Bioactivity of leucite containing glass - ceramics using natural raw materials

Abstract

Glass compositions were carefully prepared, using natural quartz and potassium feldspar as a part of the starting raw materials. The solids were prepared so as to have theoretical stoichiometric leucite and 45S5 Bioglass in different L/Bg weight ratios between 0.43-1.00. Novel bioactive glass-ceramics, containing leucite, sodium calcium silicate and silicorhenanite, confirmed by XRD and FTIR, were obtained. Bioactivity tests were carried out on powdered and sintered disks forms. The immersion time was up to 25 days. Apatite formation on powders was studied by FTIR, and XRD and SEM were used to study bioactivity on disks. The materials developed an apatite layer on their surfaces within 6 days of immersion in simulated body fluid. The glass-ceramic with L/Bg ratio= 0.43 presented an apatite layer on all its surface, not so for the samples with 0.66 and 1.00 ratios, on which such layer was peeled off in most part of their surfaces.

Surface modification after ethanol wet milling: A comparison between pristine glasses produced from natural minerals and analytical grade raw materials

“…The induction of bioactivity on glass-ceramics with dental applications has been achieved through dental glassceramics/bioactive glass composites (eg. 45S5, 58S) [2,3]; as well as through pristine glasses of different compositions, that were calculated in the basis of different theoretical weight ratios of Leucite (KAlSi 2 O 6 ) and Bioglass 45S5 [4], which were also produced using natural minerals.…”

Effects of Incorporating Natural Minerals on Production and Bioactivity of Bioactive Glass Ceramics

“…% in vitreous materials [2]. But, if Al 2 O 3 is incorporated within a crystalline phase in glass ceramics production, it does not interfere with bioactivity [3][4][5]. Both of these minerals often have Fe 2 O 3 and TiO 2 impurities, which can impart color to the final product.…”

“…One way to increase its mechanical strength is through crystallization, transforming it into a glassceramic, which does not affect its bioactivity [7], and incorporating biocompatible phases such as leucite, that is widely used in dental glass-ceramic as a reinforcement phase. It was found that leucite does not influence in glass ceramics bioactivity [5]. This work was intended to study the effect of the use of natural raw materials at all stages of production of glass-ceramics.…”