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Initial dentin formation in human deciduous teeth

An electron microscope study

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Abstract

Dentin matrix formation is initiated as far as 11 μ deep in the prospective dental pulp. From this area, growth of the preodontoblast processes occurs toward the ameloblast. Process elongation is followed successively by 3 stages of dentin matrix formation: 1) fibril formation, 2) matrix maturation and 3) matrix calcification. These stages occur concurrently with differentiation of the odontoblasts. The bases of the odontoblast processes and distal surfaces of their cell bodies extrude cytoplasmic buds into the surrounding matrix. These function as initial sites of calcification.

Résumé

La formation de matrice dentinaire débute jusqu'à 11 microns de profondeur dans la pulpe dentaire en voie de développement. Une croissance de prolongements préodontoblastiques s'effectue de là en direction des améloblastes. L'allongement du prolongement est suivi de 3 stades de formation matricielle de la dentine: 1) formation de fibrilles, 2) maturation matricielle et 3) calcification de la matrice. Ces stades se déroulent simultanément avec différentiation d'odontoblastes. Les bases des prolongements odontoblastiques et les surfaces distales des corps cellulaires rejettent des bourgeons cytoplasmiques dans la matrice environnante, qui agissent comme des centres initiaux de calcification.

Zusammenfassung

Die Bildung der Dentinmatrix wird bis zu einer Tiefe von 11 μ in der zukünftigen Zahnpulpa angeregt. Aus dieser Stelle wachsen die Präodontoblasten-Fortsätze gegen den Amelo: blasten. Der Verlängerung der Fortsätze folgen nacheinander 3 Stadien der Matrixbildung-1. Fibrillenbildung; 2. Matrixreifung; 3. Matrixverkalkung. Während dieser Stadien differenzieren sich gleichzeitig die Odontoblasten. Die Basis der Odontoblasten-Fortsätze und die distale Oberfläche ihrer Zellkörper treiben Zytoplasmakeime in die umgebende Matrix vor. Diese fungieren als Ausgangsstellen der Verkalkung.

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Authors and Affiliations

  1. Department of Anatomy, University of Maryland, School of Dentistry, 21201, Baltimore, Maryland, USA

    R. F. Sisca &  D. V. Provenza

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  1. R. F. Sisca
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  2. D. V. Provenza
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Additional information

This study was supported by PHS Research Grant HD-01842-04, National Institute of Child Health and Human Development.

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Sisca, R.F., Provenza, D.V. Initial dentin formation in human deciduous teeth. Calc. Tis Res. 9, 1–16 (1972). https://doi.org/10.1007/BF02061941

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