Abstract
Background: dentigerous cysts are commonly seen in association with third molars and maxillary canines. Only 5–6% of dentigerous cysts are associated with supernumerary teeth. We report a rare case of dentigerous cyst associated with an impacted anterior maxillary supernumerary tooth (mesiodens)
 CASE presentation: A 30 -year-old male reported to our Department of Oral Medicine, School of Dentistry at Hamedan University of Medical Sciences , with chief complaint of a painless swelling in the anterior upper jaw(in the region of incisors) for a duration of 3 month . At the time of his presenting, His medical history was unremarkable, with no systemic problems and no report of pain.
 Conclusion: Although the association of dentigerous cyst with an impacted supernumerary tooth(mesiodens) is rare, prevention of harmful complications as developmental cyst, early diagnosis and treatment is necessary.the standard treatment is Enucleation
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