wwcanoer
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Help! What am I doing wrong?
This is my first case for screw retained PFM's. #8, and #9 with cantilevered #10.
The first one, # 8, I just had flash on the outside of the platform, and was able to rubber wheel it off.
The second casting was for the cantilevered bridge,#9 and #10.
As you can see from the pictures, there is flash on the outside going around to the inside of the platform!
The metal is Aquarius Hard cast to an Implant Direct custom abutment. Investment was Creare--vest high heat investment. I used half millimeter less liquid, half millimeter more water than for a regular casting when investing for Aquarius Hard metal as advised. I have found that I have to use a thick bead of wax at the junction of the wax and the abutment, or I end up with voids, and two vent wires. I don't have problems with screw retained gold crowns, or with cast gold custom abutments.
Still too much expansion?
These two were cast separately, but with identical techniques. Any thoughts and advice would be greatly appreciated.
Carol
This is my first case for screw retained PFM's. #8, and #9 with cantilevered #10.
The first one, # 8, I just had flash on the outside of the platform, and was able to rubber wheel it off.
The second casting was for the cantilevered bridge,#9 and #10.
As you can see from the pictures, there is flash on the outside going around to the inside of the platform!
The metal is Aquarius Hard cast to an Implant Direct custom abutment. Investment was Creare--vest high heat investment. I used half millimeter less liquid, half millimeter more water than for a regular casting when investing for Aquarius Hard metal as advised. I have found that I have to use a thick bead of wax at the junction of the wax and the abutment, or I end up with voids, and two vent wires. I don't have problems with screw retained gold crowns, or with cast gold custom abutments.
Still too much expansion?
These two were cast separately, but with identical techniques. Any thoughts and advice would be greatly appreciated.
Carol