The study consisted of 12 individuals, with 10 (83.3%) females and two (16.7%) males. The mean age of the sample was 55.83 ± 2.78 years.

A total of 12 maxillary atrophic patients were rehabilitated, 10 using the transmaxillary implants. Of these, two patients rehabilitated with the transmaxillary implant required postoperative adjustments because the implants were lost. In the first case, it was necessary to remove the right-side implant due to infection during grafting. On the left side, the transmaxillary implant was kept in a horizontal position, and on the right side, the conventional implant was placed. In the second case, due to the indication of a graft, which would be performed on the same day of the implant placement, the patient opted for a conventional implant.

None of the patients registered with biological complications, such as perforation of the sinus membrane, mucositis, and peri-implantitis. All patients presented recovery of soft tissues, without infection of the maxillary sinus, paresthesia, fistula or abscess, or mechanical or prosthetic complications, such as a fracture of the implant or any prosthetic component.

It was possible to observe an improvement in the perception of OHRQoL between the pre- and postoperative periods in the OHIP-14 total score and the domains related to functional limitation (D1), physical pain (D2), psychological discomfort (D3), psychological disability (D5), social disability (D6), and handicap (D7) (p < 0.05; Table 1).