Clinical and patient-reported outcome of implant restorations with internal conical connection in daily dental practices: prospective observational multicenter trial with up to 7-year follow-up

Table 3 Mean crestal bone level changes in mm

Bone level change	n	Mean	SD
Insertion-loading	103	− 0.52	0.55
Loading-1-year follow-up	93	− 0.04	0.37
Loading-3-year follow-up	90	− 0.04	0.40
Loading-5-year follow-up	86	− 0.09	0.43

For some patients no radiographs were available at the follow-up visits for various reasons (e.g., patient refusal for X-rays or not available from referring dentists)
Negative value indicates bone loss