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  • 1980-1984  (2)
  • 1960-1964
  • 1981  (2)
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  • 1980-1984  (2)
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    Structural changes in composite surface material after dry polishing (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 8 (1981), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of this study was to investigate the properties of composite materials that had been heated to temperatures which may occur during dry polishing. Bulk composite material was submitted to thermal analysis from R.T. to 200°C. Two distinct stages of thermal reaction in this range could be identified. One at approximately 70°C, which could be related to a further initiating of unreacted groups, and one above 100°C, which could be related to the glass transition. The glass transition was also observed microscopically. Hardness measurements were carried out on the warm material at different temperatures as well as on the material being cooled down to R.T. With temperature rise, a continuous increase in hardness and abrasion resistance could be demonstrated. The observed phenomena for bulk material are related to the properties measured on dry polished surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1981.tb00517.x
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of temperature on some physical properties of dental composites (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 8 (1981), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In this study diametral tensile strength and microhardness of composites were investigated in relation to various temperatures during curing. It has been demonstrated that temperatures elevated up to 60°C can improve the mechanical properties considerably. Also the stability of the resin system in aggressive environments was improved due to more efficient cross-linking. Thermal analysis of the material showed an endothermic reaction between 60 and 70°C that is believed to be responsible for the initiation of the extra cross-linking. Heating of composite fillings during clinical use is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1981.tb00505.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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