Abstract
Enamel microstructure of permanent and deciduous teeth of notoungulate Toxodon: development, functional and evolutionary implications
Highlights
Microstructural features vary in each tooth category, on the buccal and lingual sides, as well as in the different regions of each tooth
Hunter-Schreger bands (HSB) thickness ranges from 6 to 20 prisms, with the thickest portions placed in areas with intense masticatory loads
Deciduous premolars exhibit enamel in the early stages of development, and a neonatal line is observed almost parallel to the enamel-dentine junction (EDJ), possibly related to biological stress during birth
Summary
Analyses of ground sections of upper and lower incisors, premolars, molars, and deciduous premolars by scanning electron microscopy reveal Schmelzmuster with three enamel types: modified radial enamel (MRE), associated with the enamel-dentine junction (EDJ); Hunter-Schreger bands (HSB), an intermediary layer with decussating prisms; and radial enamel (RE), a layer placed next to the outer enamel surface. Microstructural features vary in each tooth category, on the buccal and lingual sides, as well as in the different regions of each tooth. The proportion of RE increases in the occlusal area of I2, which commonly exhibits intense wear, and may be related to abrasion resistance.
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