Study Follow-up
(years) 		Study design Population Patients
(n) 		Age
(years) 		Gender
(male/female)
Total SIG LIG Mean SIG LIG
Bernardi et al. [28] 1 Randomized split mouth trial Patients Presenting a posterior bilateral edentulous mandible, with bone height quantity less than 9 mm 36 18 18 62 NR NR
Felice et al. [29] 5 Prospective RCT Partially edentulous patient having bilateral edentulism in posterior jaws 40 NR NR Mandible 54.1;
maxilla 57.6 		NR NR
Felice et al. [30] 5 Prospective RCT Partially edentulous patients having 7 to 8 mm of residual crestal height and at least 5.5 mm thickness 60 30 30 55.5 7/23 15/15
Bechara et al. [31] 3 Prospective RCT Patients with partial edentulism in the posterior atrophic maxilla at least 4 months after extraction with residual bone height ≥ 4 mm and width ≥ 5 mm under the maxillary sinus 53 33 20 48.1 (SD 15.1) 10/23 9/11
Nielsen et al. [32] 1 Prospective RCT Patients with partial edentulism in the posterior part of the maxilla 37 20 17 52 9/11 6/11
Guljé et al. [33] 10 Prospective RCT Patients, missing a premolar or a molar in the posterior maxilla and residual bone height underneath the maxillary sinus between 6 to 8 mm 38 20 18 49 7/13 11/7
Thoma et al. [34] 10 Prospective RCT Patients with partial edentulism in the posterior maxilla 101 50 51 50.5 21/29 28/23
Shah et al. [35] 1 Prospective RCT Patients had to have one or more missing teeth Residual ridge vertical bone height at the implant site had to be 6 to 8.5 mm 50 25 25 58.4 (SD 11.6) 9/16 10/15
Bolle et al. [36] 1 Prospective RCT Partially edentulous patient who was missing teeth in the premolar and/or molar area 80 40 40 59.93 17/23 21/19

SIG = short implants group; LIG = longer implants group; RCT = randomized control trial; n = number; NR = not reported; SD = standard deviation.