Objectives: A variation on the usual maxillary sinus grafting technique and its results are presented, using a more conservative approach that provides better conditions for applying the graft in complicated situations. Material and Methods: Ten case reports are presented in which the multiple access technique was used due to the existence of large maxillary sinuses, where a wide surgical approach was needed because several implants were to be installed or cases in which sinus bone graft was part of a more extensive reconstructive prodedure. Results: All the implants that were placed after using this technique were correctly integrated and it was possible to proceed to the prosthesis stage without any problems. Conclusions: This modified technique of sinus floor bone grafting can have a beneficial effect with a lower risk of perforations, better preservation of vascularisation in the area and improved integration and stability of the implants and bone graft, specially where wider surgical access is required