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Principles of Cavity Designs

  • The cavity design and restoration should have minimal encroachment on the gingiva
  • The margins of the restoration should be smooth and not retentive to plaque
  • The margins should be cleansable.


  • Chemical adherence to enamel and dentin
  • It releases fluoride slowly
  • Margins can be left in areas which are difficult to clean
  • Weak and not abrasion resistant
  • Cermet contains silver to make abrasion resistance and radiopaque

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