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Endodontics · single question

Regarding placement of a Tofflemire matrix band for an amalgam restoration, where should the band be positioned relative to the cusp height and gingival margin?

  1. Extend about 1-2 mm above the highest cusp and about 1-2 mm below the gingival margin of the preparation
  2. Level with the marginal ridge only
  3. Below the cervical line by 5 mm
  4. Above the occlusal plane by 5 mm
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Correct answer: A. Extend about 1-2 mm above the highest cusp and about 1-2 mm below the gingival margin of the preparation

The band should extend roughly 1-2 mm beyond the cusp tips occlusally and 1-2 mm apical to the gingival cavosurface margin to allow proper contour and contact while sealing the proximal box.Other options: Positioning level with the marginal ridge or grossly over/under-extended prevents proper contour and a sealed proximal margin.Key exam takeaway: Tofflemire band: ~1-2 mm above the highest cusp and ~1-2 mm below the gingival margin.

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