Violation

Effective tissue displacement with elastic impression materials can be accomplished by 1. injection of the material into the gingival sulcus. 2. placement of chemical-impregnated cords into the gingival sulcus. 3. electrosurgical means. 4. a firm tray material.

All of the above

(1) (2) (3)

(1) and (3)

(2) and (4)

(4) only

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