Hypercementosis is the excessive deposition of cementum on the root surface of a tooth, resulting in an abnormal increase in root volume and a characteristically club-shaped or bulbous root form visible on radiographs. While not a disease in itself, it represents a response to various local and systemic stimuli and is most often discovered incidentally during routine dental imaging.

Common Causes

Hypercementosis can arise from a range of local irritants or systemic conditions. Identifying the underlying cause guides appropriate patient management.

• Periapical inflammation: Chronic irritation from pulpal or periapical disease is among the most frequent local triggers, stimulating cementoblast activity around the root apex.
• Occlusal trauma: Excessive or abnormal bite forces can drive cementum-producing cells to deposit additional layers on the root surface.
• Paget’s disease of bone: This systemic skeletal condition often produces generalized hypercementosis affecting multiple teeth simultaneously.
• Supraeruption: Teeth that have lost their opposing partners may continue to erupt over time, stimulating excess cementum formation.
• Idiopathic: In some cases, no identifiable local or systemic cause can be determined.

Clinical Significance

Hypercementosis is almost always asymptomatic and does not directly damage the tooth or its supporting structures under normal circumstances. On a periapical radiograph, the affected root appears enlarged, with the cementum layer visibly thickened beyond normal contours. Critically, the periodontal ligament space typically remains intact and uniform around the expanded root surface, which helps distinguish hypercementosis from ankylosis, root resorption, or other root pathologies that may appear similar at first glance.

The most clinically significant consequence arises during tooth extraction. A bulbous or irregularly shaped root dramatically increases the risk of root fracture or fracture of the surrounding alveolar bone during removal. Surgical extraction — including tooth sectioning or targeted bone removal — is frequently required, and careful review of pre-operative radiographs is essential for anticipating and safely managing this complication.

Hypercementosis itself requires no direct treatment, but addressing the underlying cause, whether resolving periapical infection or managing a systemic condition, remains the appropriate clinical priority, and thorough radiographic assessment before any planned extraction is the most important safeguard against procedural complications.