Which cavosurface margin is most appropriate for a conventional amalgam restoration?

  • Correct answer

    A 90-degree butt joint

  • A 45-degree bevel

  • A long bevel extending onto the enamel surface

  • A chamfer

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

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Explanations

  • Amalgam has low edge strength, so the margin should meet the tooth at about 90 degrees to give bulk at the edge. A bevel leaves thin amalgam margins that fracture.

    Source: Ritter, Boushell and Walter, Sturdevant's Art and Science of Operative Dentistry — oneguy

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