Rubber Dam on Crowned Tooth — NDEB AFK MCQ
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Correct answer: D — Place the clamp on an adjacent uncrowned tooth and use a slit dam technique
When a rubber dam clamp will not retain on a smooth crowned tooth, placing the clamp on an adjacent uncrowned tooth (with natural undercuts at the cervical area) and modifying the dam (slit technique) to expose the treatment tooth provides reliable isolation. Alternatively, floss ligatures, Wedjets, or Opal Dam can be used as supplementary stabilisation. Compound modification of the clamp jaws is another option but is less predictable.
Reference: Torabinejad – Endodontics: Principles and Practice, 6th ed., 2021