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Thecodont dentition is a morphological arrangement in which the base of the tooth is completely enclosed in a deep socket of bone, as seen in crocodilians, dinosaurs and mammals, and opposed to acrodont and pleurodont dentition seen in squamate reptiles. [1] Notably, this appears to be the ancestral tooth condition in Amniota. [2]
Thecodontia (meaning 'socket-teeth'), now considered an obsolete taxonomic grouping, was formerly used to describe a diverse "order" of early archosaurian reptiles that first appeared in the latest Permian period and flourished until the end of the Triassic period. All of them were built somewhat like crocodiles but with shorter skulls, more ...
An example of this are dinosaurs of the group Heterodontosauridae and the enigmatic early dinosaur, Eoraptor. While most dinosaurs had a single row of teeth on each side of their jaws, others had dental batteries where teeth in the cheek region were fused together to form compound teeth.
The third edition, published in 1980, was the first to recognize substance abuse (including drug abuse) and substance dependence as conditions separate from substance abuse alone, bringing in social and cultural factors. The definition of dependence emphasised tolerance to drugs, and withdrawal from them as key components to diagnosis, whereas ...
For example, members of the Synapsida generally possess incisors, canines ("dogteeth"), premolars, and molars. The presence of heterodont dentition is evidence of some degree of feeding and or hunting specialization in a species .
Still, the United Nations Office on Drugs and Crime stated that prescription drug abuse is a growing epidemic among recreational drug users in South Asia. [75] Although relevant studies in China were limited, they revealed a similar prevalence of prescription drug misuse among adolescents and young adults, which was 5.9 percent and 25.9 percent ...
New open-source forms of AI have sparked a disturbing trend of bad actors creating sexual images of children, or CSAM (child sex abuse material). AI is being used to create child sex abuse images ...
The disease model of addiction describes an addiction as a disease with genetic, biological, neurological or environmental origin. [1] The traditional medical model of disease requires only an abnormal condition causing distress, discomfort or dysfunction to an affected individual.