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制作固定桥锤造壳冠时,用石膏阴模翻制铅代型,石膏易碎;用国产弹性打样膏翻制铅代型,凝固时间长,易因受热脱水而变形,铅代型表面易出现气泡。 1995年以来,我科采用改良法翻制,效果较好,介绍如下。1 方法:常规修制石膏代型,清水浸透,擦干。将橡皮圈放于玻璃板上,调制适量古莎藻酸盐印模材灌满皮圈,将石膏代型(牙合)面向下,垂直插入圈的中央,根部外露约5mm,数分钟后,印模材即初步结固,轻轻摇晃拔出石膏代型,用石腊油棉球轻涂印模材阴模内壁,
Manufacture of fixed bridge hammer shell crown, the cast with negative gypsum mold inverted generation, gypsum brittle; with domestic flexible proofing paste turned the lead generation, solidification for a long time, easy to deform due to heat dehydration, lead generation surface is easy Bubbles appear. Since 1995, our department has adopted the improved method of turning over and its effect is better. The introduction is as follows. 1 Method: Conventional repair gypsum generation, soaked in water, dry. Put the rubber band on the glass plate, adjust the amount of the ancient alginate imprinting material to fill the apron, place the plaster type (occlusal) face down and vertically into the center of the ring, expose the root about 5mm, after a few minutes, Stamping material that is the initial knot, gently shake the cast out gypsum generation, with paraffin oil light cotton ball coated die mold negative wall,