Difference between revisions of "AY Honors/Oral Hygiene/Answer Key"
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Revision as of 02:07, 21 May 2021
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Oral hygiene is the practice of keeping the mouth and teeth clean to prevent dental problems, most commonly, dental cavities, gingivitis, periodontal (gum) diseases and bad breath.
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Dentition pertains to the development of teeth and their arrangement in the mouth. In particular, it is the characteristic arrangement, kind, and number of teeth in a given species at a given age.
Some species have teeth that are all of the same type, such as most non-mammalian vertebrates - homodont dentition. The dentition of animals in which the teeth are continuously discarded and replaced throughout life is termed polyphyodont. Species whose teeth differ morphologically are said to have heterodont dentition. The dentition of animals with only one set of teeth throughout life is monophyodont.
The dentition of animals (including humans) with two successions of teeth (deciduous, permanent) is referred to as diphyodont.
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A diphyodont is any animal with two successive sets of teeth, initially the "deciduous" set and consecutively the "permanent" set. Most mammals are diphyodonts as to chew their food they need a strong, durable and complete set of teeth. In diphyodonts the number of teeth that are replaced varies from species to species but in humans a set of twenty deciduous teeth are replaced by a completely new set of thirty-two adult teeth.
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