title: Mirror imaging of impacted and supernumerary teeth in dizygotic twins: A case report.
abstract: BACKGROUND
  Mesiodens is the most common type of supernumerary tooth found in the premaxilla. It might be discovered by the clinical examination by chance on a radiograph or as the cause of an unerupted maxillary central incisor. The genetic transmission of supernumerary and impacted teeth is poorly understood. Mirror imaging in twins has been reported frequently in relation to several unilateral dental anomalies including mesiodens. This phenomenon is the appearance of an asymmetrical feature or anomaly occurring on the right side of one twin but on the left side of the other twin. The event of mesiodens mirror imaging in monozygotic twins has been described in literature.
  
  
  RESULTS
  This is the first reported case of mesiodens mirror images in dizygotic twins. The de-scribed mesiodens caused the eruption failure of maxillary permanent incisors. The super-numerary teeth were removed to facilitate the spontaneous eruption of the impacted perma-nent maxillary incisors.
  
  
  CONCLUSIONS
  Studies related to supernumerary teeth can be useful to clinicians in the early diagnosis of this anomaly. Clinical and radiographic examinations provide a correct therapeutic approach. Key words:Supernumerary teeth, twins, dental development.
authors: Assistant Professor, Department of Oral and Maxillofacial Sciences, "Sapienza" University of Rome , Italy , School of Dentistry.
authors: Michele
authors: M
authors: Cassetta
authors: Research Assistant, Department of Oral and Maxillofacial Sciences, "Sapienza" University of Rome , Italy , School of Dentistry.
authors: Federica
authors: F
authors: Altieri
authors: Research Assistant, Department of Oral and Maxillofacial Sciences, "Sapienza" University of Rome , Italy , School of Dentistry.
authors: Alessandra
authors: A
authors: Giordano