“…The main characteristics of the included studies are described in Table 1 according to guidance approach, system, number of examinations, ZI characteristics, and conclusions. A total of 14 studies [ 8 , 10 , 11 , 12 , 13 , 14 , 15 , 19 , 32 , 33 , 34 , 35 , 36 , 37 ], including one RCT [ 32 ], two retrospective studies [ 15 , 19 ], five prospective studies [ 12 , 13 , 33 , 34 , 37 ], six cadaver studies with one comparative analysis [ 8 , 10 , 11 , 14 , 35 , 36 ], were retrieved from the search. Those reported ZI planned/placed accuracy in 144 patients (77 male and 67 female) and 35 cadavers with total of 511 ZIs (Nobel Biocare: 274, Southern Implant: 42, SIN Implant: 16, non-mentioned: 179); six studies used 35 cadavers with 118 ZIs.…”