RESUMO
The oropharyngeal cavity of Hoplias malabaricus, an ichthyophagous freshwater fish, is anatomically adapted to predation. Macroscopic and microscopic analyses were conducted in order to study the morphology and system of implantation and replacement of teeth. The results showed that this teleost has conical and caniniform teeth, with an orthodentin crown covered by an enameloid cap and a vascularised orthodentin in the root. With regard to the implantation system, there is a junction between the tooth and the bone tissue, as a typical physiological dental ankylosis. The teeth are replaced by a resorption process of multinucleated giant cells that actively eliminate the dentin and bone tissue.
A cavidade orofaríngea do Hoplias malabaricus, um peixe de água doce ictiófago, é anatomicamente adaptado à predação. Análises macroscópica e microscópica foram realizadas com o objetivo de estudar a morfologia e o sistema de implantação e substituição dentária. Os resultados mostraram que este teleósteo apresenta dentes cônicos e caniniformes, com coroa de ortodentina coberta por capuz enamelóide e ortodentina vascularizada na raiz. Em relação ao Sistema de implantação, existe uma junção entre o dente e o tecido ósseo, semelhante a uma anquilose dentária fisiológica típica. Os dentes são substituídos por um processo de reabsorção por células gigantes multinucleadas que ativamente eliminam a dentina e o tecido ósseo.
Assuntos
Animais , Caraciformes/anatomia & histologia , Caraciformes/fisiologia , Implantação Dentária/veterinária , OrofaringeRESUMO
The oropharyngeal cavity of Hoplias malabaricus, an ichthyophagous freshwater fish, is anatomically adapted to predation. Macroscopic and microscopic analyses were conducted in order to study the morphology and system of implantation and replacement of teeth. The results showed that this teleost has conical and caniniform teeth, with an orthodentin crown covered by an enameloid cap and a vascularised orthodentin in the root. With regard to the implantation system, there is a junction between the tooth and the bone tissue, as a typical physiological dental ankylosis. The teeth are replaced by a resorption process of multinucleated giant cells that actively eliminate the dentin and bone tissue.
