Large mandibular odontogenic keratocyst treated by decompression and secondary enucleation: a case report.

Odontogenic keratocyst (OKC) is a common developmental odontogenic cyst in clinic patients. Odontogenic cysts are often treated by enucleation, curettage, marsupialization and decompression. With apparent advantages, marsupialization and decompression are often the preferred option for adolescents with large jaw cysts. This article aimed to report a case of large OKC involving the left mandibular second molar and third molar in a 13-year-old adolescent. Decompression was performed to preserve the second molar and inferior alveolar nerve, and the third molar was extracted. After ten months of follow-up, cyst volume decreased significantly, and the impacted second molar erupted spontaneously through the bony window. Subsequently, the residual cyst was removed by enucleation. After 18 months, the second molar erupted to the occlusal plane and played a normal function. No evidence of recurrence was found during the entire follow-up period.