Animal studies	Arai 2020, Yadav 2015, Takano -Yamamoto 2017, Qamruddin 2015, Nishimura 2008, Alikhani 2018, Kalajzic 2014
Meta-analysis	Elmotaleb 2019
Systematic review	Vansant 2018, Jing 2017, Deery 2004, Aljabaa 2018, Alshahrani 2019, Gkantidis 2014, Rozen 2015, El-Angbawi A 2015, Lyu 2019
Review	Li 2018, Aldrees 2016, Andrade 2014, Uribe 2017, Miles P 2017, Krishnan 2017
In Vitro	Bozkurt 2019, Benjakul 2018, Seo Y 2015, Seo Y and Lims BS 2015, Bani-Hani 2018
No data on tooth movement	Alansari 2018, Shipley 2019, Jung 2017, Celebi 2019, Sakamoto 2019, Lau 2010, Judex 2018, Hansen 1999, Phusuntornsakul 2018, Raghav 2015
Article in language other than English	Krishtab 1986
Mini review	Brignardello-Peterson 2018
Case report	Orton-Gibbs 2015
Retrospective studies	Bowman 2014