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Title: Large scale study of tooth enamel

Abstract

Human tooth enamel contains traces of foreign elements. The presence of these elements is related to the history and the environment of the human body and can be considered as the signature of perturbations which occur during the growth of a tooth. A map of the distribution of these traces on a large scale sample of the population will constitute a reference for further investigations of environmental effects. One hundred eighty samples of teeth were first analysed using PIXE, backscattering and nuclear reaction techniques. The results were analysed using statistical methods. Correlations between O, F, Na, P, Ca, Mn, Fe, Cu, Zn, Pb and Sr were observed and cluster analysis was in progress. The techniques described in the present work have been developed in order to establish a method for the exploration of very large samples of the Belgian population.

Authors:
; ;
Publication Date:
Research Org.:
Faculte's Universitaires de Namur, Namur, Belgium
OSTI Identifier:
5484026
Report Number(s):
CONF-801111-
Journal ID: CODEN: IETNA
Resource Type:
Conference
Resource Relation:
Journal Name: IEEE Trans. Nucl. Sci.; (United States); Journal Volume: NS-28:2; Conference: 6. conference on application of accelerators in research and industry, Denton, TX, USA, 3 Nov 1980
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CALCIUM; PIXE ANALYSIS; COPPER; FLUORINE; IRON; LEAD; MANGANESE; OXYGEN; PHOSPHORUS; SODIUM; STRONTIUM; TEETH; CHEMICAL ANALYSIS; ZINC; BACKSCATTERING; BELGIUM; NUCLEAR REACTIONS; PUBLIC HEALTH; SAMPLING; STATISTICS; TRACE AMOUNTS; ALKALI METALS; ALKALINE EARTH METALS; DIGESTIVE SYSTEM; ELEMENTS; EUROPE; HALOGENS; MATHEMATICS; METALS; NONDESTRUCTIVE ANALYSIS; NONMETALS; ORAL CAVITY; SCATTERING; TRANSITION ELEMENTS; WESTERN EUROPE; X-RAY EMISSION ANALYSIS 400103* -- Radiometric & Radiochemical Procedures-- (-1987)

Citation Formats

Bodart, F., Deconninck, G., and Martin, M.Th. Large scale study of tooth enamel. United States: N. p., 1981. Web.
Bodart, F., Deconninck, G., & Martin, M.Th. Large scale study of tooth enamel. United States.
Bodart, F., Deconninck, G., and Martin, M.Th. 1981. "Large scale study of tooth enamel". United States. doi:.
@article{osti_5484026,
title = {Large scale study of tooth enamel},
author = {Bodart, F. and Deconninck, G. and Martin, M.Th.},
abstractNote = {Human tooth enamel contains traces of foreign elements. The presence of these elements is related to the history and the environment of the human body and can be considered as the signature of perturbations which occur during the growth of a tooth. A map of the distribution of these traces on a large scale sample of the population will constitute a reference for further investigations of environmental effects. One hundred eighty samples of teeth were first analysed using PIXE, backscattering and nuclear reaction techniques. The results were analysed using statistical methods. Correlations between O, F, Na, P, Ca, Mn, Fe, Cu, Zn, Pb and Sr were observed and cluster analysis was in progress. The techniques described in the present work have been developed in order to establish a method for the exploration of very large samples of the Belgian population.},
doi = {},
journal = {IEEE Trans. Nucl. Sci.; (United States)},
number = ,
volume = NS-28:2,
place = {United States},
year = 1981,
month = 4
}

Conference:
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  • Previous investigators have reported that the radiation-induced EPR signal intensity in compact or cortical bone increases up to a factor of two with decreasing photon energy for a given absorbed dose. If the EPR signal intensity was dependent on energy, it could limit the application of EPR spectrometry and the additive reirradiation method to obtain dose estimates. We have recently shown that errors in the assumptions governing conversion of measured exposure to absorbed dose can lead to similar [open quotes]apparent[close quotes] energy-dependence results. We hypothesized that these previous results were due to errors in the estimated dose in bone, rathermore » than the effects of energy dependence per se. To test this hypothesis we studied human adult cortical bone from male and female donors ranging in age from 23 to 95 years, and bovine tooth enamel, using 34 and 138 keV average energy X-ray beams and [sup 137]Cs (662 keV) and [sup 60]Co (1250 keV) [gamma] rays. In a femur from a 47-year-old male (subject 1), there was a difference of borderline significance at the [alpha] = 0.05 level in the mean radiation-induced hydroxyapatite signal intensities as a function of photon energy. No other statistically significant differences in EPR signal intensity as a function of photon energy were observed in this subject, or in the tibia from a 23-year-old male (subject 2) and the femur from a 75-year-old female (subject 3). However, there was a trend toward a decrease (12-15%) in signal intensity at the lowest energy compared with the highest energy in subjects 1 and 3. Further analysis of the data from subject 1 revealed that this trend, which is in the opposite direction of previous reports but is consistent with theory, is statistically significant. There were no efforts of energy dependence in the tooth samples. 16 refs., 7 figs., 5 tabs.« less
  • Micro-PIXE (proton-induced X-ray emission) analysis was performed on unfixed and anhydrously prepared sections from developing enamel and dentin from hamsters injected with a single dose of 20 mg NaF/kg body weight. Fluoride, apart from inducing the formation of the characteristic paired response in the enamel (i.e., a hyper- followed by a hypomineralized band in the secretory enamel), also induces the formation of sub-ameloblastic cystic lesions under the transitional and early secretory enamel accompanied by relatively intense hypermineralization of the underlying cystic enamel surface. These cystic lesions, however, were only found to be associated with certain isolated populations of these cells.more » In addition, these lesions were restricted to the smooth surfaces of the tooth germ only. Cystic lesions such as those seen under the transitional and early secretory ameloblasts were not observed under the fully secretory or maturation stage ameloblasts. Why fluoride induces the formation of cystic lesions in some ameloblast populations while other cells in the same stage of development apparently remain unaffected, is a matter which needs further investigation.« less
  • Improving our knowledge of the morphology, composition and properties of the dentin, enamel, and the dentin-enamel junction (DEJ) is vital for the development of improved restorative materials and clinical placement techniques. Most studies of dental tissues have used light microscopy for characterization. In our investigation, the spectroscopic properties of normal and non-carious transparent human root dentin, and the dentin-enamel junction were investigated using emission imaging microscopy, and micro-spectroscopy. Experimental results reveal new information on the structural and biochemical characteristics of these dental tissues.
  • No abstract prepared.