Background: Immature permanent teeth with pulpal necrosis and open apices are difficult to manage because of incomplete root development and the absence of an apical constriction. Case Presentation: A 29-year-old male with a history of trauma 20 years earlier presented with discolored, fractured maxillary central incisors. Clinical and radiographic findings confirmed pulpal necrosis with chronic apical abscess and open apices. Treatment comprised chemomechanical preparation, calcium hydroxide intracanal medication, MTA apexification, thermoplasticized gutta-percha obturation, internal bleaching, and porcelain laminate veneer rehabilitation. Conclusion: A multidisciplinary approach successfully restored periapical health, function, and esthetics with satisfactory one-year follow-up.