A prosthesis that derives its support and sometimes retention from one or more abutment(natural teeth present in mouth) teeth which may have been reduced in height.
The retention of roots of natural teeth provides improved stability to a denture as well as maintaining alveolar bone. Roots should be used as overdenture abutments when the standard of oral hygiene is high and there is good periodontal support.
The alveolar bone is retained around these teeth. By keeping the teeth, the proprioceptive fibres of the periodontal membrane help in maintaining sensory feedback and allow more rapid adaptation to the dentures.