Number of Implants
The use of more implants decreases the number of pontics and the associated mechanics and strains on the prosthesis, and dissipates stresses more effectively to the bone structure (especially at the crest). It also increases the bone implant interface and improves the ability of the fixed restoration to withstand forces. The selection should be based on bone volume, bone density, occlusion and the opposing dentition, the available proprioception and the implant surface area and distribution. In case the implant number is less than the desired the occlusal overload and the stresses would lead to bone loss, mobility and subsequent loss of the implants.