several revised lesions in the second edition were discussed with respect to their differential diagnosis. The major changes includea new group of benign odontogenic tumors, the addition of several new categories in odontogenic tumors and cysts, and the rearrangement of categories of cementum-forming lesions. The classification of tumors based on the molecular basis of developmental stage and / or the differentiation step of odontogenic tissues rather than histomorphological features alone may more precisely reflect the biological and clinical behaviors of the tumors. However, our knowledge in this area is limited. Differential diagnosis may still be problematic and requires experience that the low occurrence rate of odontogenic tumors is not likely to provide. A recently developed database on a computer network may be a powerful educational tool with respect to both scientific research and diagnostic practice.
  • 本田 和也, 橋本 光二, 島田 英治, 上野 正博, 澤田 久仁彦, 川嶋 祥史, 荒木 正夫, 岩井 一男, 篠田 宏司
    1996 年 36 巻 3 号 p. 153-160
    発行日: 1996/09/30
    公開日: 2011/09/05
    ジャーナル フリー
    The purpose of this study was to investigate the morphological changes on the mandibular fossa and articular eminence in case of TMJ articular disc perforation. The materials were the TMJs from 32 Japanese cadavers', including 7 perforated cases and 25 non-perforated cases. Morphological analysis was perfomed by macroscopic observation and the TMJ tomography. In addition, the morphology of the mandibular fossa was measured using the serial TMJ lateral tomographs. Morphological measurement of the mandibular fossa revealed significantly smaller values in the horizontal diameter, vertical diameter and front length in the of TMJ cases articular disc perfornation compared with the non-perforated cases by Student's t-test (P<0.01). Additionally, the larger the size of the perforation, the smaller the measurment values of the TMJ. In conclusion, these results suggest that the perforation of the TMJ articular disc leads to degenerative changes in the mandibular fossa and articular eminence.
  • 松田 幸子, 塩野 目学, 長谷川 紘司, 岡野 友宏
    1996 年 36 巻 3 号 p. 161-166
    発行日: 1996/09/30
    公開日: 2011/09/05
    ジャーナル フリー
    The diagnostic accuracy of multimodal tomography (Scanora®: SCA) was compared with that of digital radiography (Digora®: DIG) for periodontal intrabony defect and bifurcation involvement. Five dry mandibular jaw specimens were used. Eight proximal molar sites and eight furcation sites were selected in this study. Simulated lesions were created at the interproximal intrabony and the inter-radicular regions by removal of bone with the use of round burs that measured 0.8mm in diameter. Six interproximal and six bifurcation lesion stages were created with depths of 2mm and widths of 0mm, 1mm, 2mm and 3mm measured with a periodontal probe. Tangential tomograms were taken with a Scanora®. Periapical radiographs were obtained by the paralleling technique (60kV, 40cm FSD). Exposure was adjusted to speed-E periapical film. These images, randomized in sequence, were assessed by six observers. In Digora®, the contrast and brightness fitness could be adjusted by the observer. The effectiveness of each technique in detecting lesions and identifying normal cases was measured by calculating the percentages of lesions detected (sensitivity) and the percentages of normal cases identified (specificity). Mean sensitivity/specificity for the intrabony area were 0.76/0.88 (SCA), 0.82/0.90 (DIG), and for the bifurcation area were 0.45/0.84 (SCA), 0.31/0.74 (DIG). According to the results, the Scanora® had better performance in detecting bifurcation defects than the Digora®. These results suggest that: (1) multimodal tomography is as good as intraoral radiograpy in the diagnosis of intrabony defects; and (2) in detecitng bifurcation defects, multimodal tomography is more useful than intraoral radiography.
  • 加藤 徳紀, 林 孝文, 中山 均, 中島 俊一, 伊藤 寿介, 棟方 隆一, 中村 太保
    1996 年 36 巻 3 号 p. 167-175
    発行日: 1996/09/30
    公開日: 2011/09/05
    ジャーナル フリー
    This report describes the correlation between sonographic (10MHz high-resolution) and pathologic findings of metastatic cervical lymph nodes in patients with oral squamous cell carcinoma. Pathological findings of primary lesions obtained by biopsy before any treatments were initiated were also correlated with those of metastatic lymph nodes. The study cohort consisted of 25 patients with oral squamous cell carcinoma admitted to our institution from April 1991 through July 1995, and 58 metastatic cervical lymph nodes obtained by neck dissection. The results were as follows. 1) A hyperechoic area seen on metastatic lymph nodes was derived from high keratinization. 2) The degree of keratinization of primary lesions was similar to that of metastatic lymph nodes. 3) Metastatic lymph nodes obtained in patients in whom primary lesions showed minimal or no keratinization had tendency to show hypoechoic or anechoic densities. 4) Metastatic lymph nodes obtained in patients in whom primary lesions showed high or moderate keratinization disclosed hyperechoic or heterogeneous densities. Our results suggest that the degree of keratinization of primary lesions might predict sonographic findings of metastatic cervical lymph nodes.
  • 内田 啓一, 馬瀬 直通, 深澤 常克, 和田 ゆかり, 長内 剛, 和田 卓郎
    1996 年 36 巻 3 号 p. 176-181
    発行日: 1996/09/30
    公開日: 2011/09/05
    ジャーナル フリー
    The hyoid bone is a bone not directly connected with other bones. Rather it is surrounded by soft tissues, mandible and vertebra. These act a protector to the traumatic injury. We herein report two cases of hyoid bone fracture. A 29- year- old man was tackled during a football game. After the game, he experienced continous pain for a week while swallowing. A plain radiograph did not reveal the cause of his pain at the first examination, but CT images taken more than a week later revealed a hyoid bone injury. The 3D image shows the dislocation of a fragment of the bone. A 46- year- old man had injured his mandible in a traffic accident and thereafter experienced severe pain in his jaw and was unable to open his mouth. The fracture of his mandibular body and ramus was found by radiography. The repositioning operation of the mandibule was considered successful, but the hyoid bone fracture was not discovered at that time. After the operation, the patient complained of gradual pain upon swallowing, and a subsequent radiographic examination showed that the hyoid bone had been fractured. In both cases, it was confirmed that ordinary lateral oblique radiography should be technically modified to some extent, and CT or other images might be necessary for the detection or diagnosis of hyoid bone fracture.
  • 今中 正浩, 小林 馨, 柏原 広美, 森戸 光彦, 山本 昭
    1996 年 36 巻 3 号 p. 182-183
    発行日: 1996/09/30
    公開日: 2011/09/05
    ジャーナル フリー
  • 1996 年 36 巻 3 号 p. 184-188
    発行日: 1996/09/30
    公開日: 2011/09/05
    ジャーナル フリー
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