Asymmetric Expansion Using Quad Helix For The Correction Of Unilateral Crossbite- A Case Report.

Maxillary transverse deficiency results in a posterior crossbite which can be orthodontically or orthopaedically corrected using expansion appliances. Expansion can be either produced symmetrically such that the arch expands uniformly, or asymmetrically, where one section of the arch expands more than the other.Unilateral crossbites that may or may not be isolated to a single tooth are more challenging to correct than bilateral crossbites. Quad helix is a slow maxillary expansion appliance that has been very effective over the years.This case report shows the use of a quad helix for asymmetric expansion to correct a unilateral crossbite.