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Cementoblastoma  

Cementoblastoma is a benign and rare odontogenic neoplasm of mesenchymal origin more frequently seen in patients below 25 years of age, and is more common in the mandible. The mandibular first permanent molar is the most frequently affected tooth. The lesion is slow-growing and may cause expansion of cortical plates of bone, but is usually asymptomatic. Radiographically, the lesion appears as a well-circumscribed dense radiopaque mass often surrounded by a thin, radiolucent line. The outline of the affected root is generally obliterated because of resorption of the root and fusion of the mass to the tooth. Excision of the tumour with the associated tooth is the recommended treatment.

Image	Caption
	Figure 1: Radiograph of cementoblastoma. The original contour of the radices are hardly recognizable anymore. Notice thin peripheral radiolucent zone.