Extra canal invasive resorption (ECIR) may occur as a complication following trauma particularly where it involves damage to cementum and supporting tissues. ECIR maybe evident clinically as a pink coronal discoloration (fig 1b),later with cavitation of the enamel (Fig 1a), often there are no obvious external signs (Fig 2b), and the condition is only detected radiographically (Figs 2a, 3a). It is characterized by the invasion of the cervical region of the root by fibro vascular tissue (fig 3b) which progressively resorbs dentine, enamel and cementum. The dental pulp remains vital by a layer of dentine and predentine until late in the process.
Teeth with ECIR have been divided into 4 classes (below) by Hithersay. He also identified that trauma is a potential factor. Other initiating factors are bleaching, orthodontics, and bleaching in combination with trauma. Treatment can be successful with class 1-3 by means of curettage, acid treatment, RCT and with a biocompatible restoration. Class 4 (fig. 4a&b) are non-treatable. Early diagnosis leads to a more successful outcome. If you have any questions regarding ECIR or any other clinical question please feel free to contact us at any time.
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