Shovel-shaped incisors or, more simply, shovel incisors are incisors whose lingual surfaces are scooped as a consequence of lingual marginal ridges, crown curvature or basal tubercles , either alone or in combination. In some instances, incisors can present a more pronounced version of this called double shovel-shaped. When present, shovel-shaped incisors can indicate correlation among populations and are considered to be one of the non-metrical traits in osteology. Structurally resembling the shovel-shaped incisors, double-shovel-shaped incisors are distinguished by a more pronounced mesial ridge comparing to the distal ridge. Similarly, the grades for both shovel-shaped incisors and the double shovel-shaped incisors in females are significantly greater than that in males.
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A Common Variation in EDAR Is a Genetic Determinant of Shovel-Shaped Incisors
It apparently has conferred some advantage to its carriers, because it is found in the majority of Asian people today. Or maybe those women survived when women with more body fat yes, boobs are fat, sorry guys and who could sweat less perished. Want to know if you carry this trait? Generally, a spreadsheet or Notepad will be your preferred methods.
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Finding good photos is really difficult. Fletcher was kind enough to share with us a photo of his own shovel shaped teeth. I have shovel shaped teeth too, all 4 of my top middle teeth. In addition, they have a bony shaped ridge near the gumline that is very pronounced and extends down over part of the shovel shape, to about one fourth of the tooth. Pingback: in review Native Heritage Project.
Shovel shape of upper incisors is a common characteristic in Asian and Native American populations but is rare or absent in African and European populations. Like other common dental traits, genetic polymorphisms involved in the tooth shoveling have not yet been clarified. In ectodysplasin A receptor EDAR , where dysfunctional mutations cause hypohidrotic ectodermal dysplasia, there is a nonsynonymous-derived variant, C rs , that has a geographic distribution similar to that of the tooth shoveling. This allele has been recently reported to be associated with Asian-specific hair thickness. For this purpose, we measured crown diameters and tooth-shoveling grades and analyzed the correlations between the dental traits and EDAR genotypes in two Japanese populations, inhabitants around Tokyo and in Sakishima Islands.