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In the mid 20th century, shovel-shaped incisors were considered to be a trait useful for racial categorization, since the occurrence of shovel-shape incisors varies between many populations. [20] A 1964 text said that many anthropologists at the time used the trait of shovel-shaped incisors as a diagnostic for race.
The permanent teeth include supernumerary teeth. Unless these supernumeraries are removed they will crowd the adult teeth in what already may be an underdeveloped jaw. If so, the supernumeraries will probably need to be removed to make space for the adult teeth. Up to 13 supernumerary teeth have been observed. Teeth may also be displaced.
The appearance and perception of a tooth is the result of a complex interaction of factors such as lighting conditions, translucency, opacity, light scattering, gloss and the human eye and brain. [5] Of these, the intrinsic pigmentation of a tooth is the most influential, [4] which in turn is determined by genetic and natural factors. [6]
An epicanthic fold or epicanthus [6] is a skin fold of the upper eyelid that covers the inner corner (medial canthus) of the eye. [3] However, variation occurs in the nature of this feature and the presence of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature.
Turner's hypoplasia or Turner's tooth is a presentation of enamel hypoplasia that normally affects only a single tooth. Its causes can be the same as other forms of enamel hypoplasia, but it is most commonly associated with trauma to a primary maxillary central incisor and the subsequent developmental disturbance of the underlying permanent ...
There are small differences between the teeth of males and females, with male teeth along with the male jaw tending to be larger on average than female teeth and jaw. There are also differences in the internal dental tissue proportions, with male teeth consisting of proportionately more dentine while female teeth have proportionately more ...
Dental anomalies are among the most recognizable features of ED, with common findings including hypodontia (missing teeth), oligodontia (absence of six or more teeth), and anodontia (complete absence of teeth). Teeth that are present often exhibit unusual shapes, such as conical or peg-like forms, particularly in the anterior regions of the mouth.
Discoloured teeth - teeth may be amber, brown, blue or opalescent; Bulbous shape to the tooth crown due to cervical constriction; Tooth wear/Non-carious tooth surface loss (NCTSL) - due to the poorly mineralised dentine, the enamel of the tooth is unsupported and subsequently shears or chips off as it is subjected to biting forces. This exposes ...