Thecodont dentition

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] This morphology was once used as a basis for the now-defunct taxonomic group Thecodontia.

References

"Palaeos Vertebrates > Bones > Teeth: Tooth Implantation".
Bertin, Thomas J. C.; Thivichon-Prince, Béatrice; LeBlanc, Aaron R. H.; Caldwell, Michael W.; Viriot, Laurent (2018). "Current Perspectives on Tooth Implantation, Attachment, and Replacement in Amniota". Front. Physiol. doi:10.3389/fphys.2018.01630.

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[1] "Palaeos Vertebrates > Bones > Teeth: Tooth Implantation".

[2] Bertin, Thomas J. C.; Thivichon-Prince, Béatrice; LeBlanc, Aaron R. H.; Caldwell, Michael W.; Viriot, Laurent (2018). "Current Perspectives on Tooth Implantation, Attachment, and Replacement in Amniota". Front. Physiol. doi:10.3389/fphys.2018.01630.