“…Alternative strategies to improve the RCR From the selected studies, 17 (22%) applied alternative strategies in an attempt to improve RCR. Thereby, blood venous derivatives, such as PRP (Jadhav et al 2012, 2013, 2014, Guven Polat et al 2014, Nagaveni et al 2015, Narang et al 2015, Wang et al 2015 and PRF (Torabinejad & Turman 2011, Rudagi & Rudagi 2012, Keswani & Pandey 2013, Mishra et al 2013, Jadhav et al 2015, Nagaveni et al 2015, Narang et al 2015, Ray et al 2015, Solomon et al 2015, Yadav et al 2015, were the most commonly applied. It was reported that PRP slightly improved the results of periapical healing, dentinal walls thickening, root lengthening (Jadhav et al 2013, Narang et al 2015 and apical closure (Jadhav et al 2013).…”