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本文比较了用浸酸溶液,50μm氧化铝和50μm玻璃小珠清洁处理以后,磷酸锌粘固的Ⅲ型铸造金合金全冠的固位情况. 材料和方法制备30个拔除的完整的人牙,清洗、消毒,然后将每个牙根包埋在环氧树脂底座中,用Ney观测仪定出牙长轴,并使其与环氧树脂底座成90°角,这些牙齿按金属全冠预备,轴面高度为4mm,锥度为6°角,(牙合)面为平面。取模,制成代型,均匀地涂布一层隙料。用浸蜡技术完成蜡型帽状冠,并在每一个蜡型帽状冠的(牙合)面加一个V型杆,然后包埋。30个包埋的蜡型用
In this paper, we compared the retention of type Ⅲ cast gold crown with zinc phosphate after clean treatment with pickling solution, 50μm alumina and 50μm glass beads.Materials and Methods Thirty intact human teeth were prepared, After washing, disinfecting, and then embedding each tooth root in an epoxy base, the long axis of the tooth is determined using a Ney Observer and set at a 90 ° angle to the epoxy base. The teeth are prepared with a metal crown Face height of 4mm, taper 6 ° angle, (occlusal) plane is flat. Take the mold, made of substituting, evenly coating a layer of gap material. Waxed cap crowns were prepared using a dip wax technique and a V-shaped rod was added to the occlusal surface of each waxed crown and then embedded. 30 embedded wax type