Early intervention of cross bite during mixed dentition with quad helix appliance.

'Posterior crossbite' occurs when the maxillary posterior teeth bite lingual to mandibular posteriors by obstructing the growth of dento facial complex. Early orthodontic intervention helps in disability limitation and reestablishment of form and function by both banded and bonded appliances. Quad Helix indicated its use in bilateral as well unilateral cross-bites involving primary and transitional dentitions1. The Concern over excessive force generation during rapid maxillary expansion led to its development and use in growing children6. Correction of cross bite with quad helix appliance in two patients is presented here along with discussion.