Different endodontic treatments induced root development of two nonvital immature teeth in the same patient: A case report

Table 1 Timeline of the treatment of the right maxillary second premolar

Timeline	Events
March 11, 2021	First treatment visit	Root canal irrigation and intracranial medication with calcium hydroxide paste
March 26, 2021	Second treatment visit	Penetration of the periapical tissue to induce bleeding, sealing of the coronal third of the root canal with iRoot BP plus
June 29, 2021	3-mo follow-up	Significant reduction of the periapical hypodense area and obvious closure of the apex
September 28, 2021	6-mo follow-up	Complete healing of the periapical lesion and slight increase in dentinal wall thickness
April 1, 2022	12-mo follow-up	Significant thickening of the dentinal wall and obvious narrowing of the root canal

Table 2 Timeline of the treatment of the right mandibular second premolar

Timeline	Events
July 19, 2021	First treatment visit	Root canal irrigation and intracranial medication with calcium hydroxide paste
July 30, 2021	Second treatment visit	Penetration of the periapical tissue without obvious bleeding
August 6, 2021	Third treatment visit	Penetration of the periapical tissue for a second time without obvious bleeding and performance of the apical barrier technique
August 13, 2021	Fourth treatment visit	Filling of the middle and coronal third of the root canal with hot gutta-percha and filling of the access cavity with light-cured composite resin
November 10, 2021	3-mo follow-up	Significant decrease in size of the periapical hypodense area
February 11, 2022	6-mo follow-up	Complete healing of the periapical hypodense area
August 25, 2022	12-mo follow-up	Narrowing of the periodontal ligament and complete closure of the apex