Implants in combination with an overdenture. Indications for the number of implants needed

: Considerations regarding the choice of the number of implants to be placed in combination with an implant-retained overdenture are discussed. Primarily, the characteristics of the chosen retention mechanism should be considered, as well as the magnitude and direction of forces on the implant-bone interface delivered through the suprastructure and implant, and the expected effects on the antagonist denture and/or jaw.