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Observation of Unerupted Teeth Using Cone Beaming X-ray CT Imaging
Get PDFapplication/pdf顎骨内に存在する未萌出歯の観察は,歯科用エックス線写真による二次元的な画像であるために,像の拡大や歪みなど精度の低下が疑問視され,撮影部位によっては解剖学的形態から読影が困難である場合が多い。しかし,CTやMRIによる撮影は被曝線量や解像力の問題が指摘され,歯科臨床に応用されることが少ない。本研究では,被曝線量が少なく,硬組織の画像が鮮鋭であり,装置が小型である歯科用小照射野エックス線CTを使用し,解剖学形態により読影が困難とされる上顎の未萌出歯の観察を行った。その結果以下の結論を得た。1.歯列に対して平行する面では,第二大臼歯は遠心方向に回転していた。2.咬合平面に対して平行する面では,第二大臼歯は第一大臼歯に対して頬側方向に位置していた。3.歯の萌出方向に隣接した歯槽骨の一部が存在しないことが確認できた。また,歯槽骨が離開している部分は,第二大臼歯の歯冠幅径に比べて小さい値を示した。4.歯列に対して横断する面では,第二大臼歯歯冠の根尖は硬口蓋よりも頭蓋側に位置していた。5.3DXの撮影画像では,硬組織や未萌出歯の位置関係が鮮鋭に観察できた。journal articl
パルス型Nd:YAGレーザの加工したレーザチップを歯肉メラニン沈着除去に応用した1症例
Get PDFapplication/pdfThis case report presents the application of a pulse rate Nd : YAG laser-enhanced fiber tip in the removal of gingival melanin hyperpigmentation. A 49-year-old male complained of an esthetic problem followed periodontal treatment. The patient desired improvement of the gingival color by laser treatment. The Nd: YAG laser irradiation was performed with an enhanced fiber tip which was activated by Fiber Tip Enhanced Devices (SLT Japan Co. Id., YAMANASHI, JAPAN) at 400 mj, 10 pulse/sec for a total of 124 sec, with an air spray in a non-contact mode without local anesthesia. The visual scale (VAS) was used to evaluate the pain level experienced by the patient. The wound healing was evaluated at 1 week, and 1, 3 and 6 months, after irradiation. The patient perceived slight pain until 6 months after treatment. At 1 week, the gingiva had recovered to an almost normal appearance,; at 1 month, the gingiva showed hearling delay, but complications and side effects were not observed during this observation period. Slight recurrence of the melanin pigmentation was observed after 6 months. The results of the present clinical study suggest that the removal of gingival melanin pigmentation can be performed safety and effectively by pulsed Nd: YAG laser irradiation with an enhanced fiber tip.journal articl
最新の痛み分子基盤 : Capsaicin受容体を中心に
Get PDFapplication/pdfPain is associated with complicated psychological effects. Elusion and overcoming pain is a big challenge in Medicine. In recent years, pain research has greatly advanced, because, the structure and function of neurotransmitters and their receptors have been analyzed by molecular biology techniques. The cloning of the capsaicin receptor especially is a current topic for pain researchers (Julius et al. 1997). In this review, I collect findings on the molecular basis of pain, capsaicin, transient receptor potential super family, and trigeminal pain pathway.journal articl
