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- W2026097773 abstract "Frequencies and morphological and chronological distributions of enamel hypoplasias are presented by tooth type (permanent I1 to M2s), based on a sample of 30 prehistoric Amerindians with complete and unworn dentitions. There is nearly a tenfold variation in frequency of defects by tooth, ranging from 0.13 per mandibular second molar to 1.27 per maxillary central incisor. The six anterior teeth average between 0.70 and 1.27 defects/tooth, whereas the eight posterior teeth average between 0.43 and 0.13 defects/tooth. Earlier developing teeth, such as incisors, have earlier peak frequencies of defects (2.0–2.5 years), while later developing teeth, such as second molars, have subsequent peak frequencies (5.0–6.0 years). These variations are relevant when comparing hypoplasia data based on different teeth. Differences in hypoplasia frequencies among teeth are not solely due to variation in time of crown development, as is usually reported. Rather, there is evidence for biological gradients in susceptibility to ameloblastic disruption. Anterior teeth are more hypoplastic than posterior teeth. More developmentally stable “polar” teeth are more hypoplastic than surrounding teeth. Polar teeth may be more susceptible to hypoplasias because their developmental timing is less easily disrupted. In all teeth, hypoplasias are most common in the middle and cervical thirds. Crown development and morphological factors, such as enamel prism length anddirection, may influence the development and expression of enamel surface defects." @default.
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- W2026097773 date "1985-12-01" @default.
- W2026097773 modified "2023-10-16" @default.
- W2026097773 title "Factors affecting the distribution of enamel hypoplasias within the human permanent dentition" @default.
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- W2026097773 doi "https://doi.org/10.1002/ajpa.1330680404" @default.
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