What classification best fits a properly designed mandibular implant overdenture with 2 ball attachments?

The classification that best fits a properly designed mandibular implant overdenture with 2 ball attachments is RP-5. This classification is used for removable prostheses that are supported by implants, specifically when they involve both the support of soft tissue and retention provided by the implants.

In this case, the mandibular implant overdenture is designed to leverage the support of the underlying bone structure while utilizing ball attachments to provide stability and retention. This setup enhances the retention of the overdenture and improves the overall function, which is characteristic of an RP-5 classification.

The other classifications do not specifically define this type of implant-supported scenario. For instance, FP-1 and FP-2 typically refer to fixed complete or partial dentures, which would not apply to an overdenture situation. RP-4, while also relating to removable prostheses, does not specifically denote the attachment type used. Thus, the RP-5 classification appropriately describes the supported overdenture with the ball attachment mechanism.