The Nance appliance is designed to prevent arch length loss by maintaining the position of the maxillary molars. To accomplish this, it uses an acrylic button in the pre-maxillary region of the palate to add stability. This design is also frequently used during full banding and bracketing to create an anchorage unit. Note - This appliance must be monitored carefully as the acrylic pad can act as a food trap. Left unresolved, the pad could actually become embedded in the tissue. This can easily be controlled with the use of an oral irrigator.