Focal hypercementosis affecting a mandibular molar: a case report.

Hypercementosis is an abnormal thickening of the cementum. Although the etiology of this condition is uncertain, it occasionally is related to disorders of bone metabolism, including Paget disease and hyperthyroidism. The case presented here illustrates localized idiopathic deposition of excess cementum at the apex of the distal root of a mandibular first molar.