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A diphyodont is any animal with two successive sets of teeth, initially the "deciduous" set and consecutively the "permanent" set.〔Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey (2013) (Milk teeth and the replacement of teeth ). The Animal Diversity Web.〕〔(Early mammal teeth - pag 13 )〕 Most mammals are diphyodonts as to chew their food they need a strong, durable and complete set of teeth. Diphyodonts contrast with polyphyodonts, whose teeth are constantly replaced. Diphyodonts also differ from monophyodonts which are animals who have only one set of teeth that do not change over a long period of growth. In diphyodonts the number of teeth that are replaced varies from species to species. In humans a set of twenty deciduous teeth, or "milk teeth", are replaced by a completely new set of thirty-two adult teeth. In some cases hypodontia or hyperdontia occurs, the latter in cleidocranial dysostosis and gardner's syndrome. In the hare the anterior incisors are not replaced but the posterior smaller incisors are replaced. Manatees, kangaroos and elephants vary from most other mammals because they are polyphyodont. Not much is known about the developmental mechanisms regulating diphyodont replacement. The house shrew, ''Suncus murinus'', and the Chinese miniature pig〔(Otevřít soubor. - Masarykova univerzita )〕 are currently being used to study the diphyodont replacement of the deciduous dentition by replacements and additional permanent teeth. ==See also== * Heterodont * Polyphyodont * Schultz's rule 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Diphyodont」の詳細全文を読む スポンサード リンク
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