Matsumoto Dental University Repository
Not a member yet
2206 research outputs found
Sort by
歯科用デジタルエックス線撮影における背景の写りこみによるエラー像 : イメージングプレート取り扱い上の注意事項
Get PDFapplication/pdfDigitization of x-ray imaging has progressed remarkably in the dental field. Particularly, the advantages of digital imaging include convenient procedures such as prompt image viewing after scanning, easy deletion of unwanted images, and the absence of developer, fixer, and complicated film developing processes. In this study, we defined the cause of artifacts on the intra-oral imaging plate (IP) due to incorrect handling of the IP based on such conditions as ink type, color of letters, sheet type, and presence of laminating. Our results showed that artifacts appear on the IP when the active surface of the IP directly contacts the ink or letters with photoactivity. Dentists can use IP, the digital x-ray system, more casually than photo film and the benefits of convenience are always a positive issue, but carelessness may result in the appearance of artifacts. It is therefore suggested that dentists should not remove the protective cover immediately before scanning and should avoid ambient light in the use of IP.journal articl
上顎右側過剰歯と第三大臼歯の融合歯の1例
Get PDFapplication/pdfDental abnormalities include an unusual number of teeth, configuration, unusual size of the tooth, malformation of the dental hard tissues, and abnormal eruption and position. In fusion, several tooth germs have been fused during odontogenesis. This occurs commonly in the anterior tooth region but rarely in the molar region. Especially, the incidence of fusion involving supernumerary teeth in the maxilla and third molar is extremely low. In this case report, we present a cone-beam CT image of a 41-year-old woman with fusion involving supernumerary teeth in the maxilla and third molar and reviewed the literature on type of this lesion.journal articl
SQUAMOUS ODONTOGENIC TUMOR OF THE MANDIBLE: A CASE REPORT DEMONSTRATING IMMUNOEXPRESSION OF NOTCH1, 3, 4, JAGGED1 AND DELTA1
Get PDFapplication/pdfBackground:Squamous odontogenic tumor (SOT) is a rare benign odontogenic epithelial neoplasm. A slow-growing painless expansive swelling is the common presenting symptom. Histopathologically, SOT can be easily misdiagnosed as an acanthomatous ameloblastoma. Although Notch receptors and ligands have been shown to play a role in cell fate decisions in ameloblastomas, the role of these cell signaling molecules in SOT is unknown. Case report:This paper describes a case of SOT affecting the anterior mandible of a 10-year-old Indian female. The patient was treated by local surgical excision and there has been no follow-up clinical record of recurrence 5 years after primary treatment. Histopathological examination revealed a solid, locally-infiltrative neoplasm composed of bland-looking squamatoid islands scattered in a mature fibrous connective tissue stroma and the diagnosis was SOT. Immunohistochemical evaluation showed positive reactivity of varying intensity in the neoplastic epithelial cells for Notch1, Notch3, Notch4, and their ligands Jagged1 and Delta1. Expression patterns showed considerable overlap. No immunoreactivity was detected for Notch2 and Jagged2. Conclusions:Present findings suggest that Notch receptors and their ligands play differential roles in the cytodifferentiation of SOT.journal articl
頸部回旋角度の変化が嚥下時の食塊通過へ及ぼす影響
Get PDFapplication/pdf【目的】頸部回旋法は、頭を麻痺側に回旋して嚥下することで、嚥下後の咽頭残留を軽減させる摂食・嚥下代償法のひとつである。しかし、頸部を回旋した状態で長い時間食事をとるという姿勢は、身体へ負担がかかる可能性がある。そのため、頸部回旋の有効性を残したままで、できる限り摂食しやすい姿勢が望まれる。今回われわれは、若年健常者において、どの程度の頸部回旋角度から咽頭嚥下時の食物通過側に変化があるか検討した。【対象と方法】摂食・嚥下障害のない健常若年成人30名(平均26歳)を対象とした。被験者がバリウムを嚥下するときの頸部回旋角度を、正面位と左右各15度、30度、45度および最大回旋位の合計9角度に設定した。被験者が3mlの液体バリウムを嚥下するところをVF正面像にて撮影、記録した。デジタル化されたVF映像上で、下咽頭での回旋側のバリウム通過の有無を同定した。各頸部回旋角度で、回旋側下咽頭をバリウムが通過した人の割合を比較検討した。【結果】正面位では、全例で両側をバリウムが通過していたが、頸部回旋角度が増すと、回旋側通過の割合が減少した。30度頸部回旋でのバリウムの回旋側下咽頭通過の割合は、右側回旋23%(7名/30名)、左側回旋40%(12名/30名)と有意な減少を認めた(p<0.01)。最大まで頸部を回旋すると、右側回旋1名、左側回旋4名のみで、バリウムが回旋側を通過していた。【結論】今回の検討より、頸部回旋が30度以上になると、バリウムが回旋側下咽頭を通過した人の割合が有意に減少することが明らかになった。摂食・嚥下障害者への姿勢代償法は、必要十分な安全性をもち、かつできるだけ楽な摂食姿勢が望ましい。頸部回旋法の有用性は、通常VFや経鼻内視鏡を用いて決定される。今回の検討より、頸部回旋の有用性を確認するときには、30度程度の回旋からその有効性を確かめてみる価値があることが示唆された。journal articl
導管嚢胞を伴った耳下腺組織におけるアクアポリンの局在
Get PDFapplication/pdfThe expression and localization of water channels, aquaporin (AQP)3 and AQP5, in human parotid duct cyst were examined by immunohistochemistry. In acinar cells surrounding striated ducts, AQP3 is very abundant at the basal and lateral surfaces, while AQP5 is strongly labeled in the apical membrane and in the intercellular canaliculi. However, weak labeling and no labeling of AQP3 and AQP5 were observed in some acinar cells at the secretory end pieces. These findings suggest that potential disorder of acinar cell occurs in salivary duct cyst, and may be responsible for the pathogenic mechanisms of salivary duct cyst.journal articl