The cusps contain both dentine and enamel, whereas minor projections on the crown, called crenullations, are the result of different enamel thickness.
32.
Similarly, its elasmoid scales lack superficial odontodes composed of dentine and enamel; this loss appears to be a synapomorphy with more crownward tetrapodomorphs.
33.
The " tetracycline teeth " have brown or grey colour as a result of a defective development of both the dentine and the enamel of teeth.
34.
The dermal bones of arandaspids consist of aspidine ( acellular bone ) and are ornamented with oakleaf-shaped tubercles which seem to contain no dentine.
35.
Their dorsal and ventral shield is made up by numerous polygonal platelets of aspidine, ornamented with large dentine tubercles capped with a thick enameloid layer.
36.
The scales comprise a non-growing " crown " composed of dentine, with a sometimes-ornamented enameloid upper surface and an aspidine base.
37.
These lines are formed in Enamel and dentine at the point of birth . Therefore, only teeth that are developing at birth can exhibit neonatal lines.
38.
Dentine contains many thousands of microscopic tubular structures that radiate outwards from the pulp; these dentinal tubules are typically 0.5 2 micrometres in diameter.
39.
Tooth demineralization is a chemical process by which minerals ( mainly calcium ) are removed from any of the hard tissues enamel, dentine, and cementum.
40.
In addition, three dentine lakes are visible in the occlusal surface, which has dimensions of 4.58 ?at least 2.52 mm.
