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Lab talk, the good, the bad, and the ugly
Metal
np nickle free alloys
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<blockquote data-quote="concern pt" data-source="post: 146541" data-attributes="member: 11378"><p>ok thank you everyone for your suggestions. Unfortunately we have tried all these options. We are still having bonding issues, fracturing on anteriors as well as some posteriors now as well. We use a paste to slurry then spray (powder opague) on the shade. We use the method set by metal company from sandblasting to degassing, temp, vac, hotplate etc. I have personally set my oven temp a little lower and set my cooling time to 8 mins which has worked wonderful but while being finished, glazed, polished or steamed and at times even after it has reach the dentist we are still fracturing just the porcelain or all the way to metal indicating a bonding issue. We are even massaging the slurry into metal as you would a captec crown with paste per another lab suggestion. Could the shape or thickness of the metals be an issue? Is there a way to stop the oxide forming at every fire? I'm wondering if this oxide could be the problem dispite r sandblasting before slurrying. It still clearly forms inside the crown even after it has been slurried because it causes a green discoloration after the spray opague has been applied and fired at times around the margin of crown and needs to be touched up.??? We have seen some improvement but not enough even one fracturing is disappointing, wasted time and material.</p><p>Thank you</p><p>Frustrated Porc. tech.</p></blockquote><p></p>
[QUOTE="concern pt, post: 146541, member: 11378"] ok thank you everyone for your suggestions. Unfortunately we have tried all these options. We are still having bonding issues, fracturing on anteriors as well as some posteriors now as well. We use a paste to slurry then spray (powder opague) on the shade. We use the method set by metal company from sandblasting to degassing, temp, vac, hotplate etc. I have personally set my oven temp a little lower and set my cooling time to 8 mins which has worked wonderful but while being finished, glazed, polished or steamed and at times even after it has reach the dentist we are still fracturing just the porcelain or all the way to metal indicating a bonding issue. We are even massaging the slurry into metal as you would a captec crown with paste per another lab suggestion. Could the shape or thickness of the metals be an issue? Is there a way to stop the oxide forming at every fire? I'm wondering if this oxide could be the problem dispite r sandblasting before slurrying. It still clearly forms inside the crown even after it has been slurried because it causes a green discoloration after the spray opague has been applied and fired at times around the margin of crown and needs to be touched up.??? We have seen some improvement but not enough even one fracturing is disappointing, wasted time and material. Thank you Frustrated Porc. tech. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
np nickle free alloys
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