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To describe four cases of an uncommon type of segmental root development after endodontic revitalization procedures. The formation, development and prognosis of this phenomenon are discussed, along with the causes and preventive measures. This report describes one immature maxillary anterior tooth with an extensive periapical lesion after partial extrusion caused by trauma and three immature mandibular premolars with extensive periapical lesions after fracture of the dens evaginatus. All four teeth underwent revitalization procedures. Dur