Journal of AdvancedMedical and Dental Sciences Research

Maxillary quad-helix appliance is a usually used method for treatment of maxillary arch constriction and/or posterior crossbite. The quad-helix expansion was accomplished with a prefabricated .036'' quad-helix soldered to bands on the maxillary molars. Along with the utility arch and sectional mechanics, the quad helix appliance has become an integral part of the bioprogressive technique. This review article discusses about clinical course and effects of maxillary expansion using the quad-helix appliance.