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    Higher fluorosis severity makes enamel less resistant to demineralization

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    TY - GEN T1 - Higher fluorosis severity makes enamel less resistant to demineralization UR - http://hdl.handle.net/20.500.12495/3643 PB - Karger AB - ER - @misc{20.500.12495_3643, author = {}, title = {Higher fluorosis severity makes enamel less resistant to demineralization}, year = {}, abstract = {}, url = {http://hdl.handle.net/20.500.12495/3643} }RT Generic T1 Higher fluorosis severity makes enamel less resistant to demineralization LK http://hdl.handle.net/20.500.12495/3643 PB Karger AB OL Spanish (121)
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    Author
    Marín, Lina María
    Aparecido Cury, Jaime
    Andaló Tenuta, Livia Maria
    Castellanos, Jaime Eduardo
    Martignon, Stefania 
    Date
    2016-07-27
    Published in
    Caries research, 1421-976X, Vol. 50, Nro. 4, 2016, p. 407-413
    Published for
    Karger
    URI
    http://hdl.handle.net/20.500.12495/3643
    Source's URL
    https://www.karger.com/Article/FullText/447270
    DOI
    https://doi.org/10.1159/000447270

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    Abstract
    Fluorotic teeth could either be more resistant or more susceptible to the caries process than sound ones due to their higher enamel fluoride concentration and higher porosity (subsurface hypomineralization), respectively; however, there is no consensus on this subject. In this study, a total of 49 human unerupted third molars presenting Thylstrup and Fejerskov (TF) fluorosis scores 0-4 were used. Two enamel slabs were obtained from each tooth. The rest of the tooth crown was powdered, and the enamel was separated from the dentine. In purified powdered enamel, the calcium (Ca), inorganic phosphate (Pi), and fluoride (F) concentrations were determined. The F concentration gradient throughout the enamel and in the enamel volume was determined in one slab. The other enamel slab was isolated with acid-resistant varnish, subjecting the exposed enamel surface half to a pH-cycling model to evaluate its demineralization resistance and to calculate the demineralization area. The nonexposed surface was used to determine the natural hypomineralization area found in fluorotic enamel and normalize the demineralization data. The hypomineralization and demineralization areas were assessed by cross-sectional microhardness. For statistical analyses, the data for TF1 and 2, and for TF3 and 4 were pooled. Concentrations of powered enamel Ca and Pi were not significantly different (p > 0.05) among groups TF0, TF1-2 and TF3-4, but a higher F concentration was found in fluorotic enamel (p < 0.05). Highly fluorotic teeth (TF3-4) presented a greater hypomineralization subsurface area and demonstrated lower demineralization resistance than sound enamel (p < 0.05). The findings suggest that a higher severity of fluorosis makes enamel less resistant to the caries process due to its greater subsurface mineral area exposed to demineralization and deeper acid diffusion through the enamel.
    Keywords
    Hypomineralization
    Dental caries resistance
    Dental enamel
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