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The Distribution of Magnesium in Developing Rat Incisor Dentin
J. Steinfort
Experimental Oral Biology Group, Department of Periodontology, Academic Centre for Dentistry Amsterdam (ACTA), Louwesweg 1, 1066 EA Amsterdam, The Netherlands
F.C.M. Driessens
Department of Oral Biomaterials, Faculty of Dentistry, Catholic University, Nijmegen
H.J.M. Heijligers
Department of Physical Chemistry, University of Technology, Eindhoven
W. Beertsen
Experimental Oral Biology Group, Department of Periodontology, Academic Centre for Dentistry Amsterdam (ACTA), Louwesweg 1, 1066 EA Amsterdam, The Netherlands
Previous studies have shown that rat incisor dentin contains a considerable amount of magnesium that is distributed heterogeneously. The cementum-related dentin, especially its incisal portion, is richest in magnesium. It was the purpose of the present study to investigate the changes that occur in the magnesium content during dentin maturation.
Cross-sections were prepared from rat incisors at the apical, middle, and incisal levels. By means of an electron microprobe, tracings were made of the Ca-, Mg-, and P- signal frequencies. Comparison of corresponding dentin layers within and between the cross-sections showed that the Mg/P molar ratio was always higher in the cementum-related dentin (CRD) than in the enamel-related dentin (ERD) and increased from the apex toward the incisal edge. Especially in the incisal cross-section, an increase in Mg/P was found from the older (peripheral) toward the younger (central) dentin layers. As the Mg/P ratio varied from 0.07 to 0.33, the Ca/P ratio was found to fluctuate from 1.48 to 1.15. The two ratios appeared to be highly correlated (r = -0.97; p<0.001), suggesting that Mg replaces Ca and is bound to phosphate.
REFERENCES
- Bastin, G.F. and Heijligers, H.J.M. (1990): Quantitative Electron Probe Microanalysis of Ultra-Light Elements (Boron-Oxygen), Scanning 12:225-236.
- Beertsen, W. and Niehof, A. (1986): Root-Analogue Versus Crown-Analogue Dentin: A Radioautographic and Ultrastructural Investigation of the Mouse Incisor, Anat Rec 215:106-118.[CrossRef][Medline]
[Order article via Infotrieve]
- Beertsen, W.; Niehof, A.; and Everts, V. (1985): Effects of 1-hydroxyethylidene-1,1-bisphosphonate (HEBP) on the Formation of Dentin and the Periodontal Attachment Apparatus in the Mouse, J Anat 174:83-103.[CrossRef]
- Driessens, F.C.M. and Verbeeck, R.M.H. (1985): Dolomite as a Possible Magnesium-containing Phase in Human Tooth Enamel, Calcif Tissue Int 37:376-380.[CrossRef][Medline]
[Order article via Infotrieve]
- Featherstone, J.D.B.; Mayer, I.; Driessens, F.C.M.; Verbeeck, R.M.H.; and Heijligers, H.J.M. (1983): Synthetic Apatites Containing Na, Mg, and CO3 and Their Comparison with Tooth Enamel Mineral, Calcif Tissue Int 35:169-171.[CrossRef][Medline]
[Order article via Infotrieve]
- Glick, P.L. (1981): Identification of Mineral Fractions in Developing Rat Incisors. In: The Chemistry and Biology of Mineralized Connective Tissues, A. Veis, Ed., New York: Elsevier North Holland, pp. 309-311.
- Hiller, C.H.; Robinson, C.; and Weatherell, J.A. (1975): Variations in the Composition of Developing Rat Incisor Enamel, Calcif Tissue Res 18:1-12.[CrossRef][Medline]
[Order article via Infotrieve]
- Hohling, H.J.; Hall, T.A.; Boyde, A.; and Von Rosensteil, A.P. (1968): Combined Electron Probe and Electron Diffraction Analysis of Prestages and Early Stages of Dentine Formation in Rat Incisors, Calcif Tissue Res 2: suppl., 5-5A.[Medline]
[Order article via Infotrieve]
- Johnson, A.R. (1972): Strontium, Calcium, Magnesium , and Phosphorus Content of Rat Incisors as Determined by Electron Microprobe Analysis, J Dent Res 51:115-121.
- Robinson, C.; Hallsworth, A.S.; and Kirkham, J. (1984): Distribution and Uptake of Magnesium by Developing Deciduous Bovine Incisor Enamel, Arch Oral Biol 29:479-482.[CrossRef][Medline]
[Order article via Infotrieve]
- Quint, P.; Althoff, J.; Hohling, H.J.; Boyde, A.; and Laabs, W.A. (1980): Characteristic Molar Ratios of Magnesium, Carbon Dioxide, Calcium and Phosphorus in the Mineralizing Fracture Callus and Predentine , Calcif Tissue Int 32:257-261.[CrossRef][Medline]
[Order article via Infotrieve]
- Shaw, J.H. and Yen, P.K.-J. (1972): Sodium, Potassium, and Magnesium Concentrations in the Enamel and Dentin of Human and Rhesus Monkey Teeth, J Dent Res 51:95-101.[Abstract/Free Full Text]
- Steinfort, J.; Van Den Bos, T.; and Beertsen, W. (1989): Differences between Enamel-related and Cementum-related Dentin in the Rat Incisor with Special Emphasis on the Phosphoproteins, J Biol Chem 264:2840-2845.[Abstract/Free Full Text]
- Steinfort, J.; Deblauwe, B.M.; and Beertsen, W. (1990): The Inorganic Components of Cementum- and Enamel-related Dentin in the Rat Incisor, J Dent Res 69:1287-1292.[Abstract/Free Full Text]
- Terpstra, R.A. and Driessens, F.C.M. (1986): Magnesium in Tooth Enamel and Synthetic Apatites, Calcif Tissue Int 39:348-354.[CrossRef][Medline]
[Order article via Infotrieve]
- Tochon-Danguy, H.J.; Geoffrey, M.; Boivin, G.; and Baud, C.A. (1978): Mineral Substance of Bone Tissue and of Experimental Cutaneous Calcinosis in Rats: Chemical Analysis and ESR Study, Calcif Tissue Res 26:259-265.[Medline]
[Order article via Infotrieve]
Journal of Dental Research, Vol. 70, No. 3,
187-191 (1991)
DOI: 10.1177/00220345910700030601
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