For a single restoration choose indexed UCLAs and for a splinted or
bridge restoration choose non indexed UCLAs. |
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1. |
Remove the soft tissue mulange and screw the UCLA on to the analog on the working model
to affirm proper seating of the UCLA on to the analog. |
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2. |
Reduce the height of the plastic tube to allow for adequate
porcelain thickness. |
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3. |
Wax up the substructure to develop enough support for the porcelain. |
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4. |
Create a collar of at least 0.5mm thickness above the metal indexing
feature of the UCLA because most implant manufacturers use a alloy not
compatible with porcelain application. Some implant manufacturers
(Straumann) do offer UCLAs machined with a porcelain compatible metal. |
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5. |
Remove the wax up from the model and clean the index with rubbing
alcohol and a cotton swab. |
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6. |
Sprue the wax up following the long axis of the sprue as close as
possible. This will allow the investment to freely flow through the screw
access channel of the UCLA when pouring the investment into the casting
ring. |
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7. |
Preheat the muffle and cast on in a metal alloy suitable for porcelain
application. Do not exceed the solidus of the UCLA during preheating. Non precious alloys
should not be used for any implant restoration. |
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8. |
Divest the cast with a ultra sound and acid bath, avoid sand
blasting. |
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9. |
Finish the metal framework the same way a normal PFM would be finished.
Take care not to damage the indexing feature of the cast on UCLA. To
protect the index during finishing attach the cast to an extra analog.
Confirm the screw slides in to the screw access channel without binding. |
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10. |
Opaque and apply porcelain to the finished metal frames. To keep
porcelain out of the screw access channel apply some porcelain separator
to the shaft of a bur and place in the screw access hole during
porcelain application. Remove the
soft tissue mulange to establish a ideal emergence profile. |
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11. |
Remove the crowns and replace the soft tissue mulange. Adjust the
emergence profile to the dentists preference. |
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12. |
Implant restorations should only have very light occlusal contacts
or even slightly out of contact. Only one occlusal contact directly over
the implant is recommended. No lateral interference of any kind and the
occlusal width needs to be only two thirds of the occlusal the implant
restoration is replacing |
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13. |
Polish the collar after glazing the porcelain, utilizing a analog as
a polishing protector. Confirm the screw slides in to the screw access
channel without binding. |
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