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.
Highlights
The concept of glass-ionomer cements (GICs) was introduced to the dental profession in the early 1970s by Wilson and Kent
Glass-ionomer cements can be described as a polymer-based dental composite resulting from a series of acid-base reactions occurring between aqueous solutions of poly, e.g., poly, and calcium-fluoro-aluminosilicate glasses [5]
In accordance with the earlier reports that Sr and Si peaks can merge into a single peak, separate Sr peak was not visible in the energy dispersive X-ray analysis (EDX) spectra [20]
Summary
The concept of glass-ionomer cements (GICs) was introduced to the dental profession in the early 1970s by Wilson and Kent. The production of GICs stemmed from a desire to combine the beneficial aspects of silicate cements (Strength, translucency and fluoride release) with those of polycarboxylate cements (adhesiveness and biocompatibility). Glass-ionomer cements can be described as a polymer-based dental composite resulting from a series of acid-base reactions occurring between aqueous solutions of poly (alkenoic acids), e.g., poly (acrylic acid), and calcium-fluoro-aluminosilicate glasses [5]. The metal cations serve to crosslink the polyacrylate chains resulting in a hard composite material. The resulting cements consist of residual glass particles with a surrounding siliceous layer embedded in a polysalt matrix [2,4,6]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
