Study Year of publication Type of study Reason of exclusion
Ferreira et al. [4] 2006 Cross sectional Not prospective
Roccuzzo et al. [5] 2010 Prospective Did not report information on peri-implantitis
Kostantinidis et al. [6] 2015 Cross sectional Not prospective
Sbordone et al. [17] 1999 Prospective No control group
Mengel et al. [18] 2001 Prospective No control group
Mengel et al. [19] 2005 Prospective Did not report information on peri-implantitis
Mengel et al. [20] 2007 Prospective Did not report information on peri-implantitis
Fardal and Linden [21] 2007 Prospective No control group
De Boever et al. [22] 2009 Prospective Peri-implantitis criteria not clearly defined
Koldsland et al. [23] 2009 Cross sectional Not prospective
Levin et al. [24] 2011 Prospective Did not report information on peri-implantitis
Horwitz and Machtei [25] 2012 Prospective No control group
Pjetursson et al. [26] 2012 Prospective No control group
Casado et al. [27] 2013 Retrospective Not prospective
Jiang et al. [28] 2013 Prospective Did not report information on peri-implantitis
Marrone et al. [29] 2013 Cross sectional Not prospective
Roccuzzo et al. [30] 2014 Prospective Peri-implantitis criteria not clearly defined