TEMPORIZATION OR PROVISIONAL RESTORATION

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TEMPORIZATION ORPROVISIONAL RESTORATION
dr shabeel pn
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• 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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IDEAL IDEALREQUIREMENTS OF PROVISIONAL
RESTORATION
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BIOLOGIC REQUIREMENTS

• PROVISIONAL RESTORATION SHOULD
• PROTECT THE PULP BECAUSE A FRESHLY PREPARED TOOTH
  WILL HAVE INCREASED SENSITIVITY
• MAINTAIN PERIODONTAL HEALTH(GOOD MARGINAL FIT)

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• BE OCCLUSALLY
• COMPATIBLE
• PROTECT AGAINST FRACTURE

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MECHANICAL REQUIREMENTS

• PROVISIONAL RESTORATION SHOULD
• RESIST FUNCTIONAL LOADS
• RESIST REMOVAL FORCES
• MAINTAIN INTERABUTMENT ALIGNMENT

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ESTHETIC REQUIREMENTS

• PROVISIONAL RESTORATION SHOULD
• BE EASILY CONTOURABLE
• BE COLOR COMPATIBLE
• BE TRANSLUCENT
• BE COLOR STABLE

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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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TYPES OF PROVISIONAL RESTORATION
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DEPENDING ON THE METHOD OF FABRICATION
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• CUSTOM MADE PROVISIONAL RESTORATION
• PREFABRICATED PROVISIONAL RESTORATION

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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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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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DEPENDING ON THE MATERIAL AVAILABLE IN
PREFORMED CROWNS
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• POLYCARBONATE
• CELLULOSE ACETATE
• ALUMINIUM AND TIN-SILVER
• NICKEL-CHROMIUM

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DEPENDING ON THE TYPE OF MATERIAL USED
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• RESIN BASED PROVISIONAL RESTORATION
• ?CELLULOSE ACETATE
• ?POLYCARBONATE
• ?POLY-METHYL METHACRYLATE
• ?POLY-R METHACRYLATE
• ?MICROFILLED COMPOSITE
• ?URETHANE DIMETHACRYLATE
• METAL PROVISIONAL RESTORATION
• ?ALUMINIUM
• ?NICKEL-CHROMIUM
• ?TIN-SILVER

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DEPENDING ON THE DURATION OF USE
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• SHORT TERM TEMPORARY RESTORATION
• LONG TERM TEMPORARY RESTORATION

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DEPENDING ON TECHNIQUE OF FABRICATION
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• PROVISIONAL RESTORATION FABRICATED USING DIRECT
  TECHNIQUE
• PROVISIONAL RESTORATION FABRICATED USING INDIRECT
  TECHNIQUE
• PROVISIONAL RESTORATION FABRICATED USING
  DIRECT-INDIRECT TECHNIQUE

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TECHNIQUES FOR CUSTOM PROVISIONAL
RESTORATION
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• OVERIMPRESSION FABRICATED PROVISIONAL CROWN
• TEMPLATE FABRICATED PROVISIONAL FIXED PARTIAL
  DENTURE
• TEMPLATE FABRICATED VLC PROVISIONAL RESTORATION
• SHELL-FABRICATED PROVISIONAL RESTORATION
• OVERIMPRESSION FABRICATED BIS-ACRYL COMPOSITE
  CROWN

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OVERIMPRESSIONFABRICATED PROVISIONAL CROWN
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• 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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• 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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• 6.WHEN THE TOOTH PREPARATION IS COMPLETED,ANOTHER
  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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• 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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• .
• .
• 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 LARGE RUBBER BAND

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• 15.PLACE THE OVERIMPRESSION-PLASTER 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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• 17.FINALLY THE RESTORATION IS FINISHED,POLISHED
  AND CEMENTED

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Thank You