![]() These factors include ambient temperature and humidity, pouring time, and type of alginate. To achieve an accurate impression, it is important to be aware of all the factors that may affect the dimensional accuracy of the material. Lack of dimensional stability of alginate may lead to repetition or an increase in operating time and cost. One of the important factors in choosing impression materials, such as alginate, is the level of dimensional changes. Keywords: Alginate, Temperature, Time, Dimensional Stability In most groups, dimensional changes of all samples were not within the clinical standard range (1%).Ĭonclusion: It seems that the dimensional stability of Hygedent and Chromogel alginates is affected by storage temperature, pouring time, and type of alginate. However, no statistically significant difference was observed in other temperatures and times (P>0.05). Regarding the height, only 40☌ Hygedent showed a significant difference at 4 hours compared to 12 minutes (P=0.000, 0.26, and 0.000, respectively). Results: There was no statistically significant difference in width changes at different temperatures, but regarding the diameter, there was a significant difference between 40☌ Chromogel and 25☌ Hygedent. ![]() 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. The diameter, width, and height of the gypsum casts were measured by a digital caliper with an accuracy of 0.01 mm. The molds were incubated with an approximate humidity of 100%. The casting was performed 12 minutes, 1 hour, and 4 hours after impression taking. Ninety molds of each alginate were obtained from a metal model and stored at 1±4, 1☒5, and 1±40☌. 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. 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.
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