Extensive idiopathic external apical root resorption on a 13 year old child.

External root resorption in permanent teeth can occur as a result of a multitude of local and systemic factors. Root resorption that is idiopathic or occurring without any identifiable underlying cause is an unusual phenomenon, especially in children. This article describes a rare case of extensive external apical root resorption affecting multiple teeth and occurring concomitantly with localized periodontitis in a 13 year-old child. No significant systemic, local or familial findings could be identified as a plausible cause for the root resorption.