Different appliances can be used during the early mixed dentition to expand the constricted maxillary arch. Among the most commonly used and easily fabricated applainces are Quad helix appliance and W-arch expander.
The Quad-helix incorporates 4 helices to increase the wire length thus increasing the flexibility and range of action while W-arch appliance simply has wire in the shape of W to expande arch. This appliance has wide range of action can be used for anterior as well as posterior arch expansion. The appliance consists of 0.036 stainless steel wire and two molar bands on first molar.
Management of constricted arch is one of the common problem for dentists and these appliances are very useful not only in the aspect of its effectiveness but also the cheap price, easy activation and fabrication.
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