Table 1.

Results of the search

	References
Included articles
	Ekstrand et al., 2010 [13] Martignon et al., 2012 [14] Paris et al., 2010 [15]a Meyer-Lueckel et al., 2012 [16]a
Excluded articles
Off the topic	Yazıcıoğlu and Ulukapı, 2014 [17] Vailati et al., 2013 [18] Salomon et al., 2012 [19] Krzemiński et al., 2011 [20] Liu et al., 2011 [21]
RI and aesthetics	Knösel et al., 2013 [22]
RI and shear bond strength of metal orthodontic brackets	Hammad and Enan, 2013 [23]
RI ex vivo study	Soviero et al., 2013 [24]
RI in situ study	Paris and Meyer-Lueckel, 2010 [25]
RI and the effect of two different acid etching agents	Paris et al., 2010 [26]

^aReferences 15 and 16 reported on the same study but for two different study periods, i.e. 18 and 36 months, respectively.