Fused primary incisors in siblings: Case report and literature review

Abstract

Fusion may be defined as a union of two separately developing tooth germs typically leading to one less tooth than normal in the affected arch. This phenomenon has been described by several different terms, such as gemination, double teeth and twinning. Factors which have been implicated as possible etiologies for fused teeth include hypervitaminosis, pressure from physical contact of young tooth buds, and genetic factors. This article reports two cases of unilateral fused primary maxillary incisors in siblings, with a discussion covering further elaboration of definitions of gemination and fusion, clinical implementation and review of literature.