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Implants
Custom abutment help
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<blockquote data-quote="JohnWilson" data-source="post: 13749" data-attributes="member: 213"><p>You have to be carful with this as this can over expand the ring as well.</p><p></p><p>Truth is miscasts are rarely caused by too cold a ring but more because of improper burnout when it comes to "Casting to" another object. The non oxidizing metal needs to be at the proper casting temperature to have a good interface, but the investment needs to be pristine for optimal results. Anytime you burn out plastic/lexan/duralay or any pattern resin it needs to be staged to take stress off the mold from the material expanding as it burns.</p><p></p><p>We have found PD/Au based alloys seem to work the best for us for screw retained cases. When we are forced to do a wax and cast abutment we choose to use a predominately PD based Nobel alloy.</p><p></p><p>Truth is this technique for my lab is almost obsolete. Cad cam will virtually eliminate all but molar screw retained crowns.</p></blockquote><p></p>
[QUOTE="JohnWilson, post: 13749, member: 213"] You have to be carful with this as this can over expand the ring as well. Truth is miscasts are rarely caused by too cold a ring but more because of improper burnout when it comes to "Casting to" another object. The non oxidizing metal needs to be at the proper casting temperature to have a good interface, but the investment needs to be pristine for optimal results. Anytime you burn out plastic/lexan/duralay or any pattern resin it needs to be staged to take stress off the mold from the material expanding as it burns. We have found PD/Au based alloys seem to work the best for us for screw retained cases. When we are forced to do a wax and cast abutment we choose to use a predominately PD based Nobel alloy. Truth is this technique for my lab is almost obsolete. Cad cam will virtually eliminate all but molar screw retained crowns. [/QUOTE]
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