Evaluation of controlled crystallization on mechanical properties of phosphate glasses

Reference Presenter Authors
02-088 Denise Stolle da Luz Weiss Weiss, D.S.(PUC/PR); Soares Júnior, P.C.(Pontifícia Universidade Católica do Paraná); Buchner, S.(Universidade Federal do Rio Grande do Sul); Santos, L.S.(Pontifícia Universidade Católica do Paraná); The development of biomaterials, which promote the repair of damaged living tissues aiming a rapid restoration of their physiological functions, has been object of intense and growing investigation worldwide. Among ceramic biomaterials, bioglasses present excellent clinical results in many dental and orthopedic applications. Silicate based bioglasses are usually used in long-term applications, since it has a low dissolution rate, while calcium phosphate-based bioglass (PBG) without silica has been noted for its high dissolution capacity, widening the field of application. However, PBG presents low mechanical strength and fracture toughness, which prevents it uses in regions where loads are required. Aiming to overcome the mechanical limitations of PBG, the bioactive glass-ceramic is developed as a result of controlled crystallization of vitreous materials. By controlling the crystalline phases, it is possible to improve the mechanical properties of the original glass. The aim of this work is to analyze the effect of controlled crystallization on the mechanical properties of strontium calcium phosphate-based glasses with addition of titanium and / or magnesium oxides. Our results showed that the obtained glass-ceramic have increased values of hardness, elastic modulus, and fracture toughness.
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