Hydroxyapatite—alumina composites and bone-bonding

Li, J.; Fartash, B.; Hermansson, Leif

doi:10.1016/0142-9612(95)98860-g

Cited by 166 publications

(100 citation statements)

References 8 publications

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“…For example, HA was combined with Bioglass Ò (Novabone Products, Alachua, FL) [748,749] and with other glasses [750] to form glassceramics biocomposites. Other reinforcement materials for calcium orthophosphates are differentiated by either shape of the fillers, namely, particles [751,752], platelets [753,754], whiskers [484,755,756], fibers [757][758][759], or their chemical composition: zirconia and/or PSZ [250, 743-746, 755, 760-793], alumina [250,751,754,[793][794][795][796][797][798][799][800][801][802], titania [307,747,752,[803][804][805][806][807][808][809][810][811][812][813][814][815][816][817], other oxides [818-821], silica and/or glasses …”

Section: Biocomposites With Glasses Inorganic Materials and Metalsmentioning

confidence: 99%

Calcium orthophosphate-based biocomposites and hybrid biomaterials

Dorozhkin¹

2009

J Mater Sci

285

146

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Section: Biocomposites With Glasses Inorganic Materials and Metalsmentioning

confidence: 99%

Calcium orthophosphate-based biocomposites and hybrid biomaterials

Dorozhkin¹

2009

J Mater Sci

285

146

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“…5,6 An earlier report explored ZrO2-SiO2 binary oxides as a ceramic-glass composite for hard tissue biomaterial applications. 7 This system shows two important features: the preservation of a mechanically stable t-ZrO2 phase coexisting with amorphous SiO2 8 and the presence of glassy SiO2 in the range of 40-60 wt.…”

Section: Introductionmentioning

confidence: 99%

Tetragonal to Cubic Transformation of SiO₂-Stabilized ZrO₂ Polymorph through Dysprosium Substitutions

2017

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Partially stabilized tetragonal zirconia (t-ZrO2) is of particular interest for hard tissue replacements. Ageing related failures of the ceramic associated with the gradual transformation from t-ZrO2 to m-ZrO2 (monoclinic zirconia) can lead to its premature removal from the implant site. In addition, monitoring the satisfactory performance of the implant throughout its life span without invasive techniques is a challenging task. The magnetic resonance imaging (MRI) contrast ability of dysprosium (Dy 3+ ) is well established. To this aim, varied levels of Dy 3+ additions in the ZrO2-SiO2 binary oxide system have been explored. The results indicate the effective role of Dy 3+ in the formation of thermally and mechanically stable c-ZrO2 (cubic zirconia) phase at higher temperatures. The presence of SiO2 influenced the t-ZrO2 stabilization whereas Dy 3+ tends to occupy the ZrO2 lattice sites to induce c-ZrO2 transition. Magnetic and magnetic resonance imaging (MRI) tests displayed the commendable contrast ability of Dy 3+ stabilized ZrO2-SiO2 binary systems. Nanoindentation results demonstrate a remarkable enhancement on the mechanical properties.Keywords: Silica; Zirconia; Dysprosium; Stabilization; Mechanical. 3 IntroductionThe demand for bone implants is growing rapidly due to the increasing incidents of trauma and age related defects caused by osteoporosis. In view of the above potential advantages of Dy 3+ as an addition to ZrO2-SiO2 binary oxides in terms of increased t-ZrO2 stability and enhance MRI image contrast, we present a study of the influence of Dy 3+ on the ZrO2-SiO2 binary oxide system through in-situ sol-gel synthesis, followed by a systematic analysis of the resulting phase composition and structure, mechanical strength and imaging contrast features. Materials and Methods Powder synthesisThe synthesis of Dy 3+ doped ZrO2-SiO2 (DZS) binary oxides was achieved through the sol-gel method. Analytical grade Dy(NO3)3.H2O, ZrOCl2·8H2O and (C2H5)4OSi (TEOS), all procured from Sigma-Aldrich, India, were taken as precursors for the synthesis. The molar concentrations of ZrOCl2·8H2O and (C2H5)4OSi were maintained at a constant ratio of 1: 1 throughout the 5 synthesis whereas the Dy(NO3)3 additions were adjusted to obtain a wide range of compositions.Additionally, a pure ZrO2-SiO2 binary with 1:1 molar ratio was prepared for comparative purposes. The molar concentrations of the different precursors and the respective sample codes are reported in Table 1; the same codes will be used throughout the manuscript. The synthetic procedure is briefly explained as follows. Previously prepared Dy(NO3)3 stock solution as detailed in Table 1 was added to the ZrOCl2 solution under vigorous stirring. The required amount of ethanol was added to this continuously stirred mixture at an operating temperature of 80 °C for 30 minutes. This was followed by the addition of 1 M TEOS to the solution under constant stirring conditions and finally 0.1 M of HNO3 was added to this mixture as a catalyst. The homogeneous solut...

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“…In the sintered nanocomposites, no alumina peaks were detected up to the sintering temperature of 1200'C. Moreover, third phases such as AIPO 4 were observed above I 100°C [8]. Hap in The HAp-A1 2 0 3 nanocomposite samples showed the percentage theoretical density in the range of 63-79% when sintered in the temperature range 10001-1200'C for 1 hour.…”

Section: Results and Discussion (A)mentioning

confidence: 97%

“…Among those, alumina is one of the most widely investigated reinforcement material for HAp composites. However, very few reports are available in the literature on hydroxyapatite based nanocomposites [4][5][6]. Many questions such as the effect of particle size on the phase stability of HAp in composites and change in mechanical properties such as toughness remain unanswered.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Sintering and Microstructural Characterization of Nanocrystalline Hydroxyapatite Composites

et al. 2004

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Nanocrystalline hydroxyapatite (HAp) exhibits better bioactivity and biocompatibility with enhanced mechanical properties compared to the microcrystalline counterpart. In the present work, nanocrystalline hydroxyapatite was synthesized by wet chemical method. Sintering was carried out with nanocrystalline alumina as additive, the content of alumina being varied from 10 to 30 wt% in the composite. For 20 and 30 wt % A1 2 0 3 , hydroxyapatite decomposed into tricalcium phosphate (TCP) above the sintering temperature of 1 100C. The fracture toughness of nano HAp-nano A1 2 0 3 composite is anisotropic in nature and reached a maximum value of 6.9 MPa m 12 .

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Hydroxyapatite—alumina composites and bone-bonding

Cited by 166 publications

References 8 publications

Calcium orthophosphate-based biocomposites and hybrid biomaterials

Calcium orthophosphate-based biocomposites and hybrid biomaterials

Tetragonal to Cubic Transformation of SiO₂-Stabilized ZrO₂ Polymorph through Dysprosium Substitutions

Synthesis, Sintering and Microstructural Characterization of Nanocrystalline Hydroxyapatite Composites

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Hydroxyapatite—alumina composites and bone-bonding

Cited by 166 publications

References 8 publications

Calcium orthophosphate-based biocomposites and hybrid biomaterials

Calcium orthophosphate-based biocomposites and hybrid biomaterials

Tetragonal to Cubic Transformation of SiO2-Stabilized ZrO2 Polymorph through Dysprosium Substitutions

Synthesis, Sintering and Microstructural Characterization of Nanocrystalline Hydroxyapatite Composites

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Tetragonal to Cubic Transformation of SiO₂-Stabilized ZrO₂ Polymorph through Dysprosium Substitutions