• Benign odontogenic tumor of cementoblasts.
  • Closely related to benign osteoblastoma, osteoid osteoma.
  • Large majority in late teens, early 20s.
  • 75% in mandible; 90% in molar/premolar.
  • Most common location: mandibular first molar.
  • Pain and swelling in many cases.
  • Radiographic features:
    • Calcified mass attached to tooth root, obliterates outline of root.
    • Radiopacity often lobular or radiating.
    • Peripheral radiolucency.