Table 3.

Mean differential of peri-implant bone loss/gain (mesial and distal) between T0 (implant placement) and T2 (last recall). The minimum follow-up period was set at 1 year post-functional load

	∆Mesial mm	Dev st	∆Distal mm	Stan dev	Mean loading time (months)	Stan dev
Center 1	− 0.05	0.96	− 0.06	0.87	34.25	14.97
Center 2	0.18	0.91	0.15	1.12	33.03	19.31
Center 3	− 0.06	0.80	0.08	0.81	43.28	18.94
Center 4	0.32	1.61	0.49	1.80	35.97	19.84
Total	0.05	1.08	0.08	1.11	35.76	18.05