Restorative & Materials · single question
Where should the Tofflemire (matrix) retainer/matrix band be positioned relative to the tooth?
Show answer and explanation
Correct answer: A. 1-2 mm above the highest cusp and 1-2 mm below the gingival margin
- A. Correct. The matrix band should extend approximately 1-2 mm above the highest cusp (to allow for adequate contouring/condensation) and approximately 1-2 mm below the gingival margin (to ensure proper proximal contour and seal at the gingival margin).
- B. Placing the band flush (without extension) risks inadequate contour and an incomplete seal at the gingival margin.
- C. 5 mm above the cusp is excessive and not the standard recommendation.
- D. 5 mm below the gingival margin is excessive and risks tissue trauma.
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