An unusual case of furcation external resorption.

AIM: To describe the presentation and management of an unusual external root resorption.

SUMMARY: An unusual external inflammatory root resorption presented in the furcation of a mandibular first molar. Review of earlier radiographs suggested that the lesion was non-progressive. Occlusal trauma associated with anterior open bite was the most likely aetiological factor. No active treatment was prescribed.

KEY LEARNING POINTS: External resorption may occur following loss of the external root surface. Occlusal trauma may be a propagating stimulus for progressive resorption. Lesions may sometimes be non-progressive, and treatment may therefore be more damaging than observation.