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PubMed1997

Quantitative electron-spectroscopic diffraction (ESD) and electron-spectroscopic imaging (ESI) analyses of dentine mineralisation in rat incisors.

Primary crystal formations in all hard tissues are, according to our investigations, Ca-phosphate chains composed of nanometer sized particles (dots) which develop along the matrix macromolecules. In circumpulpal dentine the centre-to-centre distances between the dots inside the chains reflect the distances between the crystal nucleating sites ("active sites") along the collagen matrix macromolecule. The centre-to-centre distances at the surface of the mineralised collagen fibrils probably reflect the distances between nucleating sites of noncollagenous proteins attached to collagen. These needle-like chains of dots coalesce in lateral directions to form ribbon-like crystallites. The morphological results are supported by correlated small area diffraction studies in the same regions of dentine. We have found that the first appearing Bragg-reflection has a lattice spacing value of 0.388 nm, which corresponds to the (111) apatite value. For the earliest crystal formations the intensity of the (002) reflection is higher than that of the (300)-reflection. A maximum of the net-signal-intensity ratio of the (002) to (300) Bragg-reflection appears at the mineralisation front. This peak repeats with decreasing height 3 to 5 times with a distance range of about 8-16 microm through the whole dentine zone, which corresponds to the distances of the incremental lines, called "von Ebner lines".

Animals↗
PubMed1993

The structure of dentine after the injection of strontium chloride by backscattered electron imaging in the scanning electron microscope.

The subcutaneous injection of 0.5 ml of 20% aqueous strontium chloride produced a distinct calciotraumatic response in rat incisor dentine. In both the labial and lingual dentine this consisted of an unmineralized layer comprising continuous interglobular spaces. Lingually this unmineralized layer was sharply defined and about 1-2 microns in width but labially it was more irregular, diffuse and difficult to measure. Labially and lingually the dentine formed after the unmineralized layer hypomineralized in comparison to the rest of the dentine. Within the hypomineralized labial dentine a diffuse, more intensely hypomineralized layer was often present. The appearance of the unmineralized layer probably reflects the differences in structure between labial and lingual dentine, that is, small linear calcospherites lingually and large irregular calcospherites labially.

Animals↗