Setting Time and Consistency of three Kinds of Irreversible Hydrocolloid Impression Materials

Abstract

Statement of problem: Taking impression plays an important role in prosthodontic treatments. Alginate impression materials are very common in this regard. With due attention to the importance of setting time and consistency of impression materials, researches for comparison the properties of different impression materials are necessary.Aim: This study was conducted to investigate the setting time and consistency of two Iranian alginates (Regular Iralgin and Super Iralgin) in comparison with one imported brand, Bayer alginate using ADA (No.18) and ISO (1563) specification.Materials and method: In this in vitro study, 51 samples (17 samples of each alginate, Bayer, Regular Iralgin and Super Iralgin) were prepared. Setting time and consistency of these materials were compared according to Iranian standard Institute, specification 1563. To analysis the data, t-test and ANOVA were used.Results: Mean of consistency and seting time from maximum to minimum was including Bayer, Regular Iralgin and Super Iralgin. According to the result of this experiment, the three materials showed acceptable setting time and consistency according to Iranian Standard Specifications. ANOVA analysis showed no significant differences in consistency among these materials (p>0.05) whereas there were significant differences in setting time between Bayer alginate and Iranian brands (p<0.05).Conclusion: The three impression materials used in this study showed acceptable setting time and consistency. There was significant difference in setting time among them, which could be related to the composition of these materials. More studies are needed to be conducted on other properties of these materials.Key words: Consistency, Working time, Setting time, Iirreversible hydrocolloid, Impression material