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The distribution of magnesium in developing rat incisor dentin
J Steinfort1, F C Driessens, H J Heijligers
1Department of Periodontology, Academic Centre for Dentistry Amsterdam (ACTA), The Netherlands.
Journal of Dental Research
|March 1, 1991
Summary
Magnesium levels in rat incisor dentin increase during maturation, particularly in cementum-related dentin (CRD). This study reveals magnesium’s dynamic role in dentin development and its relationship with calcium and phosphate.
Area of Science:
- Biomineralization
- Dental Research
- Materials Science
Background:
- Rat incisor dentin exhibits heterogeneous magnesium distribution.
- Cementum-related dentin (CRD), especially incisally, is magnesium-rich.
Purpose of the Study:
- Investigate magnesium content changes during dentin maturation.
- Analyze magnesium distribution in rat incisor dentin.
Main Methods:
- Electron microprobe analysis of Ca, Mg, and P signals.
- Preparation of rat incisor cross-sections at apical, middle, and incisal levels.
Main Results:
- Mg/P molar ratio higher in CRD than enamel-related dentin (ERD).
- Mg/P ratio increases from apex to incisal edge.
- Mg/P increases from peripheral to central dentin layers in incisal sections.
- Mg/P ratio ranges from 0.07 to 0.33; Ca/P ratio fluctuates from 1.48 to 1.15.
- High negative correlation between Mg/P and Ca/P ratios (r = -0.97).
Conclusions:
- Magnesium content increases during dentin maturation.
- Magnesium likely replaces calcium and binds to phosphate in dentin.