A practical treatise on artificial crown- and bridge-work . ched quite hard over the mandrel and post, so that theserrations of the pliers will roughen the pins to prevent theirbeing pulled through the backing, which should also be carefullycondensed around the pins and post. When the root is much decayed, the bottom of the cone-shaped cavity may be drilled and tapped to the depth of a six- rilE HOW CROWNS AND METHODS. 59 toeiith of ail inch, and tin- ]iost, thus aiuhinvd, may he fiirtliersecured by cenieiit in tlic i^rooved walls of the cavity ami aroundthe post (Fig. 61). • Tiic screw-posts
A practical treatise on artificial crown- and bridge-work . ched quite hard over the mandrel and post, so that theserrations of the pliers will roughen the pins to prevent theirbeing pulled through the backing, which should also be carefullycondensed around the pins and post. When the root is much decayed, the bottom of the cone-shaped cavity may be drilled and tapped to the depth of a six- rilE HOW CROWNS AND METHODS. 59 toeiith of ail inch, and tin- ]iost, thus aiuhinvd, may he fiirtliersecured by cenieiit in tlic i^rooved walls of the cavity ami aroundthe post (Fig. 61). • Tiic screw-posts are made of crown metal, an alloy devisedfor the purpose in order to ohtaiii a stitt [)ost that will permitthe cuttiiiii: of the peculiar and extremely accurate thread formedupon it, and which will not annduamate or he otherwise atfectedhy any haekin>,^-mateiial that may he used. Of course platinumor [ilatinum alloyed with iridium may he emjdoyed for posts,hut the crown metal is in every way su[ierior. Fig. 62. Fig. 63. Fig. 64. Fig. 65. Fig. <;
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcrowns, bookyear1889
