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  • 2005-2009  (17)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Study of Animal Bio-Ceramic Implants with 3D High Resolution CT (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1629-1630 
    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: Animal implants experiments are obligatory when developing human artificial hard tissues, such as bio-ceramics. Optical microscope is often used to inspect implant slices but may destroy original status when slicing up. We tried 3D high resolution CT to nondestructively study biocompatibility and degradation of bio-ceramics implants. 3D CT provides 3D structure information. Typical pixel size of 3Dhigh resolution CT is 50 microns. Generally, implants differs with tissues in density and structure, on basis of which we can identify details with CT slice. Experiments of bio-ceramic implanted into rabbit hip are also showed. Interaction could be identified at interface between implant and tissue
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1629.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Bond Strengths of Alumina-Glass and Zirconia-Glass Composites to Opaque-Dentine Porcelain (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1258-1260 
    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 conducted to evaluate shear bond strength between self-made alumina glasscomposites (AGC), zirconia glass composites (ZGC) and Vita alpha opaque-dentine porcelain, and alsoevaluate the effects of different surface treating methods on the bond strength. The AGC and ZGCspecimens were treated differently and then bonded with Vita alpha opaque-dentine porcelain. The bondstrength was measured by shear test and the surface treating methods included no-treatment, sandblastingand etching. The results showed that the values of bond strength for AGC groups were 30.1, 41.1 and 41.9MPa respectively, and the bond strength of both sandblasting group and etching group were significantlyhigher than that of the untreated group; the bond strength of ZGC groups were 60.2, 63.6 and 35.5MParespectively, and the value of sandblasting group was significantly higher while etching group was lowerthan that of untreated group. These results indicated that Vita alpha opaque-dentine porcelain can be wellsintered to self-made AGC and ZGC. Sandblasting can greatly improve the bond strength for both AGCand ZGC, while the etching treating method had different effect on their bond strengths
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1258.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Tissue Engineering Scaffolds of Bioceramics and New Bone Growth (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1161-1165 
    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 describes β-TCP/DCHA and mineral phase structural bioceramics(CHA) as well astheir 3-D structures, bioactivity, degradability and introducing new bone growth. FT-IR, XRD, SEM andMicro-CT were used to evaluate β-TCP/DCHA and mineral phase structural ceramics before and afterimplantation. Osteoblasts were immersed in the bioceramics and implanted in the rabbit femora. Theexperimental results showed that new bone grown in β-TCP/DCHA, and scaffolds were degraded withnew bone formation and growth. The results indicated that β-TCP/DCHA was a better tissue engineeringmaterial. A kind of biomaterial (β-TCP/CHA) can be used for in situ formation or in vitro individuationformation. The experimental results indicated that β-TCP/CHA possessed better osteoblast affinity.Osteoblasts can adhere, proliferate and grow better on the material. The experiments in vivo showed thematerials bonded with osseous tissue. The implants were degraded obviously after 6 months, and newbone replaced degradation materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1161.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Study on Dental Colored Zirconia Restoration (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1255-1257 
    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 paper explored the color and mechanical properties of CeO2 and Er2O3 shaded zirconiaceramics for dental application. Twelve kinds of colored dental ZrO2 powders were prepared.Experimental results showed that the hue of the materials shift from yellow-green to yellow-red with theincreasing concentration of the CeO2 and Er2O3, while reducing of the brightness( L* ) value was little.Three-point bending strength decreased form 1209MPa to 845MPa after coloring, which was lower thanthe uncolored materials (1301MPa). The fracture toughness decrease slightly. SEM observation revealedmore porous microstructure in specimen containing both two additives. Cerium oxide and erbium oxideare candidates of color additives for shading dental zirconia ceramics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1255.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Setting Behavior of Fast-Setting Calcium Phosphate Cement with Mineral Phase of Bone (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1567-1570 
    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 setting behavior of fast-setting calcium phosphate cement (FSCPC) with mineral phase of bone was investigated to evaluate the possible value of the CPC for medical and dental application. Various aspects of the setting behavior such as setting time, mechanical strength and phase change of cement with time were measured by the Vicat needle method, diametral tensile strength measurement, and quantitative powder X-ray diffraction (XRD) analysis, respectively. Thechange of microstructure during the setting process was observed by Scanning Electron Microscope (SEM). The setting time of the CPC was 10-15min. As a result of its fast setting, set specimens of FSCPC showed high mechanical strength. Powder XRD analysis revealed faster conversion of FSCPC into HAP. SEM observation showed that the specimens are mainly formed with micropores and crystallites, and the phase composition of the set specimens is mainly low-crystallinity HAP at last
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1567.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Study on Physicochemical Properties of the Carbonated Hydroxyapatite Bone Cement (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1545-1548 
    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: Carbonated hydroxyapatite (CHA) bone cement is capable of self-setting and has the component similar to the mineral phase of natural bone. But it is compact in structure and short of cavity, which limits new bone growing into CHA bone cement. In this paper, the foaming method was adopted to prepare the porous CHA. The setting time, compressive strength, porosity and pore size of the CHA were examined. The phase composition of the CHA was tested with XRD and FT-IR. Themicrostructure of the CHA was observed with SEM. The results show that setting time of 7~19 minutes, compressive strength of 26~32MPa, pore size of 100~200µm, porosity of 50~60%
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1545.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Surface Crystallization of ZnO-Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉-SiO〈sub〉2〈/sub〉 Glass (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1655-1658 
    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: ZnO-Al2O3-SiO2 glasses with different surface conditions were surface crystallized by different heat treatment process. Differential thermal analysis (DTA), X-ray diffraction analysis (XRD) and scanning electronic microscope (SEM) were used to investigate the crystallization behavior of glasses, the crystalline components and microstructure of the as-got glass-ceramics.According to the DTA results, different heat treatment processes of surface crystallization on the glass were adopted. The SEM results show that surface conditions of glasses are important for the surface crystallization, and the thickness of surface crystalline layer increases with heat treatment time
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1655.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation of Porous Hydroxyapatite Scaffolds (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1541-1544 
    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) ceramic scaffolds were prepared using three-dimensional (3-D) gel-lamination technology with sodium lauryl sulfate as foaming agent and lauryl as foaming stabilizing agent. With gelling system of sodium alginate and calcium chloride, the foamy HA slurry was gelled layer by layer on the 3-D gel-lamination machine to prepare the porous ceramic scaffolds. The viscosity of the foamy ceramic slurry was examined. After sintering, the porous HA bioceramicwas characterized in terms of the porous microstructure and mechanical properties. The experimental results demonstrated that the resultant porous ceramic with appropriate pore size, porosity characters, mechanical properties and bioactivity could be obtained
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1541.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Strength and Fracture Mode for Dental Colored ZrO〈sub〉2〈/sub〉 Ceramics Coated with Dental Porcelain (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1248-1251 
    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 investigate the flexural strength and the mode of failure ofdental colored ZrO2 ceramics with or without porcelain coating. Colorants (Fe2O3,CeO2, etc.) were mixedwith 3Y-TZP powder to prepare colored dental zirconia. Specimens were made in monolithic or bilayeredforms which were coated with veneering porcelain. Experimental results showed that there were notsignificantly differences of bending strengths between white and colored materials or between bilayeredspecimen, while the strength of monolithic specimen were significantly higher than their bilayeredcounterpart. In all bilayered specimens, the bulk fracture initiated at the tensile surface of the corematerial and was consistently accompanied with porcelain crush and delamination at the interface.Colorants for 3Y-TZP had minor effects on its mechanical properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1248.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Self-Setting Biphase Porous Calcium Phosphate Cement (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1615-1617 
    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 work has achieved a novel self-setting biphase porous calcium phosphate cement (CPC).This biphase porous CPC is mainly formed by α-tricalcium phosphate (α-TCP) and β-tricalciumphosphate (β-TCP). The influence of the weight percent (wt%) of β-TCP of the powder was studied. Thesetting time is mainly 10-30min, and increasing with the weight percent of β-TCP. Powder ray diffraction(XRD) analysis showed that most α-TCP have turned to low-crystallinized HA after immersed inSimulated Body Fluid (SBF) of 37˚C for 7 days. SEM observation showed that the resultants are mainlyformed with micropores and microcrystallites, and more micropores turned out in cements with moreβ-TCP after immersed in SBF for 8 weeks
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1615.pdf
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