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The species was thought to have lived 6.1 to 5.7 million years ago. Fossil remains have provided very important information regarding dental morphology. Orrorin had smaller teeth relative to body size and the enamel was thicker. [5] The upper canines contain a mesial groove which differs from both Australopithecus and Ardipithecus. [5]
The enamel on primary teeth has a more opaque crystalline form and thus appears whiter than on permanent teeth. The large amount of mineral in enamel accounts not only for its strength but also for its brittleness. [6] Tooth enamel ranks 5 on Mohs hardness scale (between steel and titanium) and has a Young's modulus of 83 GPa. [4]
There is archeological evidence that humans have attempted to replace missing teeth with root form implants for thousands of years. Remains from ancient China (dating 4000 years ago) have carved bamboo pegs, tapped into the bone, to replace lost teeth, and 2000-year-old remains from ancient Egypt have similarly shaped pegs made of precious metals.
Using radiocarbon dating, the researchers determined that the remains were about 900 years old. Genetic sequencing of tooth samples laid bare that “Well-man” had a medium skin tone, blue eyes ...
Paranthropus seems to have had notably high rates of pitting enamel hypoplasia (PEH), where tooth enamel formation is spotty instead of mostly uniform. In P. robustus , about 47% of baby teeth and 14% of adult teeth were affected, in comparison to about 6.7% and 4.3%, respectively, in any other tested hominin species.
Metabolic disorders resulting from poor diet or disease have a particularly significant effect on enamel, and a range of other non-specific diseases can cause the feature, such as measles, diphtheria and deficiency in vitamin A, D and C. [24] The identification of enamel hypoplasias is best done with microscopic analysis of tooth thin sections ...
The labyrinthodonts flourished for more than 200 million years. Particularly the early forms exhibited a lot of variation, yet there are still a few basic anatomical traits that make their fossils very distinct and easily recognizable in the field: Strongly folded tooth surface, involving infolding of the dentin and enamel of the teeth.
Image credits: Velghast Out of the many interesting responses in this thread, one particularly caught our eye. Redditor u/Velghast shared his unusual ability to smell insects, which intrigued us ...
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