What is the objective of gingival retraction (tissue displacement) before impression making?

Patient case: Tissue displacement, facial pattern and complete dentures

Scenario: Three prosthodontic and orthodontic items.

To choose the cement based on the margin location
To harden the sulcular epithelium so it resists tearing
To place the gingival margin permanently apical to the preparation
To displace the tissue both laterally and vertically so the finish line is exposed and reproduced

Show answer and explanation

Correct answer: D. To displace the tissue both laterally and vertically so the finish line is exposed and reproduced

A. Cement selection follows from the restorative material, not from the retraction technique.
B. Retraction does not harden tissue. Chemical agents cause transient shrinkage through vasoconstriction or protein precipitation, not hardening.
C. Retraction is a temporary, reversible displacement. Permanently repositioning the margin apically is crown lengthening, a surgical procedure.
D. Correct. Retraction has two components: lateral displacement widens the sulcus so impression material can flow around the margin, and vertical displacement exposes a band of unprepared tooth apical to the finish line.