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  • 1
    Electronic Resource
    Electronic Resource
    Composition Optimization of Zirconia Toughened Alumina for Dental Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1369-1372 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The aim of this study was to optimize sintering aids and processing parameters forzirconia toughened alumina (ZTA) nano-ceramics with optimal properties as dental ceramics.Additive agents (TiO2, MgO, SiO2), dry pressing forces and sintering temperatures are veryimportant for preparation of structural ceramics. In the present study, density and Vickers hardnessmeasurement, SEM, and XRD analysis were employed to investigate the effects of these on thefinal products. The relevant results showed that higher pressing force led to an increase in thedensity and Vickers hardness of the sintered ceramics. Among the four groups of sintered nanoceramicswith different ratios of alumina and zirconia, and combinations of additive agents, the bestdensification was achieved in the sample from Group 2# containing 1.05wt% MgO after sintered at1450ºC, as indicated by SEM observation. XRD analysis confirmed the formation of MgAl2O4 as anintermediate compound. The existence of TiO2 in the additive agents was in favor of the acquisitionof high densification. The measured values for the density and Vickers hardness indicated that thesintered ZTA nano-ceramics would be a potential material for dental prosthetic applications
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1369.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Optimization of Experimental Conditions for Synthesis of Nanohydroxyapatite/Collagen Composites in Situ (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 45-48 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: L9 (34) orthogonal array design was employed to optimize experimental conditions forthe preparation of the composite using in situ synthesis method and to analyze the relationshipsbetween experimental parameters and mechanical property of the composites. Bending strength ofthe composite was considered as a target property of the composites. Hydroxyapatite content in thecomposite, synthesis temperature and pH were chosen as main parameters. As a result of this study,bending strength of the composite appeared in peak with the increase of the hydroxyapatite contentof the composites and synthesis pH, while with the increase of temperature, bending strengthdecreased. Optimum experimental conditions for the synthesis of the composites with higherbending strength were determined. The bending strength of the composites was 90 MPa at theoptimal synthesis conditions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.45.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of Hydroxyapatite in Polymeric Solutions for Organic-Inorganic Nanocomposites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 427-430 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Synthesis of hydroxyapatite (HA) in organic solutions has received extensive attention inrecent years with an attempt to obtain HA of a nanometer level. In this preliminary study, wedemonstrated that organic-HA nanocomposites could also be achieved with one step method via insitu mineralization and subsequent crosslinking of organic species. This design was realizedthrough in situ synthesis of hydroxyapatite in poly(vinyl alcohol) and acrylic acid aqueous solutionas an organic template. The aforementioned organic-inorganic nanocomposites were analyzed byusing X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electrical microscopy,thermal analysis. The comparative structural measurements were also conducted with thesynthesized HA with absence of the organic template. The results indicated that the existence oforganic species effectively inhibits the growth of calcium phosphate and that relatively pure HA canbe obtained in sintered composite products. The present study provides a direct and versatile routefor fabrication of nanocomposite biomaterials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.427.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Dehydration Methods on Mechanical Strength of Nanohydroxyapatite/Collagen Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 349-352 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Hydroxyapatite/collagen composites were prepared in-situ synthesis. The compositeswere finally achieved by dehydration including air-drying and freeze-drying methods. FTIR, XPSand DSC were employed to investigate the composites dehydrated by two methods. The air-driedcomposites had better mechanical properties than those of the composites dried by freeze drying.Air-drying of the composite induced more bond formation and crosslink between collagen fibersand HA crystals compared with freeze-drying of the composite, as indicated by the shifting ofamide A and I bands to the lower wavenumber and by the changes in the binding energy of O1s,Ca2p, and P2p, leading to the increase of the peak temperature of the composites. Collagencrosslink and bond formation in the air-dried composites were key factors to increase the bendingstrength of the composites. The results of this study confirm that in situ synthesis and air-drymethod are effective ways to obtain nanoHA/COL composites with high mechanical properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.349.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Investigation of a Collagen-Chitosan-Hydroxyapatite System for Novel Bone Substitutes (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 415-418 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Collagen (Col) and chitosan (Chi) are both natural polymers and have received extensiveinvestigation in recent years in the field of tissue engineering, but there are few reports on theintroduction of hydroxyapatite (HA) into the Col-Ch system. In this study, based on the miscibilityof these two polymers under proper condition, hydroxyapatite (HA) was synthesis in the Col-Chisystem by in-situ co-precipitate method to give rise to a novel nanocomposite. The structuralcharacterization of such Col-Ch-HA nano-materials was carried out by using FT-IR, XRD, SEMand TGA analyses with main components and Col-Chi samples used for comparison. It was foundthat there exist interactions between Col and Chi molecules. The nucleation and growth of inorganicphase occurs in the Col-Chi system and final products are uniform dispersion of nano-sized HA inthe Col-Chi network without obvious phase separation. This novel nanocomposite would be apromising material for bone tissue engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.415.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Development of Poly(Vinyl Alcohol)-Collagen-Hydroxyapatite Nanohybrids for Tissue Grafting (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 329-332 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Poly(vinyl alcohol) (PVA) was introduced during in situ synthesis of hydroxyapatite (HA)in neutral collagen (COL) solution and final PVA-COL-HA nanohybrids were achieved viasequential steps including gelation by fibrillogenesis, freezing-thawing physical crosslinking,removal of unreacted residues and dehydration. This method is expected to endow the pure PVAwith good bioactivity and meanwhile the presence of elastic PVA would improve the properties ofCOL-HA composites. The phase, microstructure and possible molecular interactions of theachieved PVA-COL-HA nanohybrids were analyzed by using X-ray diffraction, Fourier transforminfra-red spectroscopy and scanning electron microscopy. The results indicate that the inorganicphase is poorly crystallized apatite with a nanometer size due to the confinement of organicmacromolecules which forms a network structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.329.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation of Nano-Ceramic Composite as Dental Prosthetic Material (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 645-648 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Zirconia toughened alumina (ZTA) nano-ceramic composite has excellent mechanicalproperties. Preparation of ZTA was conducted in the present study with an attempt to use as dentalceramics. On the basis of the study on the effect of the die pressing forces on the density andVickers hardness of the sintered ZTA, additive aids TiO2, MgO, SiO2 and CaO were introduced inorder to reduce the sintering temperature of ZTA nano-ceramic composite with good densification.Scanning electron microscopy was employed to evaluate the microstructural morphology. Phasecomposition was confirmed by using X-ray diffraction. Thermal analysis was further used to studythe structural change. The results indicated that the ZTA product sintered at 1450°C had dense anduniform microstructure due to the combinative effect of additive aids, including the formation of anintermediate compound. This study suggested that such ZTA nano-ceramics had potentialapplications as dental prosthetic materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.645.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation of Nano-Hydroxyapatite/Poly(D,L-Lactide) Composite and Its Degradation in Femora of Rabbits (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 288-289 (June 2005), p. 203-206 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: With the outstanding biocompatibility of hydroxyapatite (HA) and biodegradation ofpoly(D,L)lactide(PDLLA), and the expected good bio-mechanical compatibility, nano-HA / PDLLA (n-HA/PDLLA)composite has been paid great interests in hard tissue repair. One of the key factors affecting the potential of the composite is the degradation of the composite. That is what the mechanism of degradation in the composite is and if the degradation of the materials would induce the crack of the composite or a porous structure facile for tissue ingrowth would be formed. In this study, an n-HA/ PDLLA composite containing about 40% n-HA (wt%) was prepared and the degradation of the composite in bony tissue of rabbits and tissue response were studied by implanting composite rods and control HA rods into the femora of 16 New Zealand rabbits. After definite intervals, the histological analysis was completed by light microscopy and the degradation behavior was observed by scanning electron microscopy. The results suggested that a nano-HA/PDLLA composite was obtained and the materials showed good biocompatibility andosteoconductivity. The substantial degradation of the composite occurred at 8 weeks in vivo. After a longer period of implantation, the further degradation of the composite led to the formation of interconnected microporous and macroporous structure in the materials that might facilitate the tissue ingrowth in the composite
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.288-289.203.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    The Effect of Post-Treatment on the Mechanical Behavior of Plasma Sprayed HA Coating (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 337-340 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Plasma-sprayed hydroxyapatite coating on metal substrate has been prepared, two kinds of post-treatment methods have been used: (1) Heating in air at 650°C for 30 min, (2) Heating in water vapor at 125°C, 0.15Mpa for 6 hours. XRD showed that the nanocrystals of HA coating increased after water vapor treated. The interfacial tensiles strength between HA and the substrate were 45.0±1.82MPa, 39.1±1.27MPa and 30.3±1.61MPa for as-received coatings, water vaportreated coatings and heated in air coatings respectively. After 3 months implant in dogs limbs, the push-out strength between implants and bone were 11.27±2.71 MPa, 11.63±3.11MPa, 23.92± 2.01MPa and 18.8±1.82 MPa for pure Ti implants, as-received coating implants, water vapor treated implants and heated in air implants respectively. The results showed that the water vapor post treated HA coating have better mechanical behavior in vitro and in vivo
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.337.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of Collagen by Hydrogel Formation Method (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 288-289 (June 2005), p. 377-380 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A kind of medical collagen was prepared by hydrogel formation method. Chemical and physical properties were investigated by FTIR, amino acid analysis, SDS-PAGE, carbohydrate content analysis, heavy metal content analysis. Degradation experiments in vivo and subsequent histological investigations were carried out to evaluate the biological performance. The results suggested that the collagen achieved is promising in tissue engineering scaffold materials for a long-term (more than 12 weeks) implantation application
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.288-289.377.pdf
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