Provisional Restoration

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Provisional Restoration

• ??? ???

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• ??
• Requirements
• Types of Provisional Restoration

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Temporary restoration? ??

• vital tooth? dentin? dentinal tubule??
  cytoplasmic fiber? ???? pulp chamber??
  odontoblast? ????. ??? dentin? ???? bacterial
  invasion, chemical thermal irritation ? pulp?
  ????. ?? ?? ???? hypersensitivity, inflammation,
  necrosis? ??? ??? ? ??.
• ???? vital tooth? preparation? ??? ??? temporary
  protection? ???? ??. ???? gingival margin?
  protection, ???? ?? ? ???? ?? ??? ???? ????.

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Requirements

• 1.pulpal protection
• - ? ???? ??? ?? saliva? leakage? ??? ?
• 2. positional stability
• - excursion?? drifiting? ??? ?.
• 3.Occlusal function
• - ?? ? ??? ??? ??? ? ??? ??.
• 4.Easily cleaned
• - gingival tissue? recession?? inflammation? ???
  ? ?? margin? ? ??? proper contour, surface polish

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• 5. Nonimpinging margins
• - ?? ??? ???? ?? ??? ??? ?? ?? ??. ? ?? ?? ??? ??
  ??? ??, ?? ?? ??? ???? ?? ?? ? ??? ??? ? ??.
• 6. Strength and retention
• - ????? ???? ??? ???? ?? ?? ? ??? ?.
• 7. esthetic
• - ?? ??? ????
• 8. diagnostic inflammation

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Types of Provisional Restoration

• 1)Prefabricated vs Custom restorations
• 2)Direct vs Indirect tech.
• ?Direct
• -????? ??? ?? ??? ?? ??
• -??? ??
• ?Indirect
• -?????? ????? ??
• ?poly(methyl methacrylate)? ??? ? 8?? ?????
• -?????? 70?? ??
• -?? ??? ??? ??

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• 1. aluminum shell
• ???? shell (can)? gingival margin ?? 0.5mm ?? ??
  ??? ??? ZOE cement ? ?? ??? ??? ? ?? ?? ????
  aluminum ? ???? ???? ???? ?? ??. ?? ???? ?????
  ???? ???? ??? ????? ??.

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• 2. cellulose or polycarbonate crown form
• ? ???? ??? ??? ??? ??? ?? ??? ?set? ??
• ???? ???? ???? ??? size? crown form? ??? ?? ?? ?
  ??? ?? temporary cementation
• ?? ? ???? ?? ?? ????, ?? ?? ? ????? ?? ??.

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procedure
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?? ??? ??? ???? ??? ?? ?? ??? dowel core? ?? ???
??? ?????? ???? ?? ???. Paper clip ?? ??? Wire?
?? ?? ?? ? ?? ??? ?? standard polycarbonate
crown? ???? ?? ??
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3. Preformed anatomic metal crown

• ??? ???? ??? ?? ?(?? ???? ?? ??? ??? ?? ??).
• ??
• ? ??? ?? ??
• ? Crown? ??? ??
• ? ?? ??? trimming? ??
• ? ???? cementation

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Masuring gauge
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Stretching block
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Custom acrylic provisional restoration

• lt properties of self-cured resingt
• monomer? polymer? ??
• methylmethacrylate ???? volume?? monomer
  polymer 1 3? ?? ???. ??? ??? ?? ??? polymer ??
  ???? ??.
• Closed bowl?? ?? ?? stage?? ????
• sandy stage, sticky stage ,dough stage(???? ??
  ??),rubber stage
• resin ??? ???? ?? curing ?
• ?? ??? ??? polymerization
• ??? ???, ?????? ?????? ?? porous?? ??? ??? ??
  ??. ??? ????.

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• ltbiologic compatibilitygt
• resin? monomer? pulp? ?? pulp gangrene,
  pulpitis??
• ?? polymerization ? ???? ???? ?? ???
  polymerization ? ? monomer? dentinal tubule? ??
  pulp ? ??
• ?????? pulp cooking

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1)Direct method

• 1. silicone putty? diagnostic wax up?? ??? ?? ??
  ??? ??? ??? ??? impression(?? ?? 0.02? vacuum
  formed plastic sheet?? ??)
• 2. impression?? interproximal impression
  material? ??? ??? ??
• 3. ?? ????? ????? ???? ?? ? ??? ?? self curing
  resin? dappen dish? ???? spatula? ??? ???? ?? ???
  ? ? impression? ???? ???? ??
• 4. resin? ?? ???? ? ????? ???? impression???? ??
• 5.????? margin, occlusion?? check?? ??
• 6. defect?? ?? bead brush??? resin? ???? ?? ??
• 7. pontic ???? embrasure?? ????? ???? ??
• 8. ?? (wet pumice, polishing compound)

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2)Indirect method

• ?? ?? ?? ??? resin? packing?? ?? direct method?
  ???.
• ????? ?? ? ??? ???? ?? ??? ??? ? ??? full
  contour? ??? ??? ??? plastic cell?? impression??
  ???? ????? ??? ??? resin packing ?
  polymerization.
• ?????? ??? ?? ???? ??? ??. Direct method ??
  resin allergy? 20? ???.
• ??
• -Overimpression-fabricated provisional crown
• -Template-fabricated provisional FPD

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Overimpression-fabricated provisional crown
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Template-fabricated provisional FPD
1 inch droop
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Vacuum forming machine? ?? ??
10?? ?? ???? ????
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• ??? ?? 5?? ??.
• Pontic? disc? bur? ???? proximal embrasure? ???
  ????(?)
• ?????? ????? ?? ?? saddle??? ??(?)
• pontic? ?????? ???? ??? ???? ??. ???? ???
  ????? ???? ?? ??? ???? pontic??? ???.

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Template? ??? VLC ?????

• ??? template? visible light-cured (VLC) resin?
  ???? ??? matrix? ?? ?? ??.

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??? ?? template? ???? ??? ? ??? ??? ?? ???? ??
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Shell? ??? ?? ???
???
???
Shell? ?? ??? ??? ??
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Overimpression?? ??? ?????(overimpression-fabrica
ted Bis-acrylic composite crown)

• ??? ?? ?? ???? ???, ???? ??? ???? ??.

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??? ??? ?????.