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  • 1
    Electronic Resource
    Electronic Resource
    Biomineralization of Electrospun Nano-HA/PHB GTR Membrane (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 695-698 
    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 3-hydroxybutyrate (PHB) as a kind of polysaccharides has been proved promising fortissue engineering because of its biocompatibility and biodegradability. But its poor mechanicalproperties and hydrophilicity limit its application. In order to explore a new useful porch to improvethe performance of PHB-based GTR membrane, membrane composed of nano-HA / PHB compositewas manufactured through the air/jet electrospinning process which can potentially generatenanometer scale diameter fibers and enlarge surface area of materials while maintaining highporosity. Successively, the biomineralization behavior of the membrane in supersaturatedcalcification solution (SCS) was studied. The Results of this investigation show that the successfullymanufactured porous nano-HA/PHB membrane has high activity in SCS and its ability of inducingthe formation of mineral crystal in vitro than that of the unfilled PHB membrane. It can be concludedthat the addition of nano-HA and the novel technology could improve the performance of thePHB-based GTR membrane
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.695.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Growth of Calcium Phosphate on Poled Piezoelectric Poly-L-lactic Acid Membrane by a Biomimetic Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 703-706 
    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 bioactivity of poled piezoelectric PLLA membrane was investigated by studying thecalcium phosphate formation in vitro using a biomimetic method. Samples (φ10mm) were poledunder DC electric field of 8~l0kV/cm at 70°C for 30 min followed by cooling under the electric field.Surface chemistry of the samples before and after poling treatment was studied by X-rayphotoelectron spectroscopy (XPS). Poled/unpoled samples were immersed in supersaturatedcalcification solution (SCS) for periods up to 24 h (36.5℃). The surface morphology and compositionof the soaked samples were evaluated by using scanning electron microscope (SEM) and X-raydiffraction analysis (XRD). Poled samples showed two different charged surfaces, negatively-chargedsurface (N-PLLA) and positively-charged surface (P-PLLA). On the N-PLLA surfaces, SEM togetherwith XRD showed a gradually formed calcium phosphate (Ca-P), while no obvious Ca-P on eitherP-PLLA or unpoled samples was observed. This study demonstrated that poled piezoelectric PLLAsubstrates induce substantially higher level of Ca-P formation than electrically neutral substrates andonly N-PLLA, however, can improve Ca-P formation after immersion in SCS
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.703.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Controlled Crystallization of Tooth-Like Hydroxyapatite under Gelatin Monolayer (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 663-666 
    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: Based on the molecular recognition theory, an organic molecules model was designed toinduce the hydroxyapatite crystallization, to build a tooth-like calcium phosphate/hydroxyapatiteunder a controllable way in vitro. The cross-linking of collagen on the dentin surface and gelatin wasoptimized by varying the molar ratio of N,N-(3-dimethylaminopropyl)- N'-ethyl-carbodiimidehydrochloride (EDC) and N-hydroxysuccinimide (NHS) at a constant EDC concentration. CaCl2 andNa3PO4-12H2O solutions were added after the crosslinking process. The whole process requiresrepeating the crosslinking and mineralization process for five times. The obtained composite werecharacterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) as well as energydispersive X-ray photoelectron spectroscopy (XPS). The results showed that the dentinal tubule wereblocked by neonatal hydroxyapatite layer which has a continuous structure of columns crystal withsize of 10-40nm. Furthermore, there was column crystal with parallel direction inside, similar to thecrystal array in the top of enamel rod. This study showed that the specific organic molecule model canbe used as a potential effective crystal growth modifier
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.663.pdf
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