<prompt> Mushroom arch wire is used inBeggs applianceLingual applianceStraight wire applianceEdgewise appliance  <response>: Mushroom-shaped lingual arch formsNatural variations in faciallingual tooth dimensions are significant enough on the lingual aspects to require routine first-order bends. Distal to the cuspids, mesial to the molars and sometimes at the maxillary laterals.Fujita introduced the concept of mushroom-shaped archwire in conjunction with the lingual appliance. 