Provisional crowns & methods

Matrix
1. From pre-op
  1. Putty/alginate
  2. Material choices
    1. Acrylic
      1. Bosworth trim PMMA
        Hand mixed
        effort
        easier to add to
        more flexible
        High shrinkage
      2. indications
        Provisionals around partial dentures
        Relining shell provisionals
    2. Bis acryl composite
      1. Quick temp
        Adv
        Quick set
        Low exotherm & shrinkage
        Easier to adjust occlusion compared to shells
        Disadv
        Harder to add to
        Remember if there is a composite core then add vaseline before so it doesn't bond to it
  3. Cementation materials
    1. Zinc oxide
      1. Temp bond
        Non-eugenol for composite core
      2. Indications
        Resistance & retention form satisfactory
    2. polycarboxylate
      1. poly f
      2. Indications
        Resistance & retention form unsatisfactory
2. From wax-up
3. From intra-oral build up
Why make them?
1. Diagnostic
  1. Pulp prognosis
  2. Aesthetics
  3. Reorganising occlusion
2. Aesthetics
3. Prevent-over-eruption
4. Prevent tipping
5. Pulpal protection
  1. Thermal
  2. Bacterial
6. Gingival management
  1. Maintain health
  2. Prevent overgrowth
Shell
1. Lab made
  1. acrylic
  2. composite
  3. Reline with acrylic
2. Pre-fabricated
  1. materials
    1. polycarbonate
      1. tooth coloured
    2. stainless steel
      1. Then take an imp of that and reline with bisacryl which is easier to adjust
    3. aluminium
      1. soft
      2. hard
  2. Reline with acrylic
Freehand
Veneers
1. 1a) spot etch and bond
2. Cure composite to prep
Temporising unretentive preps
1. Options
  1. No temporary
  2. Spot etch
  3. Zinc polycarboxylate &bisacryl
  4. Cure the tooth to prep
  5. Composite on opposing tooth to prevent over-eruption
  6. Thin layer of zinc phosphate over dentine
  7. Cure composite directly to tooth
    1. Shrink rap
2. E.g
  1. RBB
  2. Onlays
  3. Veneers
  4. Crowns

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Provisional crowns & methods

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