Crystallization and Ability of Hydroxyapatite Formation in Some Trivalent Oxides Containing Na-Ca-Silicate Glass-Ceramics |
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Authors: | Saad M. Salman Samia N. Salama Hany A. Abo-Mosallam |
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Affiliation: | (1) Glass Research Department, National Research Centre, El-Behoos St. Dokki, Cairo, Egypt |
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Abstract: | The formation of glass-ceramics based on Na2O–CaO-silicates containing P2O5 with minor additives of some trivalent oxides (e.g. La, In, Ga, and Al), has been investigated. Different crystalline phases including sodium-orthosilicate containing lanthanum, or aluminum were formed together with Na2Ca2Si3O9, NaInSi2O6, and Na3Ga2Si3O10. The nature and mechanism of HA formed in the glass-ceramics are considered. In general, the presence of trivalent oxides in the glass-ceramics progressively reduced the ability to form a calcium phosphate layer on the surfaces of the materials. The addition of In2O3 decreased the crystallization of the hydroxyapatite layer. However, in the presence of either Ga2O3 or Al2O3 only the amorphous calcium phosphate layer was formed after the immersion of the crystallized specimens in the SBF solution. |
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