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我科自1977年研制成一种等分梅花型三瓣阴模壳冠缩颈器。经我科十年千余例的临床使用,效果良好。此种缩颈器采用铜或合金钢经车床装置特种车头车制而成。缩颈器整体呈圆柱型,其圆柱直径为4.5cm,高2cm,阴模槽由三个2/3圆弧相接形成等分梅花型三瓣,上端圆弧直径为2cm,下圆弧直径为1.5cm(图)经临床使用,具备以下优点:1.制作铅阴模方便:传统缩颈器一般采用三个分瓣钉形成三瓣,人为造成三等分,不易掌握。而此种缩颈
Our department since 1977 developed a sub-plum-type three-valve cast-metal crown neck necking. After more than a thousand years of clinical use of our department more than 10 years, the effect is good. This type of necking machine is made of copper or alloy steel with lathe equipment special front car. As a whole, the neck reducer has a cylinder diameter of 4.5 cm and a height of 2 cm. The female mold groove is formed by three 2/3 circular arcs to form a triple plum blossom type valve. The diameter of the upper end arc is 2 cm and the diameter of the lower circular arc 1.5cm (Figure) by clinical use, with the following advantages: 1. Lead making negative lead mode convenient: the traditional necking device uses three split-valve nail to form three, artificially cause trisend, not easy to grasp. And this necking