Study Year of
publication
Follow-up
period
Study
design
Patients
number
Implants
number
PI P value GI P value PD P value BoP/mBI P value
KM ≥ 2 mm KM < 2 mm KM ≥ 2 mm KM < 2 mm KM ≥ 2 mm KM < 2 mm KM ≥ 2 mm KM < 2
mm
Mean (SD) Mean (SD) Mean (SD) Mean (SD)
Boynuegri et al. [21] 2012 1 year Prospective
clinical study
15 36 0.05 (0.19) 0.28 (0.38) < 0.05 0.07 (0.26) 0.58 (0.6) < 0.05 0,24 (0,3) 0,39 (0,36) > 0.05
Chung et al. [22] 2006 > 3 years Prospective
clinical study
69 339 1.26 (0.05) 1.51 (0.09) < 0.05 0.76 (0.04) 0.94 (0.07) < 0.05 2.9 (0.05) 2.85 (0.06) > 0.05 0.54 (0.09) 0.43 (0.08) > 0.05
Adibrad et al. [23] 2009 2 years Prospective
clinical study
27 66 1.2 (0.71) 1.87 (0.59) 0.02 1.01 (0.67) 1.65 (0.78) 0.01 2.98 (0.51) 3.11 (0.56) 0.115 0.38 (0.34) 0.49 (0.3) 0.04
Bouri et al. [24] 2008 1 year Prospective
clinical study
76 200 1.25 (0.53) 1.78 (0.78) < 0.001 0.91 (0.72) 1.5 (0.77) < 0.001 3.72 (0.75) 3.87 (0.66) 0.132
Romanos et al. [25] 2015 > 2.6 years Retrospective
study
118 320 0.45 (0.56) 0.69 (0.63) 0.001 0.11 (0.31) 0.31 (0.52) < 0.0001
Souza et al. [26] 2015 1 year Present
cohort study
80 270 0.6 (0.51) 0.92 (0.52) 0.008 2.36 (0.41 2.43 (0.65) 0.582 51 (27.2)% 63.8 (29.3)% 0.033
Kim et al. [31] 2009 13 months Prospective
clinical study
100 276 0.74 (0.83) 0.74 (0.91) 0.943 0.38 (0.66) 0.44 (0.72) 0.472 2.84 (1.8) 2.62 (1.55) 0.328
Esper et al. [32] 2012 1 year Cross-sectional
study
109 202 0.6 (0.62) 0.67 (0.71) 0.487 1.25 (0.61) 1.11 (0.58) 0.127 3.02 (1.05) 2.43 (1.02) < 0.001

PI = plaque index; GI = gingival index; PD = pocket depth; BoP/mBI = bleeding on probing/modified bleeding index; SD = standard deviation.