Applies and Removes Dental Dam
Isolation is the point
The dental dam provides a dry, clean, isolated field, protects the patient from aspiration or swallowing of debris and materials, and retracts soft tissue. Know the armamentarium: dam material, punch, clamp and forceps, frame, floss ligature, and lubricant. Know the sequence and the reasons behind each step.
Placement sequence to understand
- Assess and record any latex allergy; choose a latex-free dam if indicated.
- Punch holes with correct size and spacing matched to the tooth and arch.
- Seat the clamp on the anchor tooth and verify stability.
- Stretch the dam over the clamp, then over remaining teeth, using floss to carry the material through contacts.
- Invert the dam margins into the sulcus with a blunt instrument to seal.
- Verify the seal and that the airway is protected.
Removal
Remove floss ligatures, then the clamp with forceps while stabilizing the dam, then the dam itself. Inspect the field and the dam for missing fragments.
Traps
Questions often ask why a step is done, not just what it is. Inverting margins seals the field; it is not cosmetic. Another trap: the clamp goes on the anchor tooth, usually the most posterior tooth in the field, not the tooth being treated. Also expect latex allergy and airway protection as safety distractors.
Rule of thumb
Anchor posterior, seal the margin, protect the airway. If an answer choice skips verifying the seal or the airway, it is likely wrong.