Window decompression surgery for the treatment of large mandibular dentigerous cysts in the mixed dentition stage: a case report.

Dentigerous cyst is a common type of odontogenic jawbone cyst in clinical practice, often involving immature permanent tooth germ in children. Traditional cyst curettage may cause damage to the developing permanent tooth germ and surrounding important anatomical structures. This article reports a case of a large mandibular dentigerous cyst in a 9-year-old female child, which was treated with negative pressure drainage through window decompression surgery. During the operation, a lateral opening drainage tube was prepared and fixed with flowable resin. The cyst significantly shrank 6 months after surgery, and by 2 years and 10 months, the affected permanent teeth spontaneously erupted. This case demonstrates that window decompression combined with negative pressure drainage is an effective method for preserving the permanent teeth and jawbone tissue in the affected area to the greatest extent possible for large mandibular dentigerous cysts in the mixed dentition stage.