Table 1.

Main data of the included studies

Authors, year	Patients			Diagnostic criteria for diagnosis of peri-implantitis
	Ethnicity	Case	Control
Shimpuku et al. 2003	Japan	17	22	ABL > 0.5 mm
Laine et al. 2006	Belgium	71	44	ABL (3 threads), BOP, pus
Cury et al. 2007	Brazil	17	19	ABL (3 threads), BOP, pus
Lachmann et al. 2007	Germany	11	18	PPD > 4 mm
Lin et al. 2007	Japan	29	30	ABL > 0,5 mm
Hamdy et al. 2007	Egipt	25	25	PPD > 4 mm, ABL, BOP
Gurol et al. 2011	Turkey	32	46	ABL > 3 mm, PPD > 5 mm, BOP, pus
Melo et al. 2012	Italy	16	31	PPD > 4 mm, BOP, pus
Ladeira-Casado et al. 2013	Brazil	31	40	ABL > 3 mm, pus
García-Delaney et al. 2015	Spain	27	27	ABL > 2 mm, PD > 4 mm, BOP, pus
Rakic et al. 2015	Germany	189	180	ABL (> 2 threads), PPD > 5 mm, BOP
Petkovic-Curcin et al. 2017	Serbia	34	34	ABL (> 2 threads), PPD > 4 mm, BOP

Case: patients with peri-implantitis. Control: patients without peri-implantitis. ABL: alveolar bone loss; BOP: bleeding on probing; PPD: peri-implant pocket depth