Abstract:
Crossbite is defined as a malocclusion resulting from the lingual positioning of the maxillary teeth in relationship to the mandibular teeth.This may involve just a single tooth or could include all four upper incisors.
Dental crossbite has a reported incidence of 4- 5% and usually becomes evident during the early mixed dentition phase. The factors which causes dental crossbite include a palatal eruption path of the maxillary anterior incisors; trauma to the primary incisor resulting in lingual displacement of the permanent tooth germ; crowding in the incisor region; inadequate arch length. So, various treatment methods have been proposed to correct anterior and posterior dental crossbite. The quad helix is mostly used to unlock malocclusions and to establish normal function and arch form by expanding the dental arches. Early treatment with the quad-helix appliance proved to be highly effective in increasing intermolar, palatal, and alveolar widths. The teeth moved through the alveolus, leading to substantial decreases in buccal bone thickness and increases in lingual bone thickness.
Keywords:
Crossbite, Quad helix, Slow expansion.