Volume 6, Issue 2 (Journal of Research in Dental & Maxillofacial Sciences Spring 2021)                   J Res Dent Maxillofac Sci 2021, 6(2): 14-21 | Back to browse issues page

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Farnoosh F, Ansari Lari H, Fatemi M. Comparative Study of the Effect of Storage Environment Temperature on the Accuracy of Hygedent and Chromogel Alginate Impression Materials. J Res Dent Maxillofac Sci. 2021; 6 (2) :14-21
URL: http://jrdms.dentaliau.ac.ir/article-1-300-en.html
1- Faculty of Dentistry, Islamic Azad University of Medical Sciences, Tehran, Iran
2- Prosthodontics Dept, Membership of Dental Material Research Center, Faculty of Dentistry, Islamic Azad University of Medical Sciences, Tehran, Iran , homeira2008@yahoo.com
3- Dental Materials Dept, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Abstract:   (643 Views)

Background and Aim: Considering the lack of sufficient and even contradictory studies on the effect of temperature-dependent dimensional changes of alginate before pouring, this study aimed to investigate the effect of storage temperature of Hygedent and Chromogel alginate molds on dimensional stability. 
Materials and Methods: In this in-vitro experimental study, dimensional changes of two types of alginate were investigated indirectly by measuring a type III stone cast. Ninety molds of each alginate were obtained from a metal model and stored at 1±4, 1±25, and 1±40°C. The casting was performed 12 minutes, 1 hour, and 4 hours after impression taking. The molds were incubated with an approximate humidity of 100%. The diameter, width, and height of the gypsum casts were measured by a digital caliper with an accuracy of 0.01 mm. Dimensional changes of two alginates in three separate directions were statistically analyzed by three-way analysis of variance (ANOVA) and post-hoc test due to the significant difference.
Results: There was no statistically significant difference in width changes at different temperatures, but regarding the diameter, there was a significant difference between 40°C Chromogel and 25°C Hygedent. Regarding the height, only 40°C Hygedent showed a significant difference at 4 hours compared to 12 minutes (P=0.000, 0.26, and 0.000, respectively). However, no statistically significant difference was observed in other temperatures and times (P>0.05). In most groups, dimensional changes of all samples were not within the clinical standard range (1%).
Conclusion: It seems that the dimensional stability of Hygedent and Chromogel alginates is affected by storage temperature, pouring time, and type of alginate.

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Type of Study: Case report | Subject: Dental implant

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