Maxillary Implant Overdenture Retained by Four Unsplinted Attachments and Opposed by a Natural or Fixed Dentition: Five-Year Clinical Outcomes. A prospective case series.

A substantial number of prosthetic complications and replacements occurred over the 5-year follow-up. After 5 years the OHIP-20 deteriorated and reached again the baseline level. Nonetheless, the VAS results suggest significantly increased patient satisfaction after implant-supported retention was provided for the removable prostheses.