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Perikyma

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as a series of linear grooves. In anatomically modern humans, each perikyma takes approximately 6–12 days to form. Thus, the count of perikymata may be used to assess how long a tooth crown took to form. They may disappear as the enamel wears over time after the tooth erupts.
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at the surface of enamel. They can be found on all teeth, but are usually the easiest to notice on anterior teeth (incisors and canines).
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Perikymata

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"Perikyma"
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Greek
tooth enamel
striae of Retzius
ISBN
1107078261
Category
Parts of tooth

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