“…Two studies did not relate the number of drop-outs. 3,44 In 19 studies, 3,6,[24][25][26][27][30][31][32]34,[36][37][38][39][40]43,45,47,48 the implants were placed in healed sockets using the standard surgical protocol, in accordance with the principles described by Brånemark et al 49 In two studies, 28,29 immediate implants were placed with immediate prosthetic loading as well. In two studies, 44,46 the implants were placed in healed sockets, however there was early prosthetic loading.…”