title: Bioactive composite bone cement based on α-tricalcium phosphate/tricalcium silicate.
abstract: Silicon compounds are known as bioactive materials that are able to bond to the living bone tissue by inducing an osteogenic response through the stimulation and activation of osteoblasts. To improve the bioactive and mechanical properties of an α-Ca(3)PO(4)-based cement, the effects of the addition of Ca(3 SiO(5) (C(3)S) on physical, chemical, mechanical, and biological properties after soaking in simulated body fluid (SBF) were studied. The morphological and structural changes of the material during immersion were analyzed by X-ray diffraction and scanning electron microscopy. The results showed that it is possible to increase the compressive strength of the cement by adding 5% of C(3)S. Higher C(3)S contents enhance bioactivity and biocompatibility by the formation of a dense and homogeneous hydroxyapatite layer within 7 days; however, compressive strength decreases drastically as a consequence of delayed hydrolysis of α-Ca(3)(PO(4) (2). An increment in setting times and degradation rate of composites containing C(3)S was also observed.
authors: Escola de Engenharia, Departamento de Materiais, Universidade Federal do Rio Grande do Sul, Porto Alegre (RS), Brasil. loreley.morejon@ufrgs.br
authors: Loreley
authors: L
authors: Morejón-Alonso
authors: Oscar Jacinto Bareiro
authors: OJ
authors: Ferreira
authors: Raúl Garcia
authors: RG
authors: Carrodeguas
authors: Luis Alberto
authors: LA
authors: dos Santos
mesh_terms: D001843:Bone Cements / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D002130:Calcium Phosphates / Q000737:chemistry*; D002478:Cells, Cultured; D019245:Compressive Strength; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010006:Osteoblasts / Q000166:cytology / Q000378:metabolism*; D017640:Silicates / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D001843:Bone Cements; D017610:Calcium Compounds; D002130:Calcium Phosphates; D017640:Silicates; C485828:alpha-tricalcium phosphate; C506393:tricalcium silicate