Which of the following is/are (an) acceptable mean(s) to obtain the gingival retraction that is needed when using an elastomeric impression material for making a final impression in fixed prosthodontics? 1. Electrosurgery. 2. A moist retraction cord. 3. A copper band that is removed when the impression is made. 4. Using a heavy body material in the impression tray.
All of the above.
(1) (2) (3)
(1) and (3)
(2) and (4)
(4) only
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