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Technologies 2015, 3(2), 58-73; doi:10.3390/technologies3020058

Evaluation of Calcium Fluoroaluminosilicate Based Glass Ionomer Luting Cements Processed Both by Conventional and Microwave Assisted Methods

1
Department of Dental Materials, Manipal College of Dental Sciences, Manipal 576 104, Karnataka, India
2
Department of Chemistry, Shri Madhwa Vadiraja Institute of Technology and Management, Bantakal, Udupi 574 115, Karnataka, India
3
Department of Chemistry, National Institute of Technology, Surathkal 575 205, Mangalore, Karnataka, India
4
Ceramic Technological Institute, BHEL, Corp. R&D, Malleswaram Complex, Bengaluru 560 012, Karnataka, India
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Manoj Gupta
Received: 19 December 2014 / Revised: 7 March 2015 / Accepted: 9 March 2015 / Published: 25 March 2015
(This article belongs to the Special Issue Microwave Energy Applications)
View Full-Text   |   Download PDF [4051 KB, uploaded 25 March 2015]   |  

Abstract

Calcium fluoroaluminosilicate glasses (CAS) are used in the formulation of glass ionomer cements for dental applications. However, the cements obtained from CAS glasses were found to be radiolucent. In this study, the influence of substituting Zn, Sr and Mg for Ca of CAS glasses was investigated with respect to the structure and setting characteristics, mechanical properties, and radiopacity of cements designed for luting applications. Three glass compositions based on substitution of Zn, Sr and Mg for Ca at 1:1 molar ratio was synthesized. They were coded as the G 021 (Ca: Zn), G 022 (Ca: Sr), G 023 (Ca: Mg). G 021 and G 022 glasses were processed by conventional melt quench route, whereas G 023 was processed by microwave melt–quench route. Each glass was then mixed with Fuji Type I GIC liquid in order to evaluate the properties of novel cements at different powder/liquid ratios. X-ray diffraction and Fourier Transform-Infrared spectroscopy analysis confirmed the structure of the processed glasses. The average particle size of the processed glass powders was within specification limits for luting applications (<15 μm). The substitution of Zn, Sr and Mg for Ca at 1:1 molar ratio increased the reactivity of the respective glasses. This has been reflected in their respective setting characteristics and mechanical properties. The optimal combination of setting time, strength and radiopacity for the cements examined here was shown by G 022 cements. The microwave melting can be utilized for processing ionomer glasses as it did not alter the structure and properties of G 023 cement. View Full-Text
Keywords: Calcium fluoroaluminosilicate glass (CAS); Glass Ionomer cement (GIC); microwave melt quench route; Powder/liquid ratio [P/L ratio]; Initial setting time (working time); Final setting time; compressive strength; radiopacity; American Dental Association (ADA) Calcium fluoroaluminosilicate glass (CAS); Glass Ionomer cement (GIC); microwave melt quench route; Powder/liquid ratio [P/L ratio]; Initial setting time (working time); Final setting time; compressive strength; radiopacity; American Dental Association (ADA)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

P., N.U.; Srinivasan, K.K.; Adhikari, A.V.; Satapathy, L.N. Evaluation of Calcium Fluoroaluminosilicate Based Glass Ionomer Luting Cements Processed Both by Conventional and Microwave Assisted Methods. Technologies 2015, 3, 58-73.

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