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X-ray microanalysis of human cementum.

Marco Antonio Alvarez-Pérez1, Octavio Alvarez-Fregoso, Jaime Ortiz-López

  • 1Laboratorio de Biología Celular y Molecular, Facultad de Odontología, UNAM, Cd. Universitaria, Coyoacán, México D.F. 04510, México.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|August 5, 2005
PubMed
Summary

This study analyzed mineral content in human cementum, finding distinct calcium-to-phosphorus ratios and magnesium distribution. These variations suggest magnesium plays a key role in regulating cementum metabolism.

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Area of Science:

  • Biomineralization
  • Dental Enamel and Cementum Research
  • Materials Science in Dentistry

Background:

  • Cementum composition varies across tooth regions.
  • Understanding mineral distribution is crucial for cementum biology.

Purpose of the Study:

  • To investigate mineral content (calcium, phosphorus, magnesium) along the entire length of human cementum.
  • To compare mineral concentration profiles and ratios (Ca/P, Mg/Ca) from the cemento-enamel junction to the root apex.

Main Methods:

  • Energy dispersive x-ray microanalysis was used on five impacted human teeth.
  • Electron probe analysis determined mineral content on the external cementum surface.
  • Atomic percent ratios (Ca/P, Mg/Ca) were calculated and compared across different cementum regions.

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Main Results:

  • The Ca/P ratio was highest at the cemento-enamel junction (1.8-2.2) and decreased towards the root apex.
  • Acellular extrinsic fiber cementum (AEFC) showed a Ca/P ratio of 1.65, dropping to 1.3 at the root's fulcrum.
  • Magnesium levels peaked (Mg/Ca ratio 1.3-1.4 at.%) at the root's fulcrum, inversely correlating with decreasing Ca/P ratios.

Conclusions:

  • Significant compositional differences exist between acellular extrinsic fiber cementum (AEFC) and cellular mixed stratified cementum.
  • Magnesium distribution patterns suggest a regulatory role in human cementum metabolism.