Thermal and physical characterisation of apatite/wollastonite bioactive glass–ceramics

Identification of the wollastonite phase in sintered 45S5 bioglass and its effect on in vitro bioactivity

“…This indicates that the formation of wollastonite does not deteriorate the bioactivity of sintered bioglass ceramic. This SBF immersion result is supported by the following two facts: (1) wollastonite is one of two major crystalline phases of A/W glass ceramic that has excellent biocompatibility and bioactivity [29]; and (2) wollastonite ceramic itself has good bioactivity and can be regarded as a potential candidate for artificial bone [30].…”

Incorporation of B2O3 in CaO-SiO2-P2O5 bioactive glass system for improving strength of low-temperature co-fired porous glass ceramics

“…It is accepted that the bioactive behavior was related with the initial composition of the BG, the phase composition after thermal treatment and sintering process [12,13]. A well known SiO 2 -CaO-P 2 O 5 -MgO system composed of crystalline wollastonite, apatite and the residual glassy phase (Cerabone®-AW) has been developed with improved mechanical strength, whereas the over-high sintering temperature (>1100°C) leads to apatite production and undesired low degradability [13].…”

“…It is accepted that the bioactive behavior was related with the initial composition of the BG, the phase composition after thermal treatment and sintering process [12,13]. A well known SiO 2 -CaO-P 2 O 5 -MgO system composed of crystalline wollastonite, apatite and the residual glassy phase (Cerabone®-AW) has been developed with improved mechanical strength, whereas the over-high sintering temperature (>1100°C) leads to apatite production and undesired low degradability [13]. The liquidus temperatures of most phosphorus-, and silica-rich phosphosilicate BGs are higher than 1000°C, and it therefore suggests that the crystalline apatite in sintered BGCs decreases the material bioactivity, mechanical strength and dissolution rate [10,[13][14][15].…”

“…A well known SiO 2 -CaO-P 2 O 5 -MgO system composed of crystalline wollastonite, apatite and the residual glassy phase (Cerabone®-AW) has been developed with improved mechanical strength, whereas the over-high sintering temperature (>1100°C) leads to apatite production and undesired low degradability [13]. The liquidus temperatures of most phosphorus-, and silica-rich phosphosilicate BGs are higher than 1000°C, and it therefore suggests that the crystalline apatite in sintered BGCs decreases the material bioactivity, mechanical strength and dissolution rate [10,[13][14][15]. To fabricate load-bearing BGCs it is necessary to sintering the BGs at high temperature to full density while maintaining porosity which is required for nutrient diffusion and tissue ingrowth.…”

Synthesis and characterization of spherical amorphous alumo-silicate nanoparticles using RF thermal plasma method

“…Powders containing spherical silica are employed in a broad range of applications (electrical, magnetic and structural), and particularly in the processing of plastics (production of nanocomposites) and in adsorptive processes and catalysis [15,16]. Glass-ceramic materials consisting of silica or alumina, which can be used in biomedical purposes, for orthopaedic surgery and implantation, are extremely desirable [17][18][19][20]. The main aim of this work was to synthesise and characterise spherical alumina-silicate nanoceramics using the RF thermal plasma technique and to investigate the influence of the SiO2 particle size on the microstructural features of the final products.…”