Palatal arch expander assembly and method of adjusting

摘要

A palatal arch expander assembly provides low, constant expansion forces to the palatal arch and provides individual corrective forces to either the first or second molars. A shape memory or superelastic archwire can be cooled below its transition temperature so that it is easily bendable for insertion into the mouth. After insertion, the archwire warms to a temperature above its transition temperature and provides low, continual expansion forces throughout the treatment period without requiring further adjustment. A pair of adjustment wires are bendable and provide individual corrective forces to either the first or second molars. The adjustment wires can be readjusted at any point during the treatment period. The archwire can be formed from a nickel-titanium alloy wire or superelastic material and the adjustment wires can be formed from nicoloy, stainless steel, or similar metal wire.