RESUMO
The aim of this case report was to introduce an appliance that can be used for Whip device; correcting severe rotation of anterior teeth in pre-adolescent children. Severe rotation; This is a case report of an 11-year-old Iranian boy with a mixed Mesiodens dentition Class I malocclusion defined by a severe rotation of upper left central incisor and a mesi-odens between the centrals. The supernumerary tooth was first extracted, and then a Whip device including removable appliance, a cantilever spring and bonded tube on rotated tooth was inserted into his mouth. After 8 months, the upper left central incisor was orthodontically brought into proper alignment. Circumferential supracrestal fibrotomy was done next to overcorrection of the tooth and one week after surgery, the device was removed and the retention was started. The whip device, a removable appliance can be very effective for correcting severe rotation of anterior teeth