Aetiology • Ageing.

• Chronic apical periodontitis (adjacent to resorption).

• Buried teeth, Pagct's disease.

Pathology Usually lamellar—sequential deposition of layers of cementum forming smooth thickcning of root. Rarely (Pagct's disease or ccmcntoblastoma), there is an irregular jigsaw-puzzle ('mosaic') pattern of intermittent deposition and resorption (Fig. 28).

Histopathology Hypercementosis
fig. 25 Internal resorption of dentine. fig. 26 External resorption.

fig 28 Hypercementosis: lamellar and irregular.

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