There are three kinds of dentures: conventional, immediate and overdentures. Conventional dentures are the removable dentures you probably think of.
These dentures are not placed in the mouth until several months after your teeth have been extracted, to allow the gums to heal. The advantage of conventional dentures is that they don’t usually have to be modified or refitted.
Immediate dentures, on the other hand, are inserted right after surgery. These dentures sometimes need to be adjusted or remade, as they may not fit as well once full healing has occurred.
An overdenture is used when some teeth remain; it fits over the remaining teeth.