Question 164 · LDEK · Impressions and impression materials
Indicate the true statement concerning the retraction of marginal gingivae:
1) is crucial before taking an impression for fixed partial dentures;
2) the objective is to expose the preparation finish line and obtain the dry gingival sulcus by temporarily displacing gingival tissues;
3) the objective is to regenerate the trauma of marginal gingivae made during tooth preparation for the crown;
4) enables the penetration of impression material into the gingival sulcus and allows taking an exact and precise impression;
5) allows for an accurate reproduction of the oral cavity preparation in the dental laboratory;
6) gingival retraction is performed directly after teeth preparation;
7) performing gingival retraction directly after teeth preparation should be avoided;
8) taking optical impression of prepared teeth makes gingival retraction unnecessary.
The correct answer is:
2) the objective is to expose the preparation finish line and obtain the dry gingival sulcus by temporarily displacing gingival tissues;
3) the objective is to regenerate the trauma of marginal gingivae made during tooth preparation for the crown;
4) enables the penetration of impression material into the gingival sulcus and allows taking an exact and precise impression;
5) allows for an accurate reproduction of the oral cavity preparation in the dental laboratory;
6) gingival retraction is performed directly after teeth preparation;
7) performing gingival retraction directly after teeth preparation should be avoided;
8) taking optical impression of prepared teeth makes gingival retraction unnecessary.
The correct answer is:
- A. 1,2,4,5,7.
- B. 2,3,4,5.
- C. 3,4,6,8.
- D. 1,3,4,6,8.
- E. 3,5,6,8.
Hint
Ask whether retraction heals or displaces tissue, and whether freshly bleeding gingiva or an intraoral scanner changes the need for it.
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