Modern humans have surprisingly powerful bites, a new study has revealed.
Humans are often considered wimps compared with our strong-jawed relatives, but now scientists find that our bites might be far mightier than before thought. Relative to our size, humans could chomp down with as much force as a chimpanzee or even the so-called huge-jawed extinct "nutcracker man."
One of the key traits that mark the beginning of the human lineage, other than upright postures and larger brains, are smaller teeth. Still, oddly, we possess very thick tooth enamel, a feature typically linked with strong bites.
Now researchers find that although modern humans possess smaller teeth and jaws than our closest relatives, both living and extinct, we have surprisingly powerful bites.
Although the human skull is relatively lightly built, Australian scientists found that our jaws are at least 40 percent more efficient than those of the chimp, gorilla and orangutan, and of two prehistoric members of our family, Australopithecus africanus and Paranthropus boisei — the latter nicknamed "the nutcracker man" for its especially massive skull and jaw muscles.
"For our size, we humans are comparable in terms of maximum bite force to these fossil species," said researcher Stephen Wroe, a biomechanist and paleontologist at the University of New South Wales in Sydney, Australia. "Size matters, but efficiency matters more, and humans are very efficient biters."
The scientists developed sophisticated 3-dimensional computer models from actual skulls they CAT-scanned, including one from an African bushman hunter-gatherer that might better reflect what ancient humans might have been like than a living person. These simulations provided highly detailed views of where stresses occur in materials in scenarios designed to mimic real life, a technique Wroe and his colleagues have previously used to study the jaws of a number of living and extinct species, such as the great white shark.