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Crush absorbing energy of white spot lesions measured by indentation tests

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Abstract

White spot lesions are clinically detectable areas of demineralized enamel that often form during orthodontic treatment. Fluoride has been shown to prevent demineralization from occurring. Mechanical properties of white spot lesions are not well characterized. Bovine enamel slabs, with and without fluoride treatment, were placed under demineralization conditions. Through a series of microindentations at incremental loads, mechanical strength was measured using a novel method, specific volume absorbing energy (SVAE). SVAE is equal to work energy divided by the indentation volume. The supra-surface area (outermost 5 μm) of enamel slabs with fluoride demonstrated decreased mechanical strength compared to enamel slabs without fluoride. Fluoride may not impart protection over long periods of demineralization.

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Authors and Affiliations

  1. Division of Orthodontics, Department of Developmental and Surgical Sciences, University of Minnesota, Minneapolis, Minnesota, 55455, USA

    Alison M. Fallgatter

  2. Minnesota Dental Research Center for Biomaterials and Biomechanics, Department of Diagnostic and Biological Sciences, University of Minnesota, Minneapolis, Minnesota, 55455, USA

    Ching-Chang Ko

  3. 531 S. 7th Street, Bismarck, North Dakota, 58501, USA

    Alison M. Fallgatter

  4. University of North Carolina-Chapel Hill, Manning Dr. and Columbia St. CB #7450, Chapel Hill, NC, 27599-7450, USA

    Ching-Chang Ko

Authors
  1. Alison M. Fallgatter
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  2. Ching-Chang Ko
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Correspondence to Ching-Chang Ko.

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Fallgatter, A.M., Ko, CC. Crush absorbing energy of white spot lesions measured by indentation tests. Journal of Materials Research 21, 2052–2057 (2006). https://doi.org/10.1557/jmr.2006.0249

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  • DOI: https://doi.org/10.1557/jmr.2006.0249

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