How far should the occlusal edge of a matrix band extend relative to the adjacent marginal ridge?

Correct answer: B. Approximately 1 mm above it

• A. Excessive height obscures the operative field and encourages overpacking and overcarving.
• B. CORRECT. The band should extend about 1 mm above the adjacent marginal ridge. This gives just enough height to contain and condense the amalgam to full marginal ridge contour, while keeping the band low enough that the operator can see the ridge form and carve it accurately.
• C. A band below the ridge cannot support restoration of the ridge at all.
• D. A band level with the ridge cannot contain the material during condensation, and the ridge is left deficient.

Note: Apically, the band must extend just beyond the gingival cavosurface margin and be sealed there by a firmly placed WEDGE — this is what prevents a gingival overhang.