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Indirect Restorations - Coggle Diagram

- - - - Retention form
      - Resistance form
    - - Minimal display of metal
      - Porcelain occlusal surfaces
    - - Protect against fracture
      - Conserve tooth tissue
  - - - Ideal 3 degrees taper/6 degrees total occlusal convergence
      - Clinically achievable: 10-22 degrees total occlusal convergence
  - - - Interfere with arc of casting
      - In short prep, grooves in axial walls improve resistance
- - - - 45% fail in 5 years
      - 80% fail in 10 years
      - Must endo before crown if pulp has been exposed
  - - - Bandish et al 2006
      - Reeh and Messer 1989
      - McDonald 2005
      - Gonzalez-lopez et al 2005
- - - - All ceramic = PFM
    - - PFM = Densely sintered alumina crowns = Reinforced glass cermamics
      - Slightly lower survival: InCeram, Glass ceramics