Aetiology Normal: in deciduous teeih before shedding. Pathological:

• idiopathic—internal or external

• secondary (local inflammation, pressure from malposed tooth or rumour, orthodontic movement, replantation, buried teeth).

Pathology Idiopathic: progressive resorption by giant cclls, mainly of dentine. There is sometimes intermittent reparative activity to form a complex pattern of resorption and bone-like reparative tissue. Resorption (internal or external) can expose pulp (Figs 25, 26 & 27). Pulpitis follows.

Secondary: usually localized giant cell activity. Variable reparative activity with hard tissue deposition is seen.

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