wwcanoer
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I need help trying to figure out what I'm doing wrong!
I am trying to cast custom abutments, from Implant Direct, and not having much luck.
My recent misadventure: waxed up, sprued acording to their diagram, cleaned "platform's with burning alcohol before investing. Using Cristobalite from Whipmix using my normal "gold water/powder ratio". Bench set in a humidor environment for one hour. No de-bubblizer used
Burn-out at 148° C, with a 5 degree/minute climb held for 1.5 hrs.,. Then to 565°C at 5 degree/minute held for 1.5 hrs. ., bench cooled. Cast with type III (63% gold alloy),
As you can tell from picture number one, I had gold flash up and over the outside of the abutment-platform wall into the hexed. (I will admit, I am probably not calling the platform components by their proper names)
In picture number two: a different perspective of the gold flash. You'll also notice that I tried to run a fine bead of wax around the junction between the platform and my waxed crown. And yes, I would say that there was a separation, or short cast?, of some sort at that junction.
Called up the tech help people at Implant Direct, and had a not very satisfying conversation with them. Admittedly, upfront they admitted that they are not technicians but gave me the following advice. Never never have your holding time at the high temperature to exceed one hour. I also e-mailed them pictures of my problems. Again, their follow-up phone calls were great, and did notify me that their laboratory technician troubleshooter was unavailable. Maybe next week. . .
Picture number three:
New abutment, re-wax the crown with these changes
after cleaning everything with burning alcohol, which I do after everything is sprued, let bench set for about a half an hour to make sure all residue has evaporated, I also used a brand-new analog to hold my wax-up just to make sure that I didn't have any contamination from that source.
Then
1) first stage burnout held for only one hour
2) final burnout temperature held for only one hour
As you can see, I still have flash going up the side of the platform, only it stopped just short of the top. You also notice, that I still had "separation" between my waxed and platform junction.
Any thoughts? With custom abutments at $100 a pop, I need to figure this out real quick!
Carol E E
PICTURE # 1
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PICTURE #2
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PICTURE #3
[/IMG]
Carol
I am trying to cast custom abutments, from Implant Direct, and not having much luck.
My recent misadventure: waxed up, sprued acording to their diagram, cleaned "platform's with burning alcohol before investing. Using Cristobalite from Whipmix using my normal "gold water/powder ratio". Bench set in a humidor environment for one hour. No de-bubblizer used
Burn-out at 148° C, with a 5 degree/minute climb held for 1.5 hrs.,. Then to 565°C at 5 degree/minute held for 1.5 hrs. ., bench cooled. Cast with type III (63% gold alloy),
As you can tell from picture number one, I had gold flash up and over the outside of the abutment-platform wall into the hexed. (I will admit, I am probably not calling the platform components by their proper names)
In picture number two: a different perspective of the gold flash. You'll also notice that I tried to run a fine bead of wax around the junction between the platform and my waxed crown. And yes, I would say that there was a separation, or short cast?, of some sort at that junction.
Called up the tech help people at Implant Direct, and had a not very satisfying conversation with them. Admittedly, upfront they admitted that they are not technicians but gave me the following advice. Never never have your holding time at the high temperature to exceed one hour. I also e-mailed them pictures of my problems. Again, their follow-up phone calls were great, and did notify me that their laboratory technician troubleshooter was unavailable. Maybe next week. . .
Picture number three:
New abutment, re-wax the crown with these changes
after cleaning everything with burning alcohol, which I do after everything is sprued, let bench set for about a half an hour to make sure all residue has evaporated, I also used a brand-new analog to hold my wax-up just to make sure that I didn't have any contamination from that source.
Then
1) first stage burnout held for only one hour
2) final burnout temperature held for only one hour
As you can see, I still have flash going up the side of the platform, only it stopped just short of the top. You also notice, that I still had "separation" between my waxed and platform junction.
Any thoughts? With custom abutments at $100 a pop, I need to figure this out real quick!
Carol E E
PICTURE # 1
PICTURE #2
PICTURE #3
Carol