“…Among the included studies, six studies illustrated negative outcomes in regard to endodontic regeneration therapy in the management of immature necrotic permanent teeth [ 29 , 34 , 46 , 48 , 49 , 54 ]. On the other hand, 40 studies showed significant positive outcomes for endodontic regeneration treatment in these kinds of teeth due to root development, root wall thickening, root lengthening, and formation of hard tissue barrier or apical closure [ 3 , 4 , 6 , 16 , 20 , 22 , 26 – 28 , 30 – 33 , 35 – 45 , 47 , 50 – 53 , 55 – 65 ]. The outcomes of these 46 studies include different types of intracanal medications, scaffolds, pulpal space/barrier, root maturation stage, follow-up duration, and updating studies on their effect in periapical periodontitis and periapical healing.…”