Complete dentures can be either "conventional" or immediate. Made after the teeth have been removed and the gum tissue has begun to heal, a conventional denture is ready for placement in the mouth about 8-12 weeks after the teeth have been removed. Unlike conventional dentures, immediate dentures are made in advance and can be positioned as soon as the teeth are removed. As a result, the wearer does not have to be without teeth during the healing process. However, bones and gums shrink over time. Especially during the healing period following tooth removal. Therefore a disadvantage of immediate dentures compared with conventional dentures is that they require more adjustments to fit properly during the healing process and generally should be considered temporary until a permanent reline can be completed to custom fit the denture after the healing is complete.
Dr. James L. Johnson