Cementoblastoma
It is a rare tumour arising from the cells of the cementum. It usually occurs before the age of 25 years with no gender predilection. The lower jaw has more tendencies to develop it and it is mainly seen in the anterior region of the jaw. It is intimately associated with the tooth which is generally vital. The tumour can cause expansion of the cortical plates of the lower jaw and occasionally have low grade pain.
Radiographic features:
The tumour appears to replace the root and is radiopaque. However the border appears radiolucent representing the periodontal ligament space and the advancing front of the tumour.
Treatment:
Because of the intimate association of the tumour with the root of the tooth, it cannot be removed without sacrificing the tooth. The bone surrounding it should be trimmed to enable the removal of the tumour. The recurrence is not seen.