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:: Volume 34, Issue 1 (winter 2016) ::
J Dent Sch GYEAR__, 34(1): 28-33 Back to browse issues page
Evaluation of tear strength of two types of Iralgin and its comparison with similar alginate impression material
A. Fayaz , A. Noori *
Assistant Professor , nooripros@sbmu.ac.ir
Abstract:   (1226 Views)

Objective: Among the various impression materials, for alginate tear strength is probably more
important than the compressive strength. The tear strength is important when an impression involves
a mechanical undercut and/or lacks bulk strength to resist tearing. This study evaluated tear strength
of Iralgin and compared it with tear strength of Alginoplast.
Methods: In this invitro experimental study A mold was made with 100mm×20mm×1mm
dimensions and a longitudinal prominence in 0.3 mm depth. Twenty–seven specimens (9 Super
Iralgin, 9 Pocket Iralgin, and 9 Alginoplast) were selected non–randomizedly. Each specimen
prepared corresponding to manufacturer and injected into the mold. And the mold was placed under
press. After removing the mold from press, every specimen formed as a trouser-shaped specimen.
The specimen was pulled in tensile machine with 50 mm/min speed. The data of specimens in
different groups were statistically analyzed using one-way ANOVA, Kolmogorov-
Smirnov, and Levene's tests.
Results: Mean of tear strength in first specimen (Super Iralgin), second specimen (Pocket Iralgin),
and third specimen (Alginoplast) were 640±38 grf/cm², 500 ±20grf/cm², and 1100±27 grf/cm²
respectively. According to ANOVA test, the mean of tear strength was not equal in three specimens
(p<0.01). According to LSD Multiple Comparison, the first and second specimens were same in tear
strength, whereas the third specimen was different from the two former (p<0.05 and p<0.01).
Conclusion: Super Iralgin and pocket Iralgin were the same in tear strength. Alginoplast was
significantly higher than super and pocket Iralgin in tear strength.

Keywords: Dental, Impressions, Materials, Standards, Tensile strength.
Full-Text [PDF 329 kb]   (402 Downloads)    
Type of Study: Original Article | Subject: Special
Received: 2015/04/21 | Accepted: 2016/02/24
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Fayaz A, Noori A. Evaluation of tear strength of two types of Iralgin and its comparison with similar alginate impression material. J Dent Sch. 2016; 34 (1) :28-33
URL: http://jds.sbmu.ac.ir/article-1-1474-en.html
Volume 34, Issue 1 (winter 2016) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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