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The presence of shovel-shaped incisors, among many dental characteristics, is used in forensic dentistry to identify an individual's ancestry, [21] since this trait occurs predominantly in Asian and Native American populations.
If your teeth are shovel shaped, meaning the backs of your upper 4 teeth are shaped like a spoon as opposed to straight, then you have this trait. So are you wondering what this might have to do with genetic genealogy? Well, if you carry this gene, then you obtained it from some Asian ancestor.
Sinodonty is a particular pattern of teeth characterized by the following features: The upper first incisors and upper second incisors are shovel-shaped , and they are "not aligned with the other teeth".
For example, people of African descent tend to have wider teeth and flatter incisors, while people of Asian descent often have shovel-shaped incisors. Additionally, people of European descent tend to have smaller teeth and more pronounced canines.
As mentioned in the article, “Thick Hair, Small Boobs, Shovel Shaped Teeth and More,” this mutation for shovel shaped teeth is an Asian mutation that happened about 35,000 years ago. The good news is that because it’s fairly pronounced, it’s easy to determine if you have it or not, and is a good indicator of Native heritage.
Today, nearly 40 percent of Asian people share this dental trait. The genetic mutation behind tooth shoveling—found in two alleles of the EDAR gene—occurred in China some 30,000 years ago and...
A meta-analysis that combined analyses of Korean and Japanese subjects revealed that the Asian-specific 370A allele is associated with an increase in the grades of shoveling and double...
Morphological variations in human teeth have long been recognized and, in particular, the spatial and temporal distribution of two patterns of dental features in Asia, i.e., Sinodonty and...
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.
Researchers have uncovered the genetic sources of dental traits commonly found in East Asians, including upper central incisor shoveling, enamel extensions of the first maxillary molar, and 4-cusped second mandibular molars.