Rehabilitation with implant prostheses in posterior areas requires the maximum number of implants possible due to the greater masticatory load of the region. However, the necessary minimum requirements are not always present in full. This project analyzed the minimum principal stresses (TMiP - representative of the compressive stress) to the friable structures, specifically the vestibular face of the cortical bone and the vestibular and internal/lingual face of the medullary bone. The experimental groups were as follows: the regular splinted group (GR), with a conventional infrastructure on 3 regular-length Morse taper implants (4x11 mm); and the regular pontic group (GP), with a pontic infrastructure on 2 regular-length Morse taper implants (4x11 mm). The results showed that the TMiP of the cortical and medullary bones were greater for the GP in regions surrounding the implants, especially in the cervical and apical areas of the same region, but they did not reach bone damage levels, at least under the loads applied in this study. It was concluded that the greater stress observed in the GP demonstrates greater fragility with this modality of rehabilitation, which should draw the professional's attention to possible biomechanical implications; whenever possible, professionals should give preference to the use of a greater number of implants in the rehabilitation system and should focus on preserving the supporting tissue with the generation of less intense stresses.

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