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Ultrastructure of the dental epithelium and odontoblasts during enameloid matrix deposition in cichlid teeth
Author(s) -
Prostak Kenneth,
Skobe Ziedonis
Publication year - 1986
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051870204
Subject(s) - odontoblast , ultrastructure , biology , microbiology and biotechnology , ameloblast , procollagen peptidase , matrix (chemical analysis) , anatomy , dentin , organelle , amelogenesis , epithelium , cichlid , enamel paint , chemistry , pathology , materials science , fish <actinopterygii> , medicine , genetics , chromatography , fishery , composite material
Teleost enameloid matrix has been proposed to be an ectodermal, mesodermal, or joint ectodermal‐mesodermal product. To determine its origin we examined the ultrastructure of the inner dental epithelium (IDE), odontoblasts, enameloid, and dentin matrices of cichlid tooth buds at the stage of enameloid formation. © Alan R. Liss, Inc. Columnar IDE cells had apical and basal terminal webs and contained organelles associated with protein synthesis, including elongated secretory granules containing fibrillar material having cross‐striations with 60‐nm periodicity. The morphology of IDE secretory granules was typical of procollagen granules observed in a large variety of ectodermal and mesodermal cells synthesizing collagen. In contrast, the paucity of secretory granules within three odontoblast types indicates that these cells probably do not synthesize enameloid matrix. These observations are consistent with the idea that the bulk of the enameloid matrix is itself an ectodermal collagen synthesized and secreted by IDE cells.