Non-surgical prosthetic rehabilitation using a double-crown overdenture in a young adult with multiple ankylosed and impacted teeth: an 8-year follow-up case report

Background: Managing multiple ankylosed or impacted teeth in young patients is particularly challenging, as orthodontic or surgical options often fail or are contraindicated before skeletal maturity. When orthodontic and surgical interventions are no longer feasible, long-term prosthetic rehabilitation offers an effective and conservative solution for restoring function, esthetics, and psychological well-being during the transition to adulthood. Case: A 19-year-old male presented with multiple ankylosed and impacted teeth combined with oligodontia. Orthodontic traction and surgical exposure attempts had been unsuccessful due to extensive ankylosis. To restore oral function and esthetics without surgical intervention, a double-crown overdenture was fabricated during early adulthood. Zirconia and Polyetheretherketone(PEEK)-based materials were selected for the primary and secondary crowns to optimize retention, resilience, and esthetic integration. The prosthesis provided stable occlusion, functional improvement, and high patient satisfaction. During the 8-year follow-up, all abutment teeth remained functional with a 100% survival rate. Two episodes of primary crown recementation, one veneering repair, one denture base relining, and several minor sore spot adjustments were required, all of which were resolved chairside, allowing continuous and stable use of the prosthesis without major complications. Conclusion: This case highlights a minimally invasive, long-term successful rehabilitation in a young adult through a double-crown overdenture approach. With appropriate case selection and maintenance, such treatment can serve as a durable and esthetic solution extending from late adolescence into adulthood, offering both functional stability and psychosocial benefits when surgical or implant-based options are not feasible.