Abstract: Objective: To evaluate the efficacy of the decompression associated with reformed space maintainer for the large dentigerous cysts in children. Methods: 11 patients with large dentigerous cysts were underwent decompression operations. Cystic fluid was evacuated continuously. The cyst cavity was kept open and packed with iodoform gauze. The patients wear the reformed space maintainer after 1 week. Patients were followed-up for 6-24 months. Results: 11 cases of cysts were disappear and the bone defect ossified. 1 of 11 patients needed additional orthodontic treatment. Embedded permanent teeth of all patients erupted into dental arch or evidently moved upward. No patients were reported the sign of persistence or the recurrence of cyst. Conclusion: The decompression associated with reformed space maintainer is a safe, reliable, effective method in treating large dentigerous cyst in children. This not only can satisfactory restore esthetics and function, but also prevents the children from psychosocial trauma.

Key words: Large dentigerous cyst, Decompression, Space maintainer