Characterization of the calcium-fluoroaluminosilicate glass prepared by a non-hydrolytic sol-gel route for future dental application as glass ionomer cement

Abstract

Glass ionomer cements are widely employed in dentistry due to their physical, biological and mainly anti-caries properties. Glass ionomers consist of an aluminosilicate glass matrix modified with other elements, and they contain large quantities of fluorine. In this study, we report on the preparation of calcium-fluoroaluminosilicate glasses by a nonhydrolytic sol-gel route as an alternative approach to obtaining alumina-silica matrices. The glass powders were prepared via the non-hydrolytic sol-gel method, by mixing AlCl 3 , SiCl 4 , CaF 2 , AlF 3 , NaF, and AlPO 4 . The powders were studied by thermal analysis (TG/DTA/DSC), photoluminescence (PL), nuclear magnetic resonance (NMR 27 Al-29 Si), and X ray diffraction (XRD). TG/DTA/DSC analyses revealed a constant mass loss due to structural changes during the heating process, which was confirmed by NMR and PL. A stable aluminosilicate matrix with potential future application as a glass ionomer base was obtained.

Kinetic and potential sputtering of an anorthite‐like glassy thin film

“…Because of its somewhat different stoichiometry, and possibly different surface roughness, the thin film used for the present measurements is characterized interchangeably as “anorthite (II)” or as anorthite‐like (II), while the thin film used for the previous measurements will be referred to as “anorthite (I)” or anorthite‐like (I). For both the earlier [ Hijazi et al ., ] and the present thin films, conventional XRD and GIXRD analysis showed crystallographic signatures only of polycrystalline gold and AT‐cut quartz, but no sharp or even amorphous broadened anorthite lines [ Cestari et al ., ; Le Parc et al ., ]. Therefore, both the earlier and the present thin films are categorized as “glassy.”…”

Preparation of calcium fluoroaluminosilicate glasses containing sodium and phosphorus by the nonhydrolytic sol–gel method

“…3 depicts the thermal analysis of glass A4. The sample underwent an initial mass loss of 33% between 25 and 325 • C, and a total mass loss of 47% up to 1100 • C. The T g observed by DSC and DTA was close to 615 • C; i.e., higher than that of glass A2 (605 • C) and lower than that of A3.3 (620 • C), as expected from the phosphorus concentration [8,11]. Sample A2 has a predominantly amorphous structure.…”

“…The A3.3 material displays an amorphous structure with crystalline phases attributed to fluorapatite (Ca 5 (PO 4 ) 3 OF) and mullite (3Al 2 O 3 2SiO 2 ), according to Gorman and Hill. Sample A4 also presents an amorphous phase and a crystalline phase, which is ascribed to mullite [11,21].…”

“…Eu 3+ has been the most commonly employed and studied rare earth ion because its emission spectrum is easy to interpret. In order to monitor the glassy environment of the materials synthesized in this study, Eu 3+ ions were added to the matrices [11,[22][23][24][25][26][27][28].…”

“…The oxide is then polycondensed, thus forming an inorganic polymer network, nM-O-M → (M-O-M )n. The alkoxide can be added to the reaction or produced in situ during the reaction between the halide and an oxygen donor, such as an alcohol or ether. This method enables the preparation of mixed oxides such as calcium fluoroaluminosilicates containing sodium and phosphorus in an amorphous structure [11][12][13][14][15][16][17][18].…”