Study Study type Follow-up
(period or mean) 		Sample size Number of implants Early complications Late complications
Maxilla Mandible Patients
(%) 		Implants
(%) 		Years after
restauration 		Patients
(%) 		Implants
(%)
Kuchler et al. [14] Prospective 9 weeks 24 0 48 0 0 0 0 0
Mozzati et al. [15] Retrospective 2 - 9 years 235 660 607 Unknown Unknown 5 6.8 1.3
Holahan et al. [16] Retrospective 6,1 years 645 (all)
208 (with BMD-T scores within 3 years) 		2867 (all)
701 (with BMD-T scores within 3 years) 		Unknown Unknown 1 Bone quality:
good 2.7; moderate 4.6; poor 11.6.
3 Bone quality:
good 4.2; moderate 7.1; poor 16.6.
5 Bone quality:
good 5; moderate 7.5; poor 17.4.
10 Bone quality:
good 6.7; moderate 8.8; poor 17.4.
Shibli et al. [17] Retrospective 4 years 21 22 (non-distinguished) - - - - -

BMD-T = Bone mineral density test.