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  • 1
    Electronic Resource
    Electronic Resource
    Mechanical Properties and Marginal Fitness of Glass Infiltrated Alumina Core Fabricated from Aqueous-Based Alumina Tape (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1377-1380 
    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 designed to evaluate mechanical properties and the marginal fitness ofglass infiltrated alumina core fabricated from aqueous alumina tape. Utilizing the automatic Dr.Blade model (DP-150 of Japan JinChungjungGi manufacturer) fabricated the slurry into 0.5 ㎜thickness aqueous-based alumina tape. The coefficient of thermal expansion and biaxial flexuralstrength of alumina composite produced from alumina tape were investigated. Three upper centralresin incisors were prepared with 90o, 110o, 135o shoulder margin for all-ceramic crown. Individualtooth model’s impressions were taken 15times each to make epoxy resin die. Cores were made ofalumina tape to each and every dies. Crown setting was done on the epoxy resin dies. Thespecimens were evaluated for measuring for marginal gaps of glass infiltrated alumina corefabricated from aqueous alumina tapes under 180 magnifications with Kan Scope(SometechVision, Korea) was done. The retained measurements were analyzed with Turkey’s StudentizedRange Test for marginal fitness of each specimen. Coefficient of thermal expansion of alumina tapewas 7.5x10-6/℃, and biaxial flexural strength was observed to be 498±32MPa. The marginal fits ofalumina cores made of alumina tapes showed the least marginal gap of 41.5 ㎛ in the 110o shouldermargin, and increasingly with 135o, 90o shoulder margin. Marginal fitness should be better in angleslarger than 90o
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1377.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Biocompatibility of Calcium Phosphate Ceramics Synthesized from Eggshell (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 23-26 
    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 paper was the HA and β-TCP powers were synthesized by a new wetchemicalmethod using eggshell and phosphoric acid. The biocompatibility of synthesized naturalHA, HA/β-TCP(50:50) and β-TCP derived from eggshell was compared with those of ascommercial chemical powder with mesenchymal stem cells derived from human bone marrow.Development of crystalline phases of the mixtures was studied as functions of mixing ratio andtemperature using X-ray diffractometer. The morphological characteristics of the calcinedeggshell and synthesized powders were examined by scaning electron microscopy. The in-vitrocytotoxicity and cell attachment of sintered disks were examined using human bone marrowderivedmultipotent stem cells(hBMSCs). Cell response was characterized by MTT assay ,Alkaline phosphatase stain and RT-PCR analysis. Pure HA was synthesized in the mixing ratio of1:1.1 wt% at 900℃ for 1h. the crystallization of HA was started at 800℃ in the 1:1.1 mixingratio, ant the HA phase was continued up to the high temperatures. In the ratio of 1:1.3 and1:1.5 wt%, β-TCP was effectively synthesized at 900℃. In the 1:1.5 ratio, β-TCP phase wasdetected at 700℃, and complete crystallized β-TCP was observed above 900℃. At the highertemperature than 1000℃, the β-TCP was gradually decreased and α-TCP was observed. The HAand β-TCP disk does not exert cytotoxic effect on the hBMSCs undergoing osteoblasticdifferentiation. In addition, the hBMSCs are adhered on the surface of synthesized natural HAand β-TCP disk as successfully as on the culture plate or as commercial chemical HA and β-TCPdisk. The hBMSCs adhered on either synthesized natural HA, β-TCP or as commercial chemicalHA, β-TCP disk displays undistinguishable actin arrangement and cellular phenotypes, indicatingthat synthesized natural HA, β-TCP does not disrupt normal cellular responses. Analysis ofdifferentiation of the hBMSCs cultured on culture plate, synthesized natural HA, β-TCP and ascommercial chemichal HA, β-TCP disk shows that three matrices are able to support osteoblasticdifferentiation of the hBMSCs as accessed by alkaline phosphatase staining
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.23.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Base-Coated Zirconia Brackets for Orthodontics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1421-1424 
    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: Yttria and iron co-doped tetragonal zirconia polycrystals ((Y, Fe)-TZPs) were investigatedto evaluate the feasibility for the ceramic bracket application. Presintered the (Y,Fe)-TZPs bracketswere machined, abraded and coated with granule spray containing 10~50 wt% of flux. Finally, thebase-coated brackets were sintered. Roughness of the coated surface was decreased to 13 um and 10um when the flux content was 30 wt% and 50 wt%, respectively. It may be due to the fusion and thecollapse of the granules as a result of the high amount of flux. Better adhesion to the base surface ofthe brackets and irregular shape were observed by raising the amount of flux in the slurries. Wettingangle of ethylene glycol droplet on the (Y,Fe)-TZP bare surface was determined to be 41.85°,however, the angle became 0° after the granule spraying treatments. The (Y,Fe)-TZP bracketsexhibited uniform embossed base and good wetting. The newly developed base-coated bracket couldbe highly applicable to enhance retention and to reduce adhesive resin remnant during the bracketdebonding
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1421.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of Bone Formation in Rabbits Using Hydroxyapatite and β-Tricalcium Phosphate Scaffolds Fabricated From Egg Shells (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 999-1002 
    Details
    ISSN: 1662-8985
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.999.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Preformed Laminating Veneer Porcelain Using Paste System for Fabrication of PFM Crowns (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 937-940 
    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: Feldspathic porcelain paste system using organic vehicle was prepared and applied to fabricate the porcelain fused to metal fixed partial denture. The mean linear fired shrinkage of paste porcelain system was 15.2% that is 0.8% lower than that of conventional build-up method. The color difference between two methods (??E*) was 0.156. Mean biaxial flexural strength of sintered preformed laminating porcelains of this system and conventionally build-up porcelains were 74±3and 70±4 MPa respectively. There was no deterioration of physical properties of feldspathic porcelain system by introducing organic vehicle, and this new build-up method can be applied to fabricate the porcelain fused to metal restorations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.937.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    In Vitro Bond Strength of Based-Coated Zirconia Brackets for Orthodontics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 857-860 
    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 Vitro Bond strength of base-coated (Y, Fe)-TZPs (yttria and iron co-doped tetragonalzirconia polycrystals) were investigated to evaluate the feasibility for the ceramic bracket applications.Pre-sintered (Y,Fe)-TZP brackets were machined, abraded and spray-coated with granule slurriescontaining 10~50 wt% of flux. Better adhesion to the base surface of the brackets was observed byraising the amount of flux in the slurries. It may be because of the fusion and the collapse of thegranules as a result of the high amount of flux. The one-way analysis of variance indicated that therewere significant differences in bond strength measurements between the experimental groups except30% and 50% flux content groups. The Weibull distribution revealed that 50% flux content group isthe best with a high characteristic strength value. Mean ARI values exhibited large differences andranged from 1.6 for 50% flux content group to 3.0 for non-coated group. Adhesive remnant ofadhesive resin was decreased by increasing the flux up to 50%. Reduction in adhesive remnant islikely due to the higher bonding of adhesive resin to granules. No teeth and bracket damages werefound in any teeth de-bonded by shear force. The base-coated brackets with higher strength (11.5MPa) and no adhesive remnant were newly proposed for the orthodontics applications
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.857.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Adhesion Characteristics of Base-Coated Single Crystal Brackets for Orthodontics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 396-398 (Oct. 2008), p. 137-140 
    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: Adhesion characteristics of base-coated single crystal brackets for orthodontics were investigated to evaluate the feasibility for the ceramic bracket applications. Sapphire single crystal ingot were machined, abraded and spray-coated with slurries containing 50 wt% of flux and 40µm, 80µm and 150µm of granules. Maximum adhesion to the base surface of the brackets was observed when the size of granule in the slurries was 80µm. It may be due to higher bonding area of adhesive to granule and to base as a result of interlocking structure which has moderate thickness and uniform distribution of granules. The one-way analysis of variance indicated that there were not significant differences in bond strength measurements between the once and twice coating condition in 80µm and 150µm granule groups. But ARI values exhibited large differences between once and twice coating groups and showed different median or ranges. Adhesive remnant of adhesive resin was minimized when the slurry of 80µm granule was coated once. Reduction in adhesive remnant is likely due to the higher bonding of adhesive resin to granules. No teeth and bracket damages were found in any teeth de-bonded by shear force. The base-coated brackets with higher strength (12.9 MPa) and no adhesive remnant were newly proposed for the orthodontics applications
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.396-398.137.pdf
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