Citation Information :
Gajbhiye V, Banerjee R, Tekale R, Jaiswal PR, Kumbhare R. Randomized Clinical Trial for Evaluation of Efficacy of a Tissue-displacing Impression System in Comparison with Conventionally Used Gingival Displacement Materials in Young Adult Population. Int J Prosthodont Restor Dent 2023; 13 (3):163-169.
Purpose: The purpose of the study was to comparatively evaluate these new gingival displacement materials for their efficacy when compared with the conventional chemomechanical gingival displacement method.
Materials and methods: This randomized control trial was carried out on 25 individuals according to the inclusion and exclusion criteria for gingival displacement using a retraction cord impregnated with aluminum chloride, ExpaSyl, and NoCord vinyl polysiloxane (VPS) impression system using Latin block design to evaluate the gingival displacement produced by three different tissue displacing materials on a right central incisor. Impressions were poured into the die stone. Casts were retrieved, and sections were made using a die cutter. Each slice thus obtained was evaluated under an optical microscope and transferred to the image analyzer to measure the amount of gingival retraction. The recorded values were statistically evaluated using the one-way analysis of variance (ANOVA) test, followed by the Tukey post hoc test for multiple comparisons.
Results: The amount of mean gingival displacement produced by retraction cord impregnated with astringent solution was 1.42 ± 0.32 µm, by ExpaSyl retraction paste was 1.40 ± 0.11 µm, and that by NoCord VPS impression was 0.62 ± 0.12 µm when subjected to one-way ANOVA which showed highly statistically significant difference (p = 0.001 )among all the three groups with respect to gingival displacement. NoCord Impression system produced optimum tissue displacement as compared to the other two techniques.
Conclusion: The retraction cord produced the maximum tissue displacement, followed by ExpaSyl, and the least displacement was caused by NoCord, although all displacement methods compared produced the optimum displacement required for impression making.
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