Odontoclastic resorption of the superficial nonmineralized layer of predentine in the shedding of human deciduous teeth

Resorption by odontoclasts of a superficial nonmineralized layer of predentine that occurs in prior to the shedding of human deciduous teeth was studied by light and electron microscopy. As resorption of the tooth roots neared completion, multinucleate cells appeared on the predentine surface of the...

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Bibliographic Details
Published in:Cell and tissue research 1994-07, Vol.277 (1), p.19-26
Main Authors: SAHARA, N, OKAFUJI, N, TOYOKI, A, ASHIZAWA, Y, DEGUCHI, T, SUZUKI, K
Format: Article
Language:English
Subjects:
Acid Phosphatase - analysis
Biological and medical sciences
Cell Nucleus - ultrastructure
Cuspid
Dentin - cytology
Dentin - ultrastructure
Fundamental and applied biological sciences. Psychology
Histocytochemistry
Humans
Incisor
Molar
Mouth. Exocrine and endocrine salivary glands. Teeth. Esophagus
Osteoclasts - cytology
Osteoclasts - ultrastructure
Tooth Resorption
Tooth, Deciduous - cytology
Tooth, Deciduous - physiology
Tooth, Deciduous - ultrastructure
Vertebrates: digestive system
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Summary:Resorption by odontoclasts of a superficial nonmineralized layer of predentine that occurs in prior to the shedding of human deciduous teeth was studied by light and electron microscopy. As resorption of the tooth roots neared completion, multinucleate cells appeared on the predentine surface of the coronal dentine between the degenerated odontoblasts, excavated characteristic resorption lacunae in the nonmineralized predentine. These multinucleate cells had the same ultrastructural characteristics as odontoclasts and histochemical demonstration of tartrate-resistant acid phosphatase activity in the multinucleate cells revealed intense staining in numerous small granules identified as lysosomes. Occasionally, the multinucleate cells simultaneously resorbed both nonmineralized and calcospherite-mineralized matrix in the predentine. The study demonstrates that multinucleate odontoclasts can resorb nonmineralized predentine matrix in vivo, probably in the same way as they resorb demineralized organic matrix in the resorption zone underlying their ruffled border.
ISSN:0302-766X
1432-0878
DOI:10.1007/bf00303076