title: The removable quadhelix appliance.
abstract: The introduction of a preformed removable quadhelix appliance with curved rotation sheaths for insertion and removal has overcome many of the clinical problems associated with the fixed quadhelix appliance. The design, fitting and activation of the appliance are described. Various applications and modifications are discussed.
mesh_terms: D004867:Equipment Design; D006801:Humans; D008963:Molar; D009968:Orthodontic Appliances, Removable; D010155:Palatal Expansion Technique / Q000295:instrumentation; D014087:Tooth Movement Techniques / Q000295:instrumentation