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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Electrodeposited Hydroxyapatite Coatings on Biomedical Titanium by Cathode Revolving (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1525-1528 
    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 paper deals with a kind of new method of the electro-deposition on titanium by acathode revolves. The depositing characteristic and mechanic were studied by scanning electron microscopy and X-ray diffraction. The experimental results show that the more fine uniformity and compact calcium phosphate bioactive coatings could be produced, compared with the conventional methods. The gradient Coating, which is fine inside and porous outside, could be obtained by controllingrevolving velocity. The coating would transform to the hydroxyapatite after heat-treatment. After soaking in a simulated body fluid (SBF), nano-depositions were formed on the surface of the coating, then those particles would grow up needle-like, net-like, and an apatite-like layer could be observed finally. The gradient porosity coatings produced by cathode revolving electrochemical deposition would have high anti-dissolution and bioactive
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1525.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of the Porous Hydroxyapatite/Silk Fibroin Composite Scaffolds with Interconnected Ducts (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1190-1193 
    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: Porous hydroxyapatite (HA) bioceramic matrix with interconnected ducts was obtained using aporogen burnout technique at 1200°C. The HA/silk fibroin (SF) composite scaffolds were developed withthe SF sponges formed inside the pores and ducts of the bioceramics by first introducing HA/SF slurriesinto the pores and ducts followed by a freeze-drying process. Phase components and morphology ofmaterials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM),respectively. Porosity was measured by Archimedean method. Compressive strength was also measured.The simulated body fluids (SBF) experiments were conducted to evaluate bioactivity. The results showthat hydroxyapatite is the main phase compositions after sintering at 1200°C. The porosity of compositescaffolds reaches 70%~80%. The sizes of pores and ducts of HA matrix range from 150μm to 400μm andthe pore sizes of SF sponges formed inside the macroporous structure of bioceramics are approximately100μm,a structure favorable for bone tissue in-growth. The compressive strength of the compositescaffolds is greatly improved in comparison with that of HA matrix. In the SBF tests, a layer of randomlyoriented apatite crystals form on the scaffold surface after sample immersion in SBF. The cell cultureexperiments show that the osteoblast cells are attached and proliferated on the surface of the compositescaffold, which suggest good bioactivity and cellular compatibility of the composite material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1190.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Study of Nano-Hydroxyapatite on the Remineralization of Dismineralized Teeth (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 2423-2426 
    Details
    ISSN: 1662-9752
    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 hydroxyapatite (HA) particle with different morphologies were prepared by adding a certain additive into Ca(H2PO4)2·H2O and controlling the bathing and sintering temperature, and the pure needle-like HA sol were obtained when the bathing temperature was 70℃. The experimental results show that the degree of crystallization of HA increase and the particles tend to accumulate with increasing of the drying and sintering temperatures. The particles of HA were spheroid, whichdiameters were of less than 100nm when they were sintered at the temperature of 700℃. The effect of nano-hydroxyapatite on remineralization of early enamel caries were studied too. The hardness of dismineralized enamel was increased when dismineralized enamel was remineralized by nano-hydroxyapatite. The SEM analysis shows that the interspace of enamel surface were decreased and the many mineral salts were sedimentated, which indicated that the nano-hydroxyapatie could promote remineralization for the dismineralized enamel
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.2423.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Study on Tissue Engineering Scaffolds of Silk Fibroin-Chitosan/ Nano-Hydroxyapatite Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 971-975 
    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 porous scaffolds of silk fibroin-chitosan /nano-hydroxyapatite (SF-CS / n-HA) werefabricated through the freeze- drying technique. Component, structure and morphology of scaffoldswere studied by infrared (IR), X-ray diffusion (XRD) and scanning electron microscope (SEM), andthe mechanical properties of the scaffolds were measured. The simulated body fluid (SBF)experiments were conducted to assess the bioactivity of the scaffolds. Results indicate that chemicalbinding is formed between HA and organics, the macropore diameter of the scaffolds varies from150 to 400μm. The porous scaffolds with interconnected pores possess a high porosity of 78%-91%and compressive strength of 0.26 -1.96MPa, which can be controlled by adjusting the concentrationof organic phases and prefreezing temperature. In the SBF tests, a layer of randomly orientedbone-like apatite crystals formed on the scaffold surface, which suggested that the compositematerial had good bioactivity. Studies suggest the feasibility of using SF-CS /n-HA compositescaffolds for bone tissue engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.971.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Caries Inhibitory Activity of the Nano-HA In Vitro (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 251-254 
    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 is to examine the inhibitory effects of nano-HA on thecaries-inducing properties of a four-organism bacterial consortium in vitro. A series of in vitroanticarious experiments have been carried out by using a continuous culture system. Streptococcusmutans, Streptococcus sanguis, Actinomyces viscosus, Lactobacillus rhamnosus have been chosen asthe experimental bacteria. After 48 hours, the dental plaque surface structure is observed with thescan electron microscope and the bacterial colonization was evaluated on dental plaque. The resultsshow that Spherical nano-HA and mixed nano-HA are proved to be effective in anticariousexperiments, and especially spherical nano-HA is more striking. It is able to damage the formation ofbiofilms (dental plaque), postpone or end the process of acid generation of bacteria metabolism. After7 days, the demineralization of the enamel has been detected by using TEM. The spherical nano-HAmight have a remineralization to early caries to prevent and decrease caries
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.251.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Remineralization Effect of the Nano-HA Toothpaste on Artificial Caries (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 267-270 
    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 describe the remineralization effect of the nano-HA toothpasteon artificial caries. The artificial dental caries is made using sour solution. The demineralized teethspecimen is put into five kinds of toothpaste solution respectively for 5 days and 10 days, whichare: solution of containing needle like nano-HA, solution of containing spherical nano-HA, solutionof general HA, fluorine sodium solution and physiological saline. The hardness of specimen ismeasured and the surface morphology is characterized by SEM. The remineralized test indicatesthat the nano-HA toothpaste can enhance the hardness of artificial caries and improve theremineralization of artificial caries. The SEM analysis shows that the cavities and defects of enamelsurface are decreased and many mineral salts are sedimentated, which indicate that the nano-HAcould promote remineralization for the demineralized enamel
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.267.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    A Novel Approach to Prepare Nano-Hydroxyapatite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 341-344 
    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 of needle-like nano-Hydroxyapatite / silk fibroin (n-HA/SF) with stronginterfacial bonding was successfully prepared from calcium chloride (CaCl2) and diammoniumphosphate ((NH4)2HPO4) as starting materials of HA in the presence of SF powders dissolved in aternary solvent system of CaCl2-C2H5OH-H2O (1:2:8 in molar ration) at 80 °C for 30 min prior topreparation of n-HA/SF composite. The n-HA crystals in the composite were poorly crystallized anduniformly distributed in the composite with a crystal size of 4~6 nm in diameter and 20~40 nm inlength, which was smaller than that of pure nano-HA. Molecular interaction and strong chemicalbonds were formed between n-HA and SF in the composite, which were revealed by Fouriertransform infrared spectrometric analysis (FTIR). The synthetic n-HA/SF composite had a goodhomogeneity and preferential orientation along c-axis and would have a great potential for bonetissue 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.330-332.341.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Inhibitory Effect of Synthetic Nano-Hydroxyapatite on Dental Caries (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1538-1541 
    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 objective of this study was to investigate the inhibitory effect of the synthetic nanohydroxyapatite(HA) on dental caries. The nano-HA was synthesized by using the depositing reaction ofCa (H2PO4)2. The artificial dental caries was made by using sour solution and inoculating Streptococcusmutans (S.mutans) to the Sprague-Dawley (SD) rat’s mouth respectively. After mineralization of solutionof nano-HA for 10 days, the hardness of enamel was measured. The inhibitory effect of the syntheticnano-HA on dental caries was detected by gargling way to rinse the rat tooth with the solution of nano-HAin the animal test. Transmission electron microscopy (TEM) revealed that the dried HA particles wereneedle-like with ф5-20nm×60nm and the sintered HA particles were spherical with less than 100nm. Theremineralized test indicated that the solution of nano-HA with different shapes enhanced the hardness ofartificial caries and improved the remineralization of artificial caries. The animal test showed that thedried nano-HA had the inhibitory effect on dental caries. The good absorptive effect of the nano-HA onboth the saliva protein and the glucans leads to the development of interventions that could reduce ormodify bacterial colonization of tooth surfaces
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1538.pdf
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