Aim and background : This case report reveals successful autotransplantation case using computer aided rapid prototyping (CARP) models with immature third Case description : The compromised right lower second molar was transplanted with third molarusing CARP model. Postoperatively, the pulp vitality and the development of the roots were examined clinically and radiographically. The patient follow up period was 1 year after surgery. Follow up showed that transpl anted t oo th was asymptomatic and functional. Radiographic examination indicated that the ap ex developed continuously and the root length and thickness increased. The final follow up examination revealed that the transplant kept the vitality, with normal pe riodontal ligaments space and trabecular bony patterns. This case report highlights autotransplantation of immature t oo th using CARP models resulted in favorable prognosis. Conclusion: The CARP model enables a more predictable prognosis for autotransplantation. Based on long-term follow-up observations, when extra efforts are made for proper case selection and PDL cell survival, as in this case, improved clinical results such as vertical bone growth, can be expected