Dentigerous cyst of mandibular second premolar in a five-year-old girl, related to a non-vital primary molar removed one year earlier: a case report.

A dentigerous cyst of the mandibular second premolar in a 5-year-old female was radiographically diagnosed. A non-vital primary predecessor molar had been removed a year earlier. At that time, the primary molar had been in the mouth for approximately two years. Although there was the possibility of the premolar being non-vital, as a consequence of the cystic cavity surrounding it, marsupialization treatment of the cyst was done, causing a rapid development of the premolar. Structural irregularities in the enamel and in the first radicular portion were visible, possibly caused by the very early beginning of the cyst formation.