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Reorientable electric dipoles and cooperative phenomena in human tooth enamel

  • Clinical Investigations
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Summary

A preliminary investigation of electric dipole reorientability in human tooth enamel (TE) in comparison to that in hydroxyapatite (OHAp) has been made with the fractional-polarization form of the thermally stimulated currents (TSC) method. The reorientable dipoles are the structural OH− ions. The OHAp exhibited compensation phenomena at 211.5°C and at 356°C which are associated here with the hexagonal form becoming quasi-statically stabilized and dynamically stabilized, respectively, against the monoclinic form. TE specimens were pretreated at various temperatures. All showed the onset of cooperative motions that could quasi-statically stabilize the hexagonal form at the same temperature, approximately 212°C, as did OHAp, even though the TE was already statically stabilized in the hexagonal form. Parts of the TSC spectra that did not conform to the 212°C compensation changed progressively with pretreatment temperature. Loss of incorporated H2O is identified as the most probable cause of most of these changes. This work shows considerable promise for TSC as a tool for further quantitative investigation of TE.

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Authors and Affiliations

  1. Departement de Physique, Faculté des Sciences, Université Mohammed V, Avenue Ibn, Batouta, Rabat, Morocco

    N. Hitmi

  2. Laboratoire de Physique des Solides, U.A., CNRS 74, Université Paul Sabatier, 31062, Toulouse Cedex, France

    E. Lamure-Plaino, A. Lamure & C. LaCabanne

  3. School of Physics, Georgia Institute of Technology, 30332, Atlanta, GA, USA

    R. A. Young

Authors
  1. N. Hitmi
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  2. E. Lamure-Plaino
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  3. A. Lamure
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  4. C. LaCabanne
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  5. R. A. Young
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Hitmi, N., Lamure-Plaino, E., Lamure, A. et al. Reorientable electric dipoles and cooperative phenomena in human tooth enamel. Calcif Tissue Int 38, 252–261 (1986). https://doi.org/10.1007/BF02556603

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  • DOI: https://doi.org/10.1007/BF02556603

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