World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

A Comparison of Viscoelastic Properties of Three Root Canal Sealers., Vol. 10

By Khedmat, Sedigheh

Click here to view

Book Id: WPLBN0004442679
Format Type: PDF eBook :
File Size:
Reproduction Date: 2013-03-31

Title: A Comparison of Viscoelastic Properties of Three Root Canal Sealers., Vol. 10  
Author: Khedmat, Sedigheh
Volume: Vol. 10
Language: English
Subject: புதுமைப்பித்தன், சிறுகதை
Collections:
Historic
Publication Date:
2013-03-31
Publisher:

Citation

APA MLA Chicago

Malihe, P. (2013-03-31). A Comparison of Viscoelastic Properties of Three Root Canal Sealers., Vol. 10. Retrieved from http://www.ebooklibrary.org/


Description
Description: This article is from Journal of Dentistry (Tehran, Iran), volume 10.

Abstract

Objective:: Handling of endodontic sealers is greatly dependent on their elasticity and flow ability. We compared the viscoelastic properties of three root canal sealers. Materials and Methods:: AH Plus (Dentsply, De Trey, Konstanz, Germany), Endofill (Dentsply Hero, Petrópolis, Rio de Janeiro, Brazil) and AH26 (Dentsply, De Trey, Konstanz, Germany) were mixed according to the manufacturers’ instructions. The resulted pastes were placed on the plate of a rheometer (MCR 300, Anton-Paar, Graz, Austria). The experiments were performed at 25°C and 37°C. Viscoelastic properties of the sealers including loss modulus (G″), storage modulus (G′) and complex viscosity (η*) were studied using dynamic oscillatory shear tests. The shear module versus frequency (from 0.01 to 100 S−1) curves were gained using frequency deformation sweep test. Three samples of each material were examined at each temperature. The mean of these three measurements were recorded. Results:: The storage modulus of AH plus was higher than its loss modulus at two temperatures. Endofill exhibited a crossover region in which the storage modulus crosses the loss modulus in both temperatures. At 25°C the loss modulus of AH26 was higher than the storage modulus (G″>G′). In contrast, at 37°C G′ was greater than G″ (G′>G″). Both shear modules of AH Plus and Endofill decreased as the temperature raised from 25°C to 37°C. On the contrary, the loss modulus and storage modulus of AH26 increased at 37°C. Conclusion:: In both test temperatures, AH Plus behaved like viscoelastic solids and Endofill exhibited a gel-like viscoelastic behavior. AH26 at 25°C behaved like liquids, while at 37°C it was an elastic solid-like material.


 
 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.