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Table 5 List of excluded studies (with reason)

From: Pain level between clear aligners and fixed appliances: a systematic review

Reference Reason for exclusion
Abu Alhaija et al. (2015) No intervention group
Ashkenazi et al. (2014) No intervention group
Bergius et al. (2000) Literature review
Bretz et al. (2018) No intervention group
Caniklioglu et al. (2004) No intervention group
Djeu et al (2014) No pain evaluation
Fetouh (2008) No pain evaluation
Fleming et al. (2009) No intervention group
Kavaliauskiene et al. (2012) No intervention group
Ke et al. (2019) No pain evaluation
Kim (2013) No control group
Mai-Tam (2018) Literature review
Maldotti et al. (2013) No control group
Noll et al. (2017) Study not related with the SR objective
Pacheco-Pereira et al. (2015) Study not related with the SR objective
Phuong (2018) Study not related with the SR objective
Polat (2007) No intervention group
Rakhshan (2015) No intervention group
Salcedo-Bugarín (2018) No intervention group
Scheurer et al. (1996) No intervention group
Sergl et al. (1998) No intervention group
Zealaiy et al. (2018) No intervention group
  1. SR systematic review