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The effect of displacement time on gingival crevice width
H Baharav1, B Z Laufer, Y Langer
1Section of Oral Rehabilitation, Maurice and Gabriela Goldschleger School of Dental Medicine, University of Tel Aviv, Israel.
The International Journal of Prosthodontics
|May 1, 1997
Summary
For optimal dental impressions, medicated displacement cord should remain in the gingival crevice for 4 minutes. This duration ensures adequate sulcus opening for accurate measurements and material placement.
Area of Science:
- Dentistry
- Periodontology
- Prosthodontics
Background:
- Accurate dental impressions require adequate gingival sulcus displacement.
- The duration of medicated cord placement influences sulcus closure and impression accuracy.
Purpose of the Study:
- To determine the optimal duration for medicated gingival displacement cord placement before dental impression making.
- To evaluate the effect of different cord placement times on gingival crevice width and closure.
Main Methods:
- Medicated cords (Hemodent on Ultrapak #1) were placed in the gingival sulcus for 2, 4, 6, and 8 minutes.
- Gingival crevice closure was recorded using a miniature video camera after cord removal.
- Crevicular widths were measured at midbuccal and transitional line angle areas.
Main Results:
- Gingival crevices displaced for 2 minutes showed significantly smaller widths compared to 4, 6, and 8 minutes.
- No significant difference in crevice width was observed for displacements of 4, 6, and 8 minutes.
- Optimal displacement for a 0.2 mm crevicular width was achieved with 4 minutes of cord placement.
Conclusions:
- A 4-minute placement of medicated displacement cord is optimal for achieving adequate gingival crevice width for dental impressions.
- Placement times of 4, 6, and 8 minutes result in comparable sulcus closure.
- The transitional line angle area consistently exhibited smaller crevicular widths than the midbuccal area.