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  • 1
    Electronic Resource
    Electronic Resource
    Effect of primers on bonding agent polymerization (1998)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 25 (1998), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The aim of the present study was to evaluate the effect of primers on the polymerization of bonding agent. We measured the degree of conversion (radical production) and mechanical properties (surface hardness and direct tensile strength) of various adhesives/primers mixed at different ratios and the effect of varying the visible-light curing time. With and without primer treatment, the tensile bond strength of adhesive resin to micacious glass ceramic and human enamel was measured. After the tensile bond test, using the Image Capture System, the failure patterns of adhesive resin bonded to micacious glass-ceramic were analysed. The results show that the mixtures containing the higher amounts of primer yielded a lower degree of conversion and inferior mechanical properties when compared with the mixtures containing a lower proportion of primer, except in the experimental bonding system. The adhesive/primer mixtures inhibited free radical polymerization. The value for the Knoop hardness number and the direct tensile strength of the adhesive/primer mixtures were significantly decreased compared with those of the adhesive bonding agent alone with no primer added. The tensile bond strength of adhesive resin bonded to micacious glass-ceramic or human enamel without primer treatment was significantly greater than that of adhesive resin with primer treatment in certain cases. Most of the fractures of ceramic surfaces were cohesive (within resins) and/or interface (at the ceramic surface) failure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.1998.00309.x
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of CO^2^-"3 ion on the formation of octacalcium phosphate at pH 7.4 and 37^oC
    Amsterdam : Elsevier
    Journal of Crystal Growth 135 (1994), S. 229-234 
    Details
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0248(94)90745-5
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Precipitation of octacalcium phosphate at 37^oC and at pH 7.4: in relation to enamel formation
    Amsterdam : Elsevier
    Journal of Crystal Growth 112 (1991), S. 467-473 
    Details
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0248(91)90325-Y
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Sintering mechanism of hydroxyapatite by addition of lithium phosphate (1991)
    Springer
    Journal of materials science 2 (1991), S. 149-152 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The sintering mechanism of hydroxyapatite (HAp) by addition of lithium phosphate (Li3PO4) has been investigated. Using the X-ray diffraction method, HAp was confirmed to decompose into β-Ca3(PO4)2 (β-TCP) by addition of Li3PO4. The measurement of shrinkage rate by the isothermal firing made it clear that the densification process at the initial stage of sintering took place in the presence of liquid phase. Furthermore, the examination of the phase diagram on the binary system β-TCP-Li3PO4 revealed that there was an eutectic point at 1010°C in the composition of 60 wt% Li3PO4. From these evidences, we concluded that β-TCP produced by the decomposition of a part of HAp has formed the liquid phase by reacting with Li3PO4 above 1010°C, and that this liquid phase has largely promoted the densification by the rearrangement of HAp particles at the initial stage of sintering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692973
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  • 5
    Electronic Resource
    Electronic Resource
    Pyrolysis-gas chromatography of carbonate apatites used for sintering (1995)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 29 (1995), S. 1451-1457 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Gas chromatography was employed to quasi-continuously determine the amount of carbon dioxide that evolved from carbonate apatite specimens during sintering. Assuming that the carbonate in the specimens decomposed to carbon dioxide on a mole-for-mole basis, the determination of the carbon dioxide evolved allowed for the determination of the amount of carbonate that remained in the specimens during different stages of sintering. Previously, this measurement could be carried out only after sintering was completed. Comparison of data obtained from specimens compacted isostatically at 600 MPa for sintering with powder specimens indicated that the amount of carbonate remaining in the sintered apatite mass strongly depended on heating rates, heating temperatures, and holding-time intervals. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820291117
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