Fig. 1From: Evaluating the efficacy of endodontic microsurgery for teeth with an undeveloped root apex and periapical periodontitis after nonsurgical treatment failureChanges in the periapical tissue after endodontic microsurgery upon the failure of the apical barrier technique. (A) Preoperative radiograph, (B) postoperative radiograph, and (C) follow-up radiographs after 3 months, (D) 6 months, and (E) 1 yearBack to article page