“…ZI is considered as a successful alternative for rehabilitation of patients with severe maxillary atrophy; however, ZI insertion is a major surgery and can represent some risks (Aparicio, Manresa, Francisco, Ouazzani, et al, 2014;Brånemark et al, 2004;Candel-Marti, Carrillo-Garcia, Penarrocha-Oltra, & Penarrocha-Diago, 2012;Chrcanovic & Abreu, 2013;Chrcanovic, Albrektsson, & Wennerberg, 2016;D'Agostino et al, 2016;Grecchi et al, 2017;Goker et al, 2020;Yates et al, 2014). The possible complications of ZI surgery include sinusitis, soft tissue infections, paresthesia, and oroantral fistula, penetration of the orbital cavity during the drilling protocol, and failure of the implants (Filho, Amaral, Curra, dos Santos, & Cardoso, 2016;Maló, Nobre, Lopes, Ferro, & Moss, 2015;Nobre, Maló, & Gonçalves, 2015).…”