The Nance appliance is available with either straight or re-curved arms. It can either be removable or soldered to the bands. The Nance is effective in preventing mesial molar drift, and in the curved arm design, facilitates expansion or rotation of the molars.
The nance appliance is used to prevent the first molars from drifting in an anterior into spaces left by the primary molars. A wire is soldered to both maxillary first molar bands and extends towards the anterior to the deepest part of the palate where it is attached to an acrylic button. The acrylic button is placed against the palate preventing the forward drift of the molars.