Evaluation of the dimensional stability of three irreversible hydrocolloid trademarks
Keywords:Alginates, Dental materials, Dental prosthesis
Objective: This in vitro study aimed to evaluate the influence of seven pouring times on dimensional stability of three brands of irreversible hydrocolloids: Jeltrate Plus (Dentsply Sirona, São Paulo, Brazil), Hydrogum 5 (Zhermack, Badia Polesine, Italy) and CavexColor Change (Cavex, Haarlem, The Netherlands). Material and methods: A standard acrylic model with a flat base and four straight pillars was made: A, B, C and D. In total, 105 impressions were made, 35 from each commercial brand, subdivided into seven groups according to the pouring times: immediately after alginate impression; 30 minutes; 2 hours; 24 hours; 48 hours; 120 hours and 216 hours after alginate impression. Then, the measurements of the distance between the points (measures AB, BC and CD) were performed. A two-way analysis of variance (ANOVA) and Tukey’s post-hoc test (α = 0.05) were used as statistical tests. Results: Dimensional stability was directly affected by the storage time and the alginate brand (p < 0.05). Jeltrate Plus showed increasing dimensional changes after 2 hours of storage. Hydrogum 5 and Cavex Color Change were stable for 120 and 48 hours, respectively. Conclusion: In suitable storage conditions, Hydrogum 5 and Cavex Color Change brands showed greater dimensional stability.
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