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  • 1
    Electronic Resource
    Electronic Resource
    Studies on Non-Quenched Calcium Phosphate Cement: Influences of Quenching and Milling on Setting Characteristic (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 39-42 
    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 is to explore the effects of quenching and milling processing onsetting property of calcium phosphate cement (CPC). For this purpose, non-quenched α-tricalciumphosphate (α-TCP) and quenched α-TCP were synthesized and their corresponding cement systemswere prepared. The particle size of α-TCP powder was introduced as a variable. Then, settingproperties of these CPC systems were estimated. By a comparison between non-quenched CPC andthe quenched one, it is found that milling processing mainly influences the initial setting stage bydecreasing reactant particle size whereas the quenching treatment affects the final setting stage bychanging α-TCP content, which supports that CPC setting initially depends on the surface area ofreactants and subsequently on the diffusion through the hydrated layer formed around the reactants
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.39.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Antibacterial Activity of Silver-Hydroxyapatite/Titania Nanoparticles on Oral Bacteria (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 299-302 
    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: Since bacterial accumulation surrounding biomaterials has pathogens known to cause thebiomaterials centered infection, it may be important to develop some kind of biomaterial withantibacterial activity as well as biocompatibility. This study focused on evaluating the antibacterialactivity of silver-hydroxyapatite/ Titania nanoparticles (Ag-nHA/nTiO2) against oral bacteria withagar dilution method. Bacteria were seeded on agar plate containing antibacterial material withdifferent concentrations after incubation of 48 hours. The antibacterial activity was demonstrated byMICs. The MICs of Ag-nHA/nTiO2 ranged between 1000μg/ ml and 7500μg /ml under anaerobicconditions. And it also exhibited remarkable antibacterial activity to all the aerobe bacteria(MIC≤500μg/ml). On the other hand, the antibacterial activities of Ag-nHA/nTiO2 differentiate tosome extent with the bacterial strains. This Ag-nHA/nTiO2 exhibited remarkable antibacterialactivity to anaerobic and aerobe bacteria. This antibacterial effect may reduce the potential forbacterial colonisation of oral biomaterials with Ag-nHA/nTiO2
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.299.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Antibacterial Activity of Silver-Hydroxyapatite/Titania Nanocomposite Coating on Titanium against Oral Bacteria (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 455-458 
    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: This study was focused on evaluating the bactericidal and anti-adhesive efficacy ofsilver-hydroxyapatite/ titania nanocomposites (nAg-HA/TiO2) coating on titanium against oralbacteria. Porphyromonas gingivalis, Prevotella intermedia and Fusohacterium nucleatum andStreptococcus mutans were used. Antibacterial activity of nAg-HA/TiO2 coating was investigatedquantitatively using film applicator coating method and titanium plates incubated with bacteria wereprepared for SEM to observe the adherence of oral bacteria. The viability of each type of bacteria onthe antibacterial film was suppressed to about 10% after anaerobic incubation for 3 hours. Image ofSEM demonstrated that bacteria on sandblasting surfaces were relatively confluent whilst on coatedsurfaces fewer bacteria were observed. Adherence of bacteria on nAg-HA / TiO2-coated surfacescompared with uncoated surfaces was remarkably decreased
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.455.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Nano-Hydroxyapatite/Polymer Composite Scaffold for Bone Tissue Engineering (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 365-368 
    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: Nano-hydroxyapatite/polyamide66 (n-HA/PA66) composite scaffolds are prepared usingphase separation and phase separation in combination with particle leaching, and both thecomposite powder and paste are used as starting materials. The composite is characterized by IRand XRD. The micro-architecture of the scaffolds is observed by SEM, and the mechanisms that theformation of the porous structure follows have been investigated preliminarily. The results showthat scaffold prepared by phase separation in combination with particle leaching method usingcomposite powder as starting material possesses controllable porosity and interconnectivity, as wellas good mechanical strength comparable to human cancellous bone, suitable for being thetissue-engineered scaffold for load-bearing bone repair. Furthermore, scaffold made by phaseseparation using composite paste as starting material exhibits an anisotropy both in morphology andmechanical properties, which indicates the potential of guiding cell seeding, distribution and newtissue formation in preferential direction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.365.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Apatite Nanoparticles on Remineralization of the Demineralized Human Dentin (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1381-1384 
    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 evaluate the remineralizing potential of demineralizedhuman dentin treated with Y/HA nanoparticles (doping Y with 5mol %) and HA nanoparticlessuspension and whether dentin could be remineralized by HA. Human crown dentin wasdemineralized with EDTA for 4 hours, and then subjected to remineralization condition. The abilityof these matrices to remineralize was determined by SEM, AFM and calcium levels in theremineralized tissue were measured by atomic energy spectrum analysis. The results showed thatY/HA and HA nanoparticles remineralized the demineralized dentin surface; these demineralizedmatrices treated with Y/HA nanoparticles remineralized to a greater extent than those treated HAnanoparticles. The differences in both the quality and quantity, as defined by Yttrium iones leadingto changes in characterization of the apatite crystals might be important in effecting the ability ofthis tissue to remineralize. This work suggested that apatite nanoparticles caused remineralization ofdentin and the yttrium ions substituted in the apatite structure might enhance their remineralizationpotential
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1381.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Evaluation of Osteoblast Responses to Silver-Hydroxyapatite/Titania Nanoparticles In Vitro (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 447-450 
    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: In the present in vitro study, osteoblasts proliferation, vitality and ultrastructure wereinvestigated when cultured in the presence of silver-hydroxyapatite/titania nanoparticles(nAg_HA/TiO2) compared to HA nanoparticles (nHA) at various concentrations and cell culturewithout nanoparticles for up to 120 hours. Results confirmed the detrimental influences of bothnAg_HA/TiO2 and nHA on osteoblast growth.Cell vitality was slightly higher during the earlier 24h,but after that was inhibited. Both cell proliferation and vitality by addition of nanoparticles wererestricted with concentrations of nanoparticles increasing. However, the respiration rates by additionof nanoparticles were showed higher than that of the cell culture without nanoparticles. Noremarkable ultrastructure changes were showed in the osteoblasts exposed nanoparticles. Thedifference in cell proliferation, vitality and ultrastructure between nAg_HA/TiO2 and nHA wereinsignificant. It was demonstrated that biocompatibility of nAg_HA/TiO2 is almost the same as nHA
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.447.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and Characterization of n-HA/PVA/Gel Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 471-474 
    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 unique composite consisted of nano-hydroxyapatite (n-HA), poly (vinyl alcohol) (PVA)and gelatin (Gel), was prepared and characterized by Fourier transform infrared absorptionspectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and burningtest. The homogenicity of the composite was evaluated, and the presence of interior chemical bondwas confirmed and discussed. Mechanical strength and water absorption of the prepared compositewere investigated, respectively. The results show that n-HA/PVA/Gel composite has goodhomogeneity, similar mechanical properties to natural cartilage and excellent in vivobiocompatibility
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.471.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of n-HA/PA66/CS Biocomposite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 463-466 
    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: Nano-hydroxyapatite/polyamide66/chitosan composite (n-HA/PA66/CS) was prepared bya co-precipitation method, and was characterized by TG/DTG, TEM, IR, XRD and Universalmechanical testing machine. TEM test showed that some rod like crystals were formed anddistributed uniformly into polymer matrix, with a size of about Φ30nm×80nm. IR and XRDanalysis showed that some chemical bonds and electrostatic interaction existed between n-HA andpolymers. TG/DTG curves indicated that the composites possessed a talent of high heat-resistance.The compressive strength of composite changed with different content of three compounds, themaximum compressive strength of composite (70MPa) could be acquired
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.463.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Fabrication of Porous n-HA/PA66 Composite for Bone Repair (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 321-324 
    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: Using nano-hydroxyapatite/polyamide66 composite (n-HA/PA66) and a special foameras start materials, a porous species for bone defect repair was successfully developed bythermal-pressing method. The resulting material presented: (1) high compressive strength whichreached 13~46MPa; (2) excellent porous structure, the average diameter of pores in the matrix wasin range of 280μm to 500μm and porosity of 36% to 57%. The porous architecture could beadjusted by the combination of processing parameters such as the weight of start mixture used permold and the ratio of composite to foamer as well as n-HA content in the composite. No apparentchange in composition and structure of n-HA/PA66 composite was found by XRD and IRdetermination before and after formation of porous species. According to Sherrer equation, thevalue of D(002) of n-HA crystals in porous material and start powder were about 70nm, indicatingno occurrence of change in size of n-HA during the thermal-pressing procedure. Additionally, nofoamer residual was detected in porous species
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.321.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Characterization and Antibacterial Effect of a Novel Nanocomposite Membrane (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 325-328 
    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: In this experiment, un-dried silver-hydroxyapatite-titania nanoparticles slurry was used tomake membrane with Polyamide-66 by co-polymerization method. The morphology, chemicalcomponents and structures of the membrane were characterized by AAS, XRD, SEM and EDX. S.aureus, E. eoli, P.gingivalis, F.nucleatum and S.mutans were utilized to test the antibacterial effect.XRD results demonstrated that the membrane have characteristic diffraction peaks of pure HA. Ahomogeneous distribution of the Ca, P, Ti, and Ag element in the membrane was confirmed byEDX. Both surface and section showed porous structure which was confirmed by SEM and theholes size was average 20-30μm. The bacteria assay reflects to the antibacterial effect, 56.31 % ofS. aureus and 50.10 % of E. eoli were killed after 24 hours incubation. However, 91.84 % of P.gingivalis, 90.64 % of F. nucleatum and 90.49 % of S. mutans were killed and pictures of SEMshowed obviously fewer cells on the surface. So the nanocomposite membrane could be one of thebioactive materials with antibacterial properties for oral GBR technique
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.325.pdf
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