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The function and structure of the marsupial enamel.
1Department of Anatomy, Nihon University School of Dentistry at Matsudo, Chiba, Japan.
Connective Tissue Research
|November 4, 2000
Summary
This study reveals that enamel tubules in opossum teeth are formed by odontoblast processes, facilitating active transport from the dentin to the enamel surface. These findings clarify enamel structure and tubule function in marsupials.
Area of Science:
- Zoology
- Developmental Biology
- Biomineralization
Background:
- Enamel tubules, though present, have an unclear origin and function.
- Marsupial enamel structure, particularly in Monodelphis domestica, requires further elucidation.
Purpose of the Study:
- To clarify the structure and function of enamel tubules in the marsupial opossum (Monodelphis domestica).
- To investigate the relationship between enamel tubules and odontoblastic processes.
Main Methods:
- Microscopic analysis of opossum enamel structure.
- In vivo tetracycline labeling to trace transport pathways.
- Strontium detection to identify mineral transport.
Main Results:
- Enamel prisms run obliquely from the dentinoenamel junction (DEJ) to the enamel surface.
- Enamel tubules are present within prisms and interprismatic enamel, originating from the DEJ.
- Odontoblastic processes penetrate the DEJ into enamel tubules, showing active transport of substances like tetracycline and strontium.
Conclusions:
- Enamel tubules are formed in relation to ameloblasts and are continuous with dentinal tubules.
- Odontoblastic processes actively transport substances through enamel tubules, indicating a functional role in enamel formation and maintenance.