[EP-20] Some explanations of the comparative evolution of the skull, upper and lower jaws of ancient and modern people based on Darwin's theory of evolution, and putting forward classical behavioral methods for the correct development of the upper and lower jaws in children.
[Abstract]
[Objective]
We studied the number of teeth on the upper and lower jaws of human ancestors and ancient people (Bronze, Hunnu, ancient Mongolian and modern/current Mongolian) in comparison with phylogenetic and ontogenetic stages of their development to determine changing directions and patterns.
[Methods]
Studies of the skull, jaws and dentition carried out on archaeological finds belonging to the Bronze, Hunnu and Ancient Mongol periods, using clinical, radiographic, and antropometric methods.1-2
[Result and Discussion]
During the human phylogeny and ontogeny the phenomenon of “reduction of teeth”, as well as the tendency of narrowing the alveolar and basal arches on the upper and lower jaws were observed, still continuing nowadays in the form of wrong and incomplete eruption of teeth. We predict a further decrease in the number of teeth from 38 to 24 through millions of years of human evolution from apes to modern intelligent humans. It was revealed that the upper and lower dental arches, alveolar and basal arches decreased by 0.9 - 1.5 cm, which made it impossible for wisdom teeth to erupt.
[References]
1) Dahlberg AA. The changing dentition of man. JAMA. 1945;676-90 2) Bailey SE. A closer look at Neanderthal postcanine dental morphology: the mandibular dentition. Anat Rec 2002;148-56.
[Objective]
We studied the number of teeth on the upper and lower jaws of human ancestors and ancient people (Bronze, Hunnu, ancient Mongolian and modern/current Mongolian) in comparison with phylogenetic and ontogenetic stages of their development to determine changing directions and patterns.
[Methods]
Studies of the skull, jaws and dentition carried out on archaeological finds belonging to the Bronze, Hunnu and Ancient Mongol periods, using clinical, radiographic, and antropometric methods.1-2
[Result and Discussion]
During the human phylogeny and ontogeny the phenomenon of “reduction of teeth”, as well as the tendency of narrowing the alveolar and basal arches on the upper and lower jaws were observed, still continuing nowadays in the form of wrong and incomplete eruption of teeth. We predict a further decrease in the number of teeth from 38 to 24 through millions of years of human evolution from apes to modern intelligent humans. It was revealed that the upper and lower dental arches, alveolar and basal arches decreased by 0.9 - 1.5 cm, which made it impossible for wisdom teeth to erupt.
[References]
1) Dahlberg AA. The changing dentition of man. JAMA. 1945;676-90 2) Bailey SE. A closer look at Neanderthal postcanine dental morphology: the mandibular dentition. Anat Rec 2002;148-56.