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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of Nanosized Carbonated Hydroxyapatite under Microwave Irradiation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 303-306 
    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 order to solve the problems on synthesizing carbonated hydroxyapatites (CHA) by theconventional heating precipitation method, such as long reaction and large particle size, poorcrystallinity of CHA etc, the nanosized CHA particles have been synthesized by microwave heatingmethod using phosphoric acid (H3PO4), calcium hydroxide (Ca(OH)2) and calcium carbonate(CaCO3 ) as starting materials in the present paper. The influences of power level and time ofmicrowave irradiation on synthesis of CHA have been investigated. The X-ray diffraction (XRD)analysis has indicated that microwave heating will reduce CHA crystallization time and improvecrystallinity of CHA. Scanning electron microscope (SEM) analysis has showed that CHA particlesare of rod like morphology with about 60nm width and 200nm length respectively. Infraredspectroscopy (IR) analysis has confirmed the B-type CHA precipitate can be formed undermicrowave irradiation. The microwave irradiation plays an important role to promote the reactionand the synthesis of nanosized CHA particles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.303.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and Cytocompatibility of Novel Nano-HA/PLA Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 369-372 
    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 order to prepare nano-hydroxyapatite/poly(lactide) (n-HA/PLA) composite with goodinterfacial interaction, some groups which could bind with Ca ions in HA crystals need to beintroduced onto PLA surface. Poly(α-methacrylic acid) (PMAA) was grafted on the PLA surfacesvia photooxidization and subsequent UV induced polymerization. Suspension of PMAA-PLAmicroparticles with an average size as 133.1nm was prepared with solvent evaporation technique.Then utilizing the action of template manipulating of PMAA-PLA microparticles, n-HA/PLAcomposite were synthesized. Zeta potentials measurement and SEM indicated that there were goodinterfacial interactions between two phases of n-HA/PLA composite. The results of cell viabilityconfirmed that n-HA/PLA composite possessed good cytocompatibility, so the n-HA/PLAcomposite scaffold obtained by electrospun technology might be used as bone tissue engineeringscaffold
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.369.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    The Influence of Bovine Serum Albumin on the Biomimetic Calcium Phosphate Coating of Bioactivated Titanium (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 581-584 
    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 study, bovine serum albumin protein (BSA) was introduced to investigate theco-precipitation process of calcium phosphate and BSA on bioactivated Ti. Commercially puretitanium were bioactivated firstly, and then immersed in a highly supersaturated stable calciumphosphate (Ca-P) solution at three different conditions. The samples designated as Ti-C, Ti-C-CB, andTi-C-B for control. The samples were evaluated by SEM with EDX, XRD and XPS. Theco-precipitation of BSA protein and Ca-P influenced the morphology of the crystals of Ti-C-CBsignificantly. In terms of the immersion in the Ca-P solution containing BSA, the co-precipitation ofCa-P with BSA on the surface of Ti-C-CB was a chemical process rather than simple physicaladsorption, which was most possibly achieved by the linkage of –COO− groups to Ca-P. Suchcoprecipitated interaction led to the formation of a tight, dense and uniform Ca-P coating
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.581.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Repairing Periodontal Bone Defect with In Vivo Tissue Engineering Bone (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1121-1124 
    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 develop a feasible approach for repairing periodontalbone defects with the in vivo tissue engineering bone incorporated with bioabsorbable PLAmembrane and to provide evidences for the clinical application. Osteoinductive HA/β-TCP sinteredat 1100℃ were implanted in the femur medial muscles in the hind legs of three dogs. Fourweeks after implantation, the in vivo tissue engineering (TE) bone was explanted. Meanwhile,artificial periodontal bone defects of 8mm×6mm were performed on the buccal side of 4th premolarand 1st molar of mandible bilaterally, with the exposure of dental roots. The defects were treated asfollows: (1) in vivo TE bone and PLA membrane; (2) HA/β-TCP ceramics and PLA membrane; (3)PLA membrane only; (4) empty control. At the 2, 4, 8 weeks post-transplantation, the dogs weresacrificed. The specimen were harvested and evaluated by gross inspection, dental radiography,SPECT (99mTC-MDP) and histological observation by MPIA2500. The results showed that moremature osseointegration was found in the group 1. We presumed that the in vivo TE bone graftcould enhance the reparation of periodontal bone defects
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1121.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Reconstructing Box-Like Bone Defect of Mandible with In Vivo Tissue Engineering Bone (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), 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: The purpose of this study was to explore the feasibility of repairing massive bone defectwith in vivo tissue engineering(TE) bone, and to provide experimental evidence for the applicationof in vivo TE bone into clinic in the future. Six calcium phosphate ceramics (Ca-P ceramics)columns were prepared, and then immersed in dynamic revised simulated body fluid (RSBF). 72hours later, the bone-like apatite was formed on the surface and pore walls of ceramics. Three dogswere used in this study. Two ceramic columns were implanted bilaterally in the femoral muscles ofeach dog to construct living bone graft of in vivo TE bone. 6 weeks after implantation, they weretransplanted to the box-like bone defects sites created in bilateral mandible of the same animals.The dogs were sacrificed at 8, 12 week after operation respectively. Samples were harvested forgross observation, X-ray examination, tetracycline fluorescence labeling, SPECT and histologicalobservation. These results demonstrated that as a living bone graft, in vivo TE bone participated inthe bone metabolism of host, and integrated with the host bone. It is feasible to reconstruct box-likebone defect of mandible with the in vivo TE bone
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1165.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Collagenous Molecule Immobilization on Hydroxyapatite Surface (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 741-744 
    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: Collagenous molecule was successfully immobilized to hydroxyapatite (HA) surfacethrough a molecular bridge (2-Hydroxyethyl acrylate, HEMA) that was grafted to the surface withcovalent bond by gamma irradiation. Hydroxyapatite modified by atelocollagen had beencharacterized by several surface sensitive techniques, such as FT-IR, SEM, XPS. The investigationsshowed that the collagen, a bioactive macromolecule, was immobilized on the HA surface throughcovalent bond
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.741.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    The Evaluation of Cytotoxicity and Histological Response of Periradicular Tissues of a New Injectable Root Canal Sealer (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1357-1360 
    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 biocompatibility of a new injectable rootcanal sealer. The cytotoxicity of zinc oxide-eugenol cements, CCQ and the new injectable rootcanal sealer were assessed by the MTT assays. These materials were filled into the root canals ofthe dog. One month later, the dog was sacrificed and the X-ray photos were taken. The histologicalresponse was observed through the microscope. The results show the new injectable root canalsealer showed better biocompatibility than the other two materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1357.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
    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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  • 10
    Electronic Resource
    Electronic Resource
    Star-Shaped Poly (Γ-Caprolactone-b-Ethylene Glycol): Synthesis, Characterization and Aggregation Behavior (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 725-728 
    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: Linear and Star-shaped PCL-b-PEG copolymers were synthesized through a two step process,including the first step to synthesize the star-shaped PCL through ring-opening polymerization ofΓ-caprolactone initiated from multi-functional alcohol under the existence of tin(II) ethylhexanoate[Sn(Oct)2] catalyst, and the following step to couple the obtained star-shaped PCL with PEGsegments using bi-functional linker. The structure of the polymers was confirmed by IR, NMR,GPC, et al. The aggregation behaviors of the star-shape copolymers were compared with that of thelinear block copolymer with corresponding molecular weight of each arm, and the influences ofstructure factors were discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.725.pdf
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