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我科采用内扩式无缝冠成形技术,应用于临床122例效果满意。一、制冠原理:以特制的硬质低熔合金(铋44.6％、锡44.2％、锑11.2％,其熔点135℃～200℃,布氏硬度36～40),制成金属阴模为主体,选适当的半成品冠套置入阴模内,同时在冠套内加入填料(尼龙鱼线直径1mm,剪成1～2mm长的颗粒,能反复使用多次,或用类似材料均可)作为传递力量介质。将选出的冲头插在油压机上,向冠内施加强大的压力,迫使冠套受力变形膨胀扩大,直到冠套与阴模内壁接触,达到所需形态。二、制作程序:①基牙预备、取模、灌注石膏一般常规方法。②蜡恢复邻接点修剪代型:修剪石膏模
Our department uses the seamless expansion crown forming technology, applied to clinical satisfactory results of 122 cases. First, the crown principle: a special hard low-alloy (44.6% bismuth, 44.2% tin, 11.2% antimony, the melting point of 135 ° C ~ 200 ° C, Brinell hardness 36 ~ 40), made of metal as the main mold , Select the appropriate semi-finished crown set into the female mold, while adding filler in the crown set (nylon fish line diameter 1mm, cut into 1 ~ 2mm long particles can be used repeatedly, or similar materials can be) Power transmission medium. The selected punch inserted in the hydraulic press to exert a strong pressure on the crown to force the deformation of the crown sleeve expansion, until the crown sleeve and the inner wall of the female mold to reach the desired shape. Second, the production process: ① base preparation, mold, pour gypsum general methods. ② wax recovery adjoining point pruning substitute: Pruning plaster mold