What minimum height of sound vertical tooth structure coronal to the crown margin is generally recommended to provide a ferrule effect?

  • Correct answer

    1.5 to 2 mm

  • 0.5 mm

  • 4 to 5 mm

  • 6 to 8 mm

This question is one of 15 in AFK practice: Restorative, prosthodontics and implants. Test yourself on all of them.

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Explanations

  • A circumferential band of about 1.5-2 mm of sound dentin above the finish line, encircled by the crown, greatly increases fracture resistance of an endodontically treated tooth. Less than this gives little ferrule effect.

    Source: Rosenstiel, Land and Walter, Contemporary Fixed Prosthodontics — oneguy

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