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Histology of Enamel 

Professor Dr Maha Mounir 

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Enamel is Unique

• Unique matrix proteins

• Unique crystalline structure

• Epithelial in origin• Hydroxyapatite

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Enamel Rod • Longitudinal section

 

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Wavy course of enamel rod • Enamel rods follows

a wavy course the

full thickness of 

enamel• A more spiral course

is noted at cusps &incisal areas Gnarled enamel

 

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Characteristics• Chemical characteristics

• Physical characteristics

• Structural features

• Enamel Rod: Basic Structural Unit

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E rod • Cross section of enamel

rod

 

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Microscopic 

 picture of Enamel 

• Brown striae of 

Retzius

 

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DEJ, E tufts, E spindles

 

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Structures related to appositional 

growth of enamel 

 

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Enamel lamellae & Cracks

 

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Perikymata (imbrication lines)• Are external manifestations

of Retzius striae

 

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Thank you