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Gingival displacement before impression making: A prospective, comparative randomized clinical trial.

Marie Desclos-Theveniau¹, Hugo Abgrall², Vincent Bar²

¹Associate Professor, Department of Prosthodontics, Nutrition Metabolisms and Cancer, U1317 INSERM, INRAE, UNIVREN, Rennes University Hospital Center (CHU Rennes), CIC 1414, Rennes, France.

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Summary

Racestyptine and Racegel, with or without cords, effectively create sufficient gingival displacement for accurate dental impressions. These techniques ensure adequate sulcus opening without causing periodontal damage, meeting prosthodontic requirements.

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Area of Science:

Dental Prosthodontics
Periodontology
Biomaterials Science

Background:

Gingival displacement is crucial for accurate dental impressions in prosthodontics.
A lack of randomized clinical trials exists for evaluating gingival displacement products.

Purpose of the Study:

To prospectively evaluate the clinical effectiveness of three gingival displacement techniques.
Compare Racegel cordless, Racegel with a cord, and Racestyptine with a cord.

Main Methods:

A prospective, multicenter, randomized clinical trial involving 88 participants.
Measured lateral and vertical gingival displacement using 3D analysis.
Assessed periodontal indices immediately and 7-14 days post-procedure.

Main Results:

Racestyptine with cord (253 µm) and Racegel with cord (247 µm) achieved significant lateral displacement (>200 µm).
Racegel cordless provided 207 µm of lateral displacement, not statistically significant.
No significant differences in vertical displacement were observed among techniques.

Conclusions:

Racestyptine and Racegel (with or without cord) effectively open the gingival sulcus for prosthodontic impressions.
All tested methods demonstrated an astringent effect and no immediate or short-term periodontal damage.
The techniques meet clinical requirements for lateral gingival displacement.