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Custom abutment help
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<blockquote data-quote="alamarlab" data-source="post: 13669" data-attributes="member: 591"><p>You have "over expanded" the investment. Which is fine if you like your copings a little "loose", but it allows the alloy to slip past and over the abutment (which doesn't expand as much as the investment). Adjust your investment for less expansion/tighter fit, usually more water/less liquid, same total volume.</p><p></p><p>I use a ringless system, Talladium Galaxy Universal Investment with their suggested dilutions, 20 min bench set, 20 min hot rapid burnout 1550F/843C.</p><p></p><p>Only miscast I ever had with abutments was when the Implant company sent me a Titanium abutment instead of a gold "cast to" one. FYI, the Titanium melts and becomes part of the ruined casting. Not a pretty picture.</p><p></p><p>Your investment may not be strong enough to handle the expansion of the plastic abutment part, which sometimes expand before melting.</p><p></p><p>Galaxy is a very strong investment, never had fins or blown up in oven with the rapid burnout technique. I have even pushed it with a 10 min set, 10 min burnout. Pretty cool to have a casting in 20 minutes. Of course I am sure all of you have never been rushed. Must be just me....j/k (Been doing this for 40 years now)</p><p></p><p>Good luck, Steve</p></blockquote><p></p>
[QUOTE="alamarlab, post: 13669, member: 591"] You have "over expanded" the investment. Which is fine if you like your copings a little "loose", but it allows the alloy to slip past and over the abutment (which doesn't expand as much as the investment). Adjust your investment for less expansion/tighter fit, usually more water/less liquid, same total volume. I use a ringless system, Talladium Galaxy Universal Investment with their suggested dilutions, 20 min bench set, 20 min hot rapid burnout 1550F/843C. Only miscast I ever had with abutments was when the Implant company sent me a Titanium abutment instead of a gold "cast to" one. FYI, the Titanium melts and becomes part of the ruined casting. Not a pretty picture. Your investment may not be strong enough to handle the expansion of the plastic abutment part, which sometimes expand before melting. Galaxy is a very strong investment, never had fins or blown up in oven with the rapid burnout technique. I have even pushed it with a 10 min set, 10 min burnout. Pretty cool to have a casting in 20 minutes. Of course I am sure all of you have never been rushed. Must be just me....j/k (Been doing this for 40 years now) Good luck, Steve [/QUOTE]
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