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  • 1
    Electronic Resource
    Electronic Resource
    The Effect of Microporous Structure on Bone-Bonding Ability of Titanium (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 211-214 
    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 three different structures of titanium oxide film were prepared: (1) The commercial pure titanium was treated with heating in air at 700°C for half hour and gotten a dense rutile film on titanium (HS Samples); (2) The commercial pure titanium was treated by chemically treating and gotten a layer of amorphous titania gel on the Ti surface (TS Samples); (3) After chemically treating, the samples were heated in air at 700 °C for half hour, and gotten nano-particles coalescedmicroporous titanium oxide (rutile) film on titanium surface (XS sample). The dense rutile and amorphous titania gel did not induce apatite formation on their surfaces in SBF solution for 48 hours, whereas the nano-particles coalesced microporous rutile structure induced apatite formation on their surfaces. Mechanical test and histological examination were investigated after the samples implanted in dogs limbs for 3 months. The results of push-out test are 12.96, 29.48 and 35.83 MPa respectively for HS, TS and XS sample. Histological results showed that TS sample and XS sample contacted the bone directly, without any intervening fibrous tissue, and there was a fibrous tissue layer between the bone and HS samples
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.211.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental Study on the Osteoinduction of Calcium Phosphate Biomaterials In Vivo and the Capability of Supporting Osteoblast Proliferation In Vitro (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 293-296 
    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 purpose of this study was to evaluate the response of osteoblasts to the calcium phosphate with different surface modification, and to evaluate the osteoinductive capabilities of these biomaterials. 60HA/40α-TCP ceramics sintered at 1250oC was applied in this study. The ceramic cylinder with F5mm×8mm and slice with F10mm×1mm were prepared respectively. One thirds of the ceramics were formed bone-like apatite (BLA), and the surface of another one thirds was modified with collagen. Osteoblasts (1×106/ml) were co-cultured with the three kinds of thin slices for 12h, 24h and 48h. SEM observation was applied to evaluate if the surface modification and BLA formation could affect the attachment and proliferation of osteoblast in vitro. The three kinds of cylinder samples were implanted in dog muscle to evaluate their differences in osteoinduction. Cells grew inmulti-layers and well attached to the surface and proliferated well in the group of collagen and HA/TCP. In untreated and BLA precipitated group, cells did not attach to the surface well. Osteoinduction was good in BLA precipitated group and the amount of bone formed was higher; in untreated group and collagen-treated group, no bone formation was observed in the tested period. This result indicated that the scaffold used in cell-materials composites in vitro and that in osteoinductive material based tissue engineering in vivo was not same
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.293.pdf
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  • 3
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    In Situ Synthesis of PVA-PAA-HA Interpenetrating Composite Hydrogel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 309-311 (May 2006), p. 1165-1168 
    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 composite hydrogel with interpenetrating network structure was prepared via in-situ synthesis of calcium phosphates during the physical-chemical crosslinking of poly(vinyl alcohol) (PVA) and poly(acrylic acid) (PAA). The hydrogel water content was tested. Fourier transforminfrared absorption spectrum (FT-IR), X-ray diffraction and scanning electron microscopy were employed to evaluate the characteristics of the composite hydrogel. The results showed that the composite hydrogel had high water content and that the inorganic phase was poorly crystallinecalcium phosphates. FT-IR confirmed that the interpenetrating network structure was formed between PVA and PAA. The chemical interactions between inorganic and organic phases were further investigated and discussed. The composite hydrogel with an interpenetrating network achieved using the present novel method could be a promising material for tissue engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.309-311.1165.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Collagen-Calcium Phosphate Hybrids for Bone Grafts: A Novel Route Leading to High Initial Strengths (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 309-311 (May 2006), p. 1185-1190 
    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: An organic/inorganic composite hydrogel route was used to prepare collagen-calciumphosphate hybrids with high mechanical strengths, via in-situ mineral synthesis during collagen fibrillogenesis followed by dehydration. An array of characterization techniques including X-ray diffraction and Fourier transform infrared spectroscopy analyses confirmed that the final products are analogous to natural bone. A three-point bending strength of 70 MPa, much higher than the values reported in the literature, was recorded in the present case, due to the three dimensionalnetwork structure achieved between inorganic and organic phases. This innovative method provides an efficient route to produce bone grafts with the desirable mechanical properties which are dependent upon the actual inorganic/organic ratio and water content
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.309-311.1185.pdf
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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Evaluation of Bioactivity and Cytocompatibility of Nano-Hydroxyapatite/Collagen Composite In Vitro (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 553-556 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.553.pdf
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