Here, we report the complete resolution of a calcifying cystic odontogenic tumor (CCOT) in the right mandible after marsupialization in an 8-year-old girl with a mixed dentition. Clinical, radiographic, and histopathological findings showed a simple cystic variant of CCOT in the region of the deciduous second molar, with dislocation of the permanent second premolar tooth germ. Initial treatment involved marsupialization, including extraction of the involved deciduous tooth, incision of pathological tissue, and creation of a window in the extraction socket. The crown of the dislocated second premolar was exposed at the base of the cystic cavity after marsupialization. One year and ninemonths later, complete bone healing and spontaneous eruption of the second premolar were observed, providing evidence of the bone regeneration capacity and tooth germ eruption potential in children. No recurrence was observed after 7years. The findings from this case suggest that marsupialization can be successfully applied for the treatment of CCOT in children with a mixed dentition.
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