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  • 1980-1984  (9)
  • 1960-1964  (2)
  • 1955-1959  (4)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Contact stomatitis and dermatitis to nickel and palladium (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 11 (1984), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 17 subjects were tested epicutaneously with 22 materials, including Ni, Pd, Cr and Co. 5 subjects with a positive allergic skin reaction to Ni were tested with a pure metallic nickel plate 3 × 5 mm, which was attached to the buccal side of one lower premolar. These 5 subjects all developed local allergic contact stomatitis on the mucosa of the cheek adjacent to the metal plate. This was confirmed histologically. The same oral test with pure metallic palladium gave no reaction in subjects with a positive patch test. A control group gave no reactions to the metal plates. Allergic contact stomatitis was diagnosed with the help of both clinical and histological examinations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1984.tb01013.x
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    Paper (German National Licenses)
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  • 2
    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
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    Paper (German National Licenses)
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  • 3
    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
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The curing pattern of photo-initiated dental composites (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 7 (1980), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In this study the curing of photo-initiated composites was investigated. After irradiation, the material in an experimental cavity could be divided into three zones: zone A which showed physical properties comparable to those of chemical initiated composites, zone B which was markedly softer than the first one, and zone C which showed no signs of curing at all. The location of the zones was dependent on the energy of the u.v. radiation, the exposure time, the storage time, and the storage conditions. The uncured material of zone C showed no tendency to set. The clinical implications of the observations are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1980.tb00455.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The resistance of superficially sealed enamel to wear and carious attack in vitro (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 7 (1980), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The resistance to wear and carious attack has been investigated in vitro for enamel that has been subjected to several stages of the sealing procedure: etching, etching and remineralization in whole saliva and etching followed by sealing. After partial mechanical removal of the sealant, the remaining surface enamel proved to be resistant to carious attack as long as the resin tags were present. An estimation is made of the thickness of the affected layer. Pretreatment with monofluorophosphate has proved to influence the extent of the histological changes due to etching. A discussion on these phenomena is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1980.tb00448.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Age of the Cambrian System (1960)
    [s.l.] : Nature Publishing Group
    Nature 187 (1960), S. 1020-1021 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] (1) Statements that the brannerite occurrences are overlain by Precambrian sediments of the Adelaide System are incorrect. The nearest sediments are six or seven miles away4. In these Precambrian strata, pebbles of granite are found which are akin to the adamellite forming the country-rock of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1871020a0
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The Geological Time-Scale (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1473-1473 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1841473a0
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    How old is the Cambrian System? (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 768-769 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The dating of the Cambrian system has hitherto been based largely upon determinations of the age of Swedish kolm, a mode of calibration which (as the Oxford authors correctly conclude) is very much open to criticism. Kolm is a uranium-rich hydrocarbon occurring within the trilobite sub-zones ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/183768a0
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Age of the Mineralization of the Witwatersrand (1955)
    [s.l.] : Nature Publishing Group
    Nature 175 (1955), S. 606-606 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] These arguments based upon mass-spectrographic analyses form the sole response of Jijouth African scientists to the criticisms of the placer theory which I have published in recent years4. A refutation of Louw's conclusions awaits printing elsewhere5 ; and since repetitive publication is to be ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/175606a0
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    The Geological Time-Scale (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1310-1310 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The time-scale proposed by Dr. K. I. Mayne1 and his colleagues puts back the date of the uppermost Cambrian strata from 450 to 650 million years. The structure of evidence forming the foundation for this conclusion has, deservedly, been demolished by Prof. J. L. Kulp3 and his associates, of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1841310a0
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    Paper (German National Licenses)
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