Hyperdontia (Supernumerary Teeth): Causes, Types & Management

Hyperdontia = extra teeth beyond normal dentition (20 primary, 32 permanent). Prevalence: 0.1–3.8% permanent, 0.3–0.8% primary. Male > female.

Classification

• By shape: Conical (peg), tuberculate, supplemental (normal shape), odontome.
• By position: Mesiodens (midline maxilla, most common), paramolar, distomolar, parapremolar.
• Eruption status: Erupted, impacted, inverted.

Etiology

• Genetic (autosomal dominant with incomplete penetrance).
• Dental lamina hyperactivity.
• Syndromic associations: Cleidocranial dysplasia, Gardner syndrome, cleft lip/palate, Ehler-Danlos.

Complications

• Crowding, displacement, impaction of permanent teeth.
• Diastema (midline gap from mesiodens).
• Root resorption of adjacent teeth.
• Cyst formation (dentigerous).
• Delayed eruption.

Management

• Radiographic survey (panoramic + occlusal/cone beam).
• Early extraction if causing pathology or blocking eruption.
• Monitor if asymptomatic, well-positioned.
• Orthodontic alignment often needed after extraction.

Routine dental exams catch supernumeraries early.