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:: Volume 32, Issue 3 And 4 (10-2020) ::
J Islam Dent Assoc Iran 2020, 32(3 And 4): 43-49 Back to browse issues page
Effects of Water/Powder Ratio of Irreversible Hydrocolloid on Dimensional Stability of Impressions
Ehsan Ghasemi1, Behnaz Ebadian *2, Alireza Asadi3, Nafiseh Ghasemi3
1- Assistant Professor, Dental Materials Research Center and Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
2- Professor, Dental Implant Research Center and Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran , ebadian@dnt.mui.ac.ir
3- Dentist, Private Office, Isfahan, Iran
Abstract:   (395 Views)
Background and Aim: Water/powder ratio is effective on some properties of irreversible hydrocolloid impression materials. This study aimed to determine the ef-fects of water/powder ratio of irreversible hydrocolloid impression materials on di-mensional stability of impressions.
Materials and Methods: In this in vitro experimental study, a metal model with two abutments as anchoring support for a three-unit dental bridge was used. Sixty alginate impressions were made with different water/powder ratios (control group and test group with 50% extra water). The impressions were made by acrylic trays. Alginate impressions were poured with dental stone after 15, 60 and 240 min of removal from the model. The diagonals and heights of the small and large dies as well as the outer space between the two dies were measured trice using a digital caliper with 0.01 mm accuracy, and the mean values were reported. The obtained dimensions were com-pared with each other and with the model. Data were analyzed by one-way ANOVA, one-sample t-test, and independent samples t-test (α=0.05).
Results: In the majority of dimensions in both the control and test groups, there was a significant difference in comparison with the metal model. The mean dimensions of casts did not show any significant difference between the two groups after 240 min (P>0.1).
Conclusion: Increasing the water added to alginate powder by 50% affected the di-mensional stability of the resulted casts. The time interval before pouring the cast had a significant effect on dimensional accuracy of the casts.
Keywords: Dental Impression Materials, Colloids, Alginates
Full-Text [PDF 706 kb]   (131 Downloads)    
Type of Study: Orginal | Subject: Porosthodontics
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Ghasemi E, Ebadian B, Asadi A, Ghasemi N. Effects of Water/Powder Ratio of Irreversible Hydrocolloid on Dimensional Stability of Impressions. J Islam Dent Assoc Iran. 2020; 32 (3 and 4) :43-49
URL: http://jidai.ir/article-1-2111-en.html


Volume 32, Issue 3 And 4 (10-2020) Back to browse issues page
Journal of Islamic Dental Association of Iran

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