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  • 1
    Electronic Resource
    Electronic Resource
    Plaque formation on surface modified dental implants (2001)
    Copenhagen : Munksgaard International Publishers
    Clinical oral implants research 12 (2001), S. 0 
    Details
    ISSN: 1600-0501
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Bacterial adhesion on titanium implant surfaces has a strong influence on healing and long-term outcome of dental implants. Parameters like surface roughness and chemical composition of the implant surface were found to have a significant impact on plaque formation. The purpose of this study was to evaluate the influence of two physical hard coatings on bacterial adhesion in comparison with control surfaces of equivalent roughness. Two members of the oral microflora, Streptococcus mutans and Streptococcus sanguis were used. Commercially pure titanium discs were modified using four different surface treatments: physical vapour deposition (PVD) with either titanium nitride (TiN) or zirconium nitride (ZrN), thermal oxidation and structuring with laser radiation. Polished titanium surfaces were used as controls. Surface topography was examined by SEM and estimation of surface roughness was done using a contact stylus profilometer. Contact angle measurements were carried out to calculate surface energy. Titanium discs were incubated in the respective bacterial cell suspension for one hour and single colonies formed by adhering bacteria were counted by fluorescence microscopy. Contact angle measurements showed no significant differences between the surface modifications. The surface roughness (Ra) of all surfaces examined was between 0.14 and 1.00 μm. A significant reduction of the number of adherent bacteria was observed on inherently stable titanium hard materials such as TiN and ZrN and thermically oxidated titanium surfaces compared to polished titanium. In conclusion, physical modification of titanium implant surfaces such as coating with TiN or ZrN may reduce bacterial adherence and hence improve clinical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0501.2001.120601.x
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  • 2
    Electronic Resource
    Electronic Resource
    Synthese zweikerniger Platin-Verbindungen mit 1,4-Phenylen-Brücke (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 759-761 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses of Dinuclear Platinum Compounds Containing a 1,4-Phenylene BridgeSyntheses of 1,4-phenylene bridged dinuclear platinum-organic compounds dichlorobis-(1,2,5,6-η4-1,5-cyclooctadiene)(μ-1,4-phenylene)diplatinum(II) (1), all-trans-dichloro(μ-1,4-phenylene)tetrakis(tributylphosphane)diplatinum(II) (3), and all-trans-diphenyl(μ-1,4-phenylene)tetrakis(tributylphosphane)diplatinum(II) (2) are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190235
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesen von cis- und trans-Bis(X-phenyl)- bis(tributylphosphan)platin(II)-Verbindungen mit Substituenten von π-Akzeptor-Charakter in den platingebundenen Phenyl-Ringen (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4347-4355 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of cis- and trans-Bis(X-phenyl)bis(tributylphosphane)platinum(II) Compounds with Substituents of π-Acceptor Character in the Platinum-Bound Phenyl RingsA new synthetic route to the title compounds via cis-bis(4-bromophenyl)bis(tributylphos-phane)platinum(II) (cis-2a) and cis-bis(4-lithiophenyl)bis(tributylphosphane)platinum(II) (cis-3) is described. By this method the compounds cis-{Pt[P(nBu)3]2[C6H4X-(4)]2} (X = D, Si(CH3)3, CO2H, CO2CH3, CN, COC6H5) (cis-2b-g) and trans-{Pt[P(nBu)3]2[C6H4I-(4)]2} (trans-2h) have been synthesized; cis-2a-c, e-g have been transformed into their trans- isomers trans-2a-c, e-g by catalysis with tetrabutylammonium iodide.
    Notes: Ein neues Verfahren zur Synthese der Titel-Verbindungen über cis-Bis(4-bromphenyl)-bis(tributylphosphan)platin(II) (cis-2a) und cis-Bis(4-lithiophenyl)bis(tributylphosphan)-platin(II) (cis-3) wird beschrieben. Mit dieser Methode wurden die Verbindungen cis-{Pt[P(n-Bu)3]2[C6H4X- (4)]2} (X = D, Si(CH3)3, CO2H, CO2CH3, CN, COC6H5) (cis-2b-g) und trans-{Pt[P(n-Bu)3]2[C6H4I- (4)]2} (trans-2h) synthetisiert; aus cis-2a-c, e-g wurden unter Katalyse mit Tetrabutylammoniumiodid die zugehörigen trans-Isomeren trans-2a-c, e-g erhalten.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181107
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesen substituierter cis- und trans-Bis(phenyl)bis(tri-n-butylphosphan)platin(II)-Verbindungen (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4653-4664 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Substituted cis- and trans-Bis(phenyl)bis(tri-n-butylphosphane)platinum(II) CompoundsSyntheses of the compounds cis- and trans-{Pt[P(n-C4H9)3]2 (X-C6H4)2} (X = H, 4-CH3O, 4-(CH3)3C, 4-CF3, 4-Br, 4-Cl, 4-(CH3)3Si, 4-C6H5, 4-D, 2-D) (cis- and trans-3a-j), cis- and trans-{Pt[P(n-C4H9)3]2 (C6X5)2} (X = D, F) (cis- and trans-3k, I), trans-{Pt[P(n-C4H9)3]2 (X-C6H4)Cl} (X = H, 4-CH3O, 4-(CH3)3C, 4-CF3) (trans-4a-d) and trans-{Pt[P(n-C4H9)3]2 (4-X-C6H4)-(4-Y-C6H4)} (X/Y = Br/(CH3)3C, Br/CH3O, Br/CF3, Cl/CF3, CH3O/CF3, (CH3)3C/CN, CH3O/CN, CF3/CN) (trans-5a-h) are described.
    Notes: Synthesen der Verbindungen cis- und trans-{Pt[P(n-C4H9)3]2 (X-C6H4)2} (X = H, 4-CH3O, 4-(CH3)3C, 4-CF3, 4-Br, 4-Cl, 4-(CH3)3Si, 4-C6H5, 4-D, 2-D) (cis- und trans-3a-J), cis- und trans-{Pt[P(n-C4H9)3]2 (C6X5)2) (X = D, F) (cis- und trans-3k, I), trans-{Pt[P(n-C4H9)3]2 (X-C6H4)Cl} (X = H, 4-CH3O, 4-(CH3)3C, 4-CF3) (trans-4a-d)-sowie trans-{Pt[P(n-C4H9)3]2 (4-X-C6H4)-(4-Y-C6H4)} (X/Y = Br/(CH3)3C, Br/CH3O, Br/CF3, Cl/CF3, CH3O/CF3, (CH3)3C/CN, CH3O/CN, CF3/CN) (trans-5a-h) werden beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181202
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  • 5
    Electronic Resource
    Electronic Resource
    The anodic dissolution of dental amalgams studied with abrasive stripping voltammetry (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 339-346 
    Details
    ISSN: 1040-0397
    Keywords: Abrasive stripping voltammetry ; dental amalgam ; corrosion ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The recently described technique abrasive stripping voltammetry was used to study the corrosion behavior of five commercial dental amalgams. Abrasive stripping voltammetry of these amalgams reveals details of the anodic dissolution of the alloys that are not accessible by other methods. Systematic studies of Sn—Hg alloys, Sn—Ag alloys, and dental amalgams lead to a method that allows the identification of the γ2-phase in dental amalgams. It can be shown that the non-γ2 amalgams have a higher stability than γ2-containing amalgams only in solutions of very low complexation ability. In cases of more aggressive solutions such as lemon juice, non-γ2 and conventional amalgams exhibit identical behavior during the anodic oxidation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040312
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