rkm rdt
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Check your investment instructions.Most do not recommend speed burnout with plastic components.
, RKM rdt, if you go back and reread posting 8, speed burnout technique was not used..
Check your investment instructions.Most do not recommend speed burnout with plastic components.
Glad you got it worked out, I will caution people that say they just run glass down as shown in some diagrams. The picture with the shoulder of the gold cylinder exposed can be perfectly fine because you are still getting the opaque to stick to the casting alloy. If your alloy flashes close you will still have an alloy that oxidizes. so that means you opaque will stick. If you think you can run the opaque down on the collar of the UCLA you will soon find that the opaque can flake off the "non Oxidizing" gold they use for the UCLAs. bases.
John/anyone.
If you do get it opaqued and stacked without any problems would it still probably pose a problem with crown flex? chipping from the weakest area(non oxidized collor)?
kinda like the bond of porcelain to ZR and Ti..no (oxidation) bonding layer....
:sorry:
First off, I would like to thank everybody for all of their input and words of wisdom regarding my “flash” issue on UCLA abutments.
I did another casting today, modifying my water\powder ratios, so I’d get less expansion. It worked!
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I also like to add my two cents worth regarding how this whole thread evolved. The discussion about running porcelain down onto virgin UCLA alloy, was interesting, and is something that I would probably try in the future. Off track? Definitely, but also was important information to get out there.
What initially I found frustrating, which then turned into a humorous situation, was that the idea that I was using speed investment just kind of got ingrained in everybody’s minds. But, the fact that so many talked about using speed investment, made me realize that I need to work more on refining that technique with my gold crowns.
Thanks again all! Carol
Isn't the question about doing full cast Au screw retained crowns? Why are we questioning porcelain application?