Supernumerary Tooth

A supernumerary tooth is an abnormally developed extra tooth. It is mostly related to heredity. It can appear at any region of the dental arch, but most commonly erupts in between the upper front teeth, or is completely embedded inside the jaw.
Photograph of a supernumerary tooth erupting in between the upper cental incisors.

Oral problems associated with supernumerary teeth:

If the above situations happen, the supernumerary tooth needs to be extracted. If the supernumerary tooth cannot erupt, surgical extraction of the supernumerary tooth is required.

Leong's Premolar

A Leong's premolar differs from an ordinary premolar by having some tooth structures projecting from its occlusal surface. The structures is very fragile and is liable to fracture. If it is not properly treated after fracture, the pulp may undergo necrosis due to an infection and may lead to dental abscess formation.
Photograph of a Leong’s premolar. Animation showing the process of pulp  infection caused by the fractured projected tooth structures of a Leong’s premolar.

In order to prevent this from happening, preventive treatment is advocated. The dentist will, according to the tooth condition, either reinforce the fragile structures or remove the structures and restore the defect.

Fused teeth

When two teeth are united during the developmental stage by the union of their tooth germs, a fused tooth will be formed. There will be a groove on the surface of the tooth, and it is commonly found on deciduous front teeth.When there is a deciduous fused tooth, a succeeding permanent tooth may be missing.

Photograph showing a deciduous lateral incisor united with a canine to form a fused tooth. Photograph of a missing permanent lateral incisor in the lower set of teeth.

Last revision date: 18 January 2012