Supernumerary teeth may cause the delayed or impaired eruption of
succedaneous teeth (26-52%), displacement or rotation of permanent teeth (28-63%), crowding, abnormal diastema or premature space closure, dilaceration or abnormal root development of permanent teeth, cyst formation (4-9%), or eruption into nasal cavity(Mitchell L, 1989).
This reduction in arch length circumference may compromise the eruption of
succedaneous teeth. One approach is to control the space created from the premature loss of primary teeth by the provision of a space maintainer (SM) appliance [Qudeimat and Fayle, 1998; Christensen and Fields, 2005].