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Crush absorbing energy of white spot lesions measured by indentation tests

Published online by Cambridge University Press:  01 August 2006

Alison M. Fallgatter  and
Ching-Chang Ko
Alison M. Fallgatter
Affiliation:
Division of Orthodontics, Department of Developmental and Surgical Sciences, University of Minnesota, Minneapolis, Minnesota 55455and Minnesota Dental Research Center for Biomaterials and Biomechanics, Department of Diagnostic and Biological Sciences, University of Minnesota, Minneapolis, Minnesota 55455
Ching-Chang Ko
Affiliation:
Minnesota Dental Research Center for Biomaterials and Biomechanics, Department of Diagnostic and Biological Sciences, University of Minnesota, Minneapolis, Minnesota 55455
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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.

Keywords

HardnessSuperplasticityTissue
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 8 , August 2006 , pp. 2052 - 2057
Copyright
Copyright © Materials Research Society 2006

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