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A student evalution of physical education at Matsumoto Dental University
No full textPdepartmental bulletin pape
Uber die Wurdigung der antiken bildenden Kunst : Breif eines reisenden Danen, Der Antikensaal zu Mannheim"(1785) von Freidrich Schiller
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The Relationship Between the Eruption Status of the Mandibular Third Molars and the Mandibular Morphology in Japanese
Get PDFapplication/pdf下顎第三大臼歯の萌出に関する下顎骨の形態を明確にすることを目的に,男性,女性ともに第三大臼歯を萌出別に3群に分類し検討を行った。1.男性の距離的計測項目では,完全萌出(C群)の下顎骨全長(M),Cd-Gn ,U6-PTV,L6-MP'は完全埋伏(A群)に比べ大きい値を示し,有意差が認められ,角度的計測項目では完全萌出(C群)のFacialAngle,OP-MPは完全埋伏(A群)に比べ大きい値を示し,有意差が認められた。2.女性の距離的計測項目では,完全萌出(C群)の下顎骨全長(M),Cd-Gn,U6-PTV,L6-MP'は男性と同様に完全埋伏(A群)のそれより大きい値を示し,有意差が認められた。その他,完全萌出(C群)の下顎体長(C),下顎枝の幅(R),Go-Me,Xi-PM,Xi-L7,ABR-L7,U7-PPの値はいずれも大きく有意差が認められた。角度的計測項目では完全萌出(C群)のY-axisは小さく,SNAが完全埋伏(A群)より大きく,有意差が認められた。3.男性,女性ともに第三大臼歯が萌出している症例は,下顎骨自体が大きく,埋伏している症例に比べ,下顎第三大臼歯が萌出するために必要な後方の萌出容量が確保されていた。また,下顎第一大臼歯は,第三大臼歯の萌出により挺出傾向を示した。journal articl
Application of Er: YAG Laser Irradiation to Immature Teeth
Get PDFapplication/pdfTo evaluate the usefulness and safety of Er: YAG laser for cavity preparation of immature teeth, we irradiated the tooth substance using Er: YAG laser in teeth of rats in the growth stage and human immature premolars showing an incomplete root and determined appropriate irradiation conditions, observed the irradiated surface by scanning electron microscopy (SEM), evaluated the thermal effects of irradiation, and performed histopathological examination. SEM of the irradiated surface revealed no smear layer or dentinal plug observed after cavity preparation using an air turbine, and the dentinal tubules were open. Neither carbonization nor cracks were observed after irradiation at 50, 100, or 150mJ/pulse. Evaluation of thermal effects showed a mean temperature of less than 5℃ in the dentin on the pulp side after irradiation by each combination of the following conditions: dentin thickness, 1.0 or 1.5mm irradiation time, 2, 5, or 10 seconds; and energy, 50, 100, or 150mJ/pulse. Histopathological examination showed circulatory impairment and disarrangement of odontoblasts immediately after irradiation but tendency to recovery after 1 week. These results suggest the applicability of YAG laser to irradiation of the tooth substance. Considering the effects on the pulp, irradiation at 50-100mJ/pulse may be useful and safe for irradiation of the tooth substance of immature teeth.journal articl
