Morphology and mineral composition of dentine of teeth with a wedge-shaped defect

Abstract

Wedge-shaped defects (WSD) are a common pathology with multi-factorial etiology. To study the features of the morphological structure and mineral composition of teeth dentine with a WSD, to determine their possible relationship with potential etiological factors. We examined 10 removed for orthodontic indications teeth with WSD from both jaws and their longitudinal sections with the help of a JSM-6490 LV focused beam electron microscope (scanning) with system of energy-dispersive X-ray microanalysis INCA Penta FETх3. We have identified the mineral composition of 231 areas of dentine in the incisal region (tubercle), equator, cervical area, surface junction forming a WSD and in 150 μm from it as a percentage of the weight amounts of carbon, oxygen, calcium, phosphorus, sodium, magnesium, sulfur, chlorine, zinc, potassium, aluminum. The dentine of the teeth with a WSD was characterized by heterogeneity of the morphological structure which depended on the topography, the characteristics of the pathological process and it was combined with the changes in the mineral composition. The most pronounced differences in the ultrastructure of dentine were revealed in the area of the surface junction forming the defect and they were found out at a distance of 150 μm from it. We determined a significant difference in the amount of chemical elements in dentine at the surface junction forming the defect and at a distance of 150 μm from it; in the area of incisal region (tubercle) (with wear facets and without them), p≤0.05. It is impossible to identify one etiological factor responsible for the occurence of WSD of the teeth. We think that their treatment and prevention will be more effective when understanding the morphological features of the structure and mineral composition of hard dental tissues.

Keywords

• morphology
• dentine
• non-carious cervical lesions
• scanning electron microscope
• chemical elements

References

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