Failed blade implant after 25 years in function: Case description and histologic analysis

This report describes a failed blade implant after 25 years in function in the left maxilla and the results of histologic analysis of peri-implant tissues. The blade was retrieved, and histologic findings revealed that it was not osseointegrated despite being successfully in function for so many years. The long-term function of blade implants without osseointegration can be attributed to biotolerance exhibited by the implant rather than actual osseointegration.