Intraoral repair of porcelain Fx.

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Intraoral repair of porcelain Fx.

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Porcelain Fx. ????

• 1. ???? coping design
• 2. Poor abutment preparation
• 3. Technical error
• 4. Contamination
• 5. Physical trauma
• 6. Occlusal prematurity

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Fx. ? ??? ?? ??

• 1. Porcelain? Fx.
• repair??? ?? ??.
• Porcelain-resin bonding strength
• gt resin-metal bonding strength
• 2. Metal ? ??? ??.
• 3. ???? metal? ??? ??.
• Ni-Cr alloy?? ?? ??
• ??? ??? oxide layer??.

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• Porcelain? strength
• 1.Compressive strength? ?
• 2.Tensile strength-??
• ?surface defect ??
• 3.Shear strength-??
• ?lack of ductility

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• Porcelain? ??
• ?Condensation
• ?Quartz? ?
• ?Aluminium, Zirconium??
• ??????crack?? defect? ??? ?.
• ?????void? ??? ?.
• ???
• ????????? (??? vitrification?? ????).
  cf)overfiring?? ?? ??

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• ??? ??? ??
• 1) ??? ??
• 2) ??? ?? ??? SiO2 ??? O
• ???? ??.
• ? ??? Sn, Fe, In? ?????degassing? ???? ??
• ? ???? ??? ?????? degassing? oxide layer? ?????
  ??? ??? ??? degassing? ?? ???? ???? ??? ?? ??? ??
  ??? ???? ?? ?????? ??.
• 3) Van der Waals force cohesion, adhesion
• 4) Compression stresssintered porcelain veneer?
  ???? ??(??? ???????? ??? ??)

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Repair?. Replacement? ???

• Time
• Economic
• Removal? ???? ???? trauma

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??? repair? ??? ???

• Fx.? porcelain ??? ?? ?? ? ??? ?
• Porcelain veneer ?? resin veneer? ?? ?? ?? ? ???
  ?
• Composite resin?? ?? ??? ?

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Fx.? ??? ?? ??? ??
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Porcelain veneer? ?? ?? ??
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Composite resin? ??? ?? ? repair
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Porcelain repair ??

• Porcelain preparation
• ? metal preparation
• ? etching
• ? silane
• ? bonding agent
• ? resin build-up

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Porcelain preparation

• Porcelain? mechanical roughing

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1.Coarse diamond bur ??

• 125-150?m (?? )
• Macromechanical retentive undercut
• ??
• multifluted carbide finishing bur? smooth
  finishing diamond burs? ??? ???.

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2.High-energy air abrasion

• Enamel? dentin? ??? ???? ???? ???.
• Dry? ???? ??? ?.
• Target area? ?? ?? ?? ?? ?? ??.
• ?? ?? ?? ? ?? restorative material? ??? ?? ??.

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3.Sandblast

• 1. ?? 50?m aluminum oxide? ??
• ? 5mm???? 6mm ? diameter
• ? 20 ?? ??
• ? cleansing ? dry
• 2. ?? micromechanical retention.
• ?? aluminum particle? ??
• bonding? ???.
• 3. ?? bonding strength 9-17 MPa ??

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metal ? preparation

• Metal ? ?? ? oxide layer? ??.
• Metal? ??? ?? ???? ??.

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1.Base metal alloy

• Sandblast? ??
• resin? ?? wetting effect? ??.
• ??
• 1. Bonding? ?? surface??.
• 2. Surface tension? ??.
• 3. Microscopically cleaning.
• ?? base alloy? alumina ??? 37
• ?? ??.

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2.Precious metal

• Sandblast? ? ???.
• ??
• precious metal? sharp retentive tin
• oxide crystals? coating.
• Tin plate?? sandblast? ?? ?? ??.

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Etching
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HF ( Hydrofluoric acid )

• ??? 9.5 HF gel? 4?? ??.
• 30?? air/water spray?
• rinsing
• ?? repair strength?
• ?? oral tissue? hazard
• ( ? 2.5 HF? ????? )
• cleaning ( discoloration ??)

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Phosphoric acid

• Porcelain etching ??? ??? silane? ? ??????
  porcelain ??? ?????.

• etching ??? feldspathic porcelain repair??? ??
  ???? ??? ? ?? porcelain ??? ? ??? ????.

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Silane coupling agent
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Silane? ??

• Organosilane coupling agents? siliceous glassy
  composite filler ? resins polymer? covalent
  bond?? ??? ??.
• Silane coupling ?? ???
• (H3) 3 - n
• I
• Y -- Si -- (OR)n n 2 or 3

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• OR?? ??? ??????? ??????? silanol ? ( SiOH)? ????.
  ? silanol ?? ceramic ??? ???? ???? ????
  siloxisan??? ??? ??.
• Y? vinyl?, epoxy?, amino?, merukapto? ? ?? ????
  ?? matrix?? ???? ???? ????? ??

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• Silane coupling?? ???? ceramic ??? ??, ??? ?? ???
  ????? ??? ???? siloxane ??? ??? ???? ???? ???.
• Silane? ???
• ????? ??
• ????? OH ?? ??? ????
• ??? ??? ? ??.

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CIMARA

• Porcelain repairing kit

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??

• ????? ?? ??.
• 1?? bur? silane? ??.
• ??? metal??? ceramic ??? ?? ?? ??.
• Sandblast? etching??? ????.
• metal color? ??? ?? opaque powder? ??.

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?? ?? ??

• Ceramic / metal framework? composite? gap?? ??
• ??
• 1. Coupling silane
• 2. Opaque liquid
• 3. Opaque powder

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1...

• ?? ??? ??
• rubber dam ??
• metal ??? ???? corundum grinder? ?? ??? ?? ????
  ???.

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2...

• Ceramic?? ??? ???? 2mm bevel? ? ? oil ??? ?? air?
  ceramic, metal ??? ?? ???.

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3...

• Ceramic ?? margin?? Cimara grinding bur?
  6,000-10,000 rpm ?? ?? ???? ??? ??.

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4...

• Metal ? ceramic??? ??? ?.
• Ceramic margin? metal? silane? ?? ??? 2?? ?? ?.

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5...

• Powder liquid1 1.5 (????)? ???? metal ??? ??
  ??? 40? ?? ??? ??.

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6...

• Ceramic margin? opaque liquid? ??? 20?? ???.

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7...

• ?? ???? ceramic ????? ???? ????? ??? ? ? ????.

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Super-bond ? porcelain Liner-M? ??? porcelain ??
??
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??

• ?? ?? ??? ???? repair strength? ?? ?????? ??? ?
  ??? ??. ( temporary use )
• ??? porcelain Fx. Tooth? ???
• ???? ????? ?? ?? condition? ??? ??? ? ? ?
  repair process? ??? ? ? ??? ????.