2. “PROVISIONAL”-
ESTABLISHED FOR TIME
BEING,PENDING A
PERMANENT
ARRANGEMENT.
AFTER TOOTH
PREPARATION
TEMPORARY PROTECTIVE
OR FUNCTIONAL
RESTORATION IS
FABRICATED OVER THE
PREPARED TOOTH TO BE
USED UNTIL FABRICATION
OF FINAL PROSTHESIS
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9. INDICATION
A
LONG SPAN POSTERIOR FPD
PROLONGED TREATMENT TIME
PATIENT UNABLE TO AVOID
EXCESSIVE FORCES ON THE
PROSTHESIS
ABOVE AVERAGE MASTICATORY
MUSCLE STRENGTH
HISTORY OF FREQUENT BREAKAGE
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11. TYPE OF PROVISIONAL RESTORATION
BASED ON
..
METHOD OF FABRICATION
MATERIALS AVAILABLE IN PREFORMED CROWNS
TYPE OF MATERIAL USED
DURATION OF USE
TECHNIQUE FOR FABRICATION
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14. CUSTOM MADE PROVISIONAL
RESTORATION
THIS
RESTORATION IS FABRICATED
TO REPRODUCE THE ORIGINAL
CONTOURS OF THE TOOTH
AN IMPRESSION OF THE PREPARED
TOOTH IS MADE AND A CAST IS
POURED
PREPARED TOOTH ON THE CAST IS
WAXED UP AND CARVED TO
REPRODUCE THE ORIGINAL
CONTOURS
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15. PREFORMED PROVISIONAL
RESTORATION
THESE
ARE COMMERCIALLY
AVAILABLE PREFABRICATED CROWNS
AVAILABLE IN VARIOUS SIZES
OPERATOR CHOOSES THE BEST ONE
SUIT TO THE PATIENT
BEFORE CEMENTATION THESE
CROWNS ARE SLIGHTLY ALTERED
AND MODIFIED TO FIT THE TOOTH
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27. 1.COMMONLY DONE WITH
ALGINATE IMPRESSION
MATERIAL
2.OVERIMPRESSION CAN
BE MADE FROM THE
PATIENTS MOUTH OR
FROM THE DIAGNOSTIC
CAST.
3.WHEN THE ALGINATE
HAS SET
OVERIMPRESSION IS
REMOVED AND
CHECKED FOR
COMPLETENESS.
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28. 4.THIN FLASHES OF
IMPRESSION MATERIAL THAT
REPLICATE THE GINGIVAL
CREVICE ARE REMOVED TO
INSURE THAT NO
IMPEDIMENT TO THE
COMPLETE SEATING OF THE
CAST INTO THE
OVERIMPRESSION LATER.
5.IMPRESSION IS THEN
WRAPPED IN A WET PAPER
TOWEL AND PLACED IN A
ZIPLOCK PLASTIC BAG FOR
LATER USE.
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29. 6.WHEN THE TOOTH
PREPARATION IS
COMPLETED,ANOTHE
R QUADRANT
IMPRESSION IS MADE
WITH ALGINATE
7.THIS IMPRESSION IS
THEN POURED WITH
A THIN MIX OF QUICK
SETTING PLASTER.
8.THEN TRY TRIMMED
QUICK SET PLASTER
CAST IN THE
OVERIMPRESION TO
MAKE SURE THAT IT
WILL SEAT
COMPLETELY
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30. 9.COAT THE PREPARED
TOOTH AND ADJACENT
AREAS OF THE CAST
LIBERALLY WITH A “TIN
FOIL SUBSTITUTE”
SEPERATING MEDIUM
10.MIX TOOTH COLORED
ACRYLIC RESIN IN A
DAPPEN DISH WITH A
CEMENT SPATULA
11.PLACE THE RESIN IN THE
OVERIMPRESSION SO
THAT IT COMPLETELY
FILLS THE CROWN AREA
OF THE TOOTH
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31. .
.
12.SEAT THE CAST INTO THE
OVERIMPRESSION ,MAKING
SURE THAT THE TEETH ON
THE CAST ARE ACCURATELY
ALIGNED WITH THE TOOTH
IMPRESSION.
13.FORCE USED TO SEAT THE
CAST INTO THE ALGINATE
IMPRESSION IS
CRITICAL.EXCESSIVE FORCE
CAN OVERSEAT THE CAST
AND UNEVEN FORCE CAN
TORQUE THE CAST.
14.ONCE THE CAST HAS BEEN
FIRMLY SEATED HOLD THE
CAST IN PLACE WITH A
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LARGE RUBBER BAND
32. 15.PLACE THE OVERIMPRESSIONPLASTER CAST ASSEMBLY IN A
PLASTER BOWL FULL OF HOT TAP
WATER OR APPROX. 5 MIN OR INTO A
PRESSURE POT UNDER 20 PSI.
16.WHEN THE RESIN HAS
POLYMERISED.REMOVE THE RUBBER
BAND TO DISASSEMBLE IT.
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