A histological and ultrastructural study of the tidemark in human condylar cartilage / 中华口腔医学杂志
Chinese Journal of Stomatology
; (12): 425-427, 2002.
Article
em Zh
| WPRIM
| ID: wpr-347336
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WPRO
ABSTRACT
<p><b>OBJECTIVE</b>To study the histology and ultrastructure of the tidemark in the adult condylar cartilage and their significance.</p><p><b>METHODS</b>After embedded in paraffin, 50 adult condyles were stained with HE, partly with Van-Gieson and histochemical methods, then observed by light microscope. 3 cases of the tidemark region were observed by transmission electron microscope, another 5 cases were studied by scanning electron microscope.</p><p><b>RESULTS</b>In the tidemark region, there had shown the presence of the AKP and calcium, absence of the proteoglycan, abundance of the membrane-bound matrix vesicles, crystals of hydroxyapatite and lipid nodule-like substances, which were often observed in the load-bearing areas. The collagen fibrils of the noncalcified cartilage crossed the tidemark gradiently and were continuous with those of the calcified cartilage; a band of horizontal fibrils surrounded the whole tidemark region, which was wider in the load-bearing areas than that in the nonload-bearing areas and which interweaved with the gradient fibrils so as to form a net. Digested with papain, the surface of the tidemark was highly undulating, and a lot of chondrocyte lacunae were seen on the surface, which were surrounded by calcified tissues.</p><p><b>CONCLUSIONS</b>In the region of the tidemark, physiological calcification takes place and is more active in the load-bearing areas; gradient and horizontal fibrils interweave with each other, which is correlated with the force on the articulation.</p>
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Assunto principal:
Articulação Temporomandibular
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Microscopia Eletrônica
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Microscopia Eletrônica de Varredura
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Biologia Celular
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Histocitoquímica
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Côndilo Mandibular
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Métodos
Limite:
Adult
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Female
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Humans
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Male
Idioma:
Zh
Revista:
Chinese Journal of Stomatology
Ano de publicação:
2002
Tipo de documento:
Article