Duck-billed dinosaurs had an amazing capacity to chew tough and abrasive plants with grinding teeth more complex than those of horses, cows and other well-known modern grazers, researchers have found.
A study by paleontologists and engineers, published in the journal Science, is the first to recover material properties from fossilized teeth.
Duck-bill dinosaurs, also known as hadrosaurids, were the dominant plant-eaters in what is now Europe, North America, and Asia during the Late Cretaceous about 85 million years ago.
With broad jaws bearing as many as 1400 teeth, hadrosaurids were previously thought to have chewing surfaces similar to other reptiles, which have teeth comprised of just two tissues — enamel, a hard hypermineralized material, and orthodentine, a soft bone-like tissue.
But paleontologists who study the fossilized teeth of these animals in detail suspected that they were not that simple.
“We thought for a long time that there was more going on because you could just look at the surface of the tooth and see advanced topography, which suggests that there are many different tissues present,” said Mark Norell, chairman of the American Museum of Natural History’s Division of Paleontology and an author on the paper.
To investigate the dinosaurs’ dental structure and properties in depth, Norell worked with lead author Gregory Erickson, a biology professor at Florida State University, and a team of engineers on a series of novel experiments.
Erickson sectioned the fossilized teeth and made microscope slides from them.
These revealed that hadrosaurids actually had six different types of dental tissues — four more than reptiles and two more than expert mammal grinders such as horses, cows, and elephants.
Using a technique called nanoindentation, in which a diamond-tipped probe is indented and/or drawn across the fossilized teeth to mimic the grinding of abrasive food, the researchers determined the differential hardness and wear rates of the dental tissues.
Erickson, who describes hadrosaurid dinosaurs as “walking pulp mills”, said: “We were stunned to find that the mechanical properties of the teeth were preserved after 70 million years of fossilization.
“If you put these teeth back into a living dinosaur they would function perfectly.”
In addition to the four dental tissues found in mammals — enamel, orthodentine, secondary dentine that helps prevent cavities, and coronal cementum that supports the teeth’s crests —the hadrosaurid teeth include giant tubules and a thick mantle dentine.
These extra tissues are thought to provide additional prevention against abscesses.
Also unlike mammalian teeth, the dental tissue distribution in hadrosaurids greatly varied in each tooth.
Together, these characteristics suggest that hadrosaurids evolved the most known in vertebrate animals, which might have led to their extensive diversification.
“Duck-bills’ advanced tissue modification appears to have allowed them to radiate into specialized ecological niches where they ate extremely tough plants like fern, horsetail, and ground cover that were not as easy for dinosaurs with shearing teeth to eat,” Norell said.
“Their complex dentition could have played a major role in keeping them on the planet for nearly 35 million years.”
In addition, the findings provide strong evidence that dental wear properties are preserved in fossil teeth — an idea that was once questioned and overruled in this study with comparative tests on teeth from modern and fossilized horses and bison.
This opens the door for studies on the dental biomechanics of fossils from wide-ranging groups of animals to better understand evolutionary modifications in diets.
This research was supported by the National Science Foundation.
Other authors include Brandon Krick, Matthew Hamilton, and Gregory Sawyer, of the University of Florida; Gerald Bourne, of the Colorado School of Mines; and Erica Lilleodden, of the Institute of Materials Research, Materials Mechanics, in Helmholtz-Zentrum Geesthacht, Germany.
G.M. Erickson, B.A. Krick, M. Hamilton, G.R. Bourne, M.A. Norell, E. Lilleodden, W.G. Sawyer, ”Complex Dental Structure and Wear Biomechanics in Hadrosaurid Dinosaurs,” Science (2012).