Study	Reason for exclusion
Altug‐Atac 2008	Interventions did not include a type of surgical anchorage
Baxmann 2010	Randomisation does not occur between 2 types of anchorage reinforcement
Bondemark 2005	Interventions did not include a type of surgical anchorage
Chen 2008	This study is not a randomised controlled trial as confirmed after translation of this article
Cheng 2004	Randomisation does not occur between 2 different types of anchorage reinforcement
Deguchi 2008	This study is not a randomised controlled trial
Garfinkle 2008	This is a split‐mouth study
Gelgor 2007	This study is not a randomised controlled trial, as confirmed by author correspondence
Gollner 2009	This study is not a randomised trial
Kadioglu 2008	This study is not a randomised controlled trial
Lee 2011	This study is not a randomised controlled trial, as confirmed by author correspondence
Melsen 2007	Interventions do not include a type of surgical anchorage
Moon 2008	There was only a single intervention
Motoyoshi 2007	This study is not a randomised controlled trial
Palagi 2010	Interventions did not include a type of surgical anchorage
Papadopoulos 2010	Interventions do not include a type of surgical anchorage
Polat‐Ozsoy 2011	Interventions do not include a type of surgical anchorage
Schatzle 2009	This study did not include patients undergoing orthodontic treatment with fixed appliances
Thiruvenkatachari 2008	This study is not a randomised controlled trial
Upadhyay 2008‐2	This study is not a randomised controlled trial, as confirmed by author correspondence
Upadhyay 2012	This study is not a randomised controlled trial, as confirmed by author correspondence
Wiechmann 2007	This study is not a randomised controlled trial
Wilmes 2009	This study is not a randomised controlled trial
Zhou 2009	This study is a prospective controlled trial. However, there is no indication that randomisation was carried out. Correspondence address for the authors could not be found to confirm