This video describes a simple method to identify and adjust areas where an implant overdenture might be binding on an abutment and preventing full seating of the denture.
All you need is a surveyor, an abutment analogue and a flat sided laboratory bur. For details see: Loney et al. Use of a dental surveyor to ensure optimal seating of implant overdenture attachments. Journal of Prosthetic Dentistry 2019;121:381-3.