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  • 1975-1979  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Relationships between fluoride in enamel, DMFT Index and fluorosis in high- and low-fluoride areas in South Africa (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Community dentistry and oral epidemiology 5 (1977), S. 0 
    Details
    ISSN: 1600-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: abstract The DMFT Index, degree of fluorosis (DEGF), and enamel fluoride concentration (F) were determined in 88 children living in a high- and 79 children living in a low-fluoride area in South Africa. The following interrelationships between these parameters were found: in both areas there was a significant negative correlation between log F and age; in the high-fluoride area there was a significant positive correlation between log F and DEGF; and in the combined data from the two areas there were significant correlations between log F and area, log F and age, and log F and DEGF, and a significant association between DEGF and area. There were no significant correlations between DMFT and log F and between DMFT and DEGF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0528.1977.tb01618.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Relationships among fluoride concentration in enamel, degree of fluorosis and caries incidence in a community residing in a high fluoride area (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 8 (1979), S. 0 
    Details
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract. The caries inhibitory effect of optimally fluoridated drinking water is well documented. Communities are often exposed to naturally fluoridated water with F content exceeding the optimal level. The purpose of this study was to determine the relationship between enamel fluoride, degree of fluorosis (DEGF) and caries incidence (DMFT) in an endemic fluoride area.Eighty-five 14- to 16-year-old children (37 males and 48 females) who were born and had been living continually in the town of Kenhardt in South Africa were selected for this study. The fluoride content of the common water supply is 3.2 ppm F. The DMFT and DEGF were determined clinically. Acid etch biopsies were carried out on both maxillary central incisors of each subject. Ca and F analysis were carried out and mass enamel expressed in μg and mass F in pg. Data transformations to logc, mass F (1nF), logc mass En (1nEn) and 〈inlineGraphic alt="inline image" href="urn:x-wiley:09042512:JOP224:JOP_224_mu1" location="equation/JOP_224_mu1.gif"/〉 were made. The 1nF values were corrected to a standarized depth of 10 μm (208.6 μg enamel equivalent mass) by covariance analysis. Correlations between the parameters 〈inlineGraphic alt="inline image" href="urn:x-wiley:09042512:JOP224:JOP_224_mu1" location="equation/JOP_224_mu1.gif"/〉, 1nF and DEGF were calculated, adjusting for the sex of the individual.The correlations were as follows: 〈displayedItem type="mathematics" xml:id="mu2" numbered="no"〉〈mediaResource alt="image" href="urn:x-wiley:09042512:JOP224:JOP_224_mu2"/〉 A positive association among the three parameters was established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0714.1979.tb01889.x
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Pyruvic acid as an etching agent (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 3 (1976), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Phosphoric acid at different concentrations has been extensively used as an etching agent to improve bonding of dental materials to enamel surfaces. Recently attention has been drawn to the possible use of polyfunctional organic acids as conditioning agents.The object of this investigation was to determine the optimal concentration of pyruvic acid as an etching agent. A commercial composite resin with an intermediary bonding system supplied with 37% H3PO4 as an etching agent was used as the control system. In addition, a comparative study was carried out to evaluate 37% H3PO4, 20% lactic acid and the optimal concentration of pyruvic acid as conditioning solutions.Etching enamel surfaces with 10% pyruvic acid resulted in the optimal tensile bond strength of the resin to etched enamel surfaces. The use of 10% pyruvic acid did not adversely affect the bond strength of the resin system when compared to enamel surfaces etched with 37% H3PO4 for the same time period. Significantly lower tensile bond strengths were recorded on enamel surfaces etched with 20% lactic acid. The rate and depth of etching obtained with 37% H3PO4 can be considerably reduced by using 10% pyruvic acid as the conditioning agent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1976.tb00950.x
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    A comparative study of three etching solutions: effects on enamel surface and adhesive-enamel interface (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 2 (1975), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The chemical treatment of enamel surfaces is an approach in obtaining increased bonding of dental materials to tooth surfaces. Three etching solutions commonly used at present are 50% H3PO4, 50% H3PO4 attenuated with 7% zinc oxide and 50% citric acid.The effects of these three conditioning solutions on normal and polished enamel surfaces and on the interfaces between untreated enamel and etched enamel surfaces were studied by scanning electron microscopy.The variable etching pattern observed with each of the acids made a comparative study difficult. This was further complicated by the dependence of the etching action on prism orientation on polished enamel surfaces. Additional factors that have to be considered are the presence of prismless enamel and perikymata.Surface profile recordings of polished and acid-etched polished enamel surfaces provided some quantitative measure of the etching action of the conditioning solutions.The 50% citric acid solution had the mildest etching action while 50% H3PO4 and 50% H3PO4 attenuated with 7% zinc oxide elicited comparable responses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1975.tb00912.x
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    Paper (German National Licenses)
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