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.
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.
A Leong's premolar differs from an ordinary premolar by having some tooth structure projecting from its occlusal surface. The structure 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.
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.