The Trans-Palatal Arch is comprised of stainless steel rings (bands) around the posterior teeth (usually molars) and a looped wire that spans the palate (roof of the mouth) without touching it.
A Lingual Holding Appliance is comprised of stainless steel rings (bands) around posterior teeth (usually molars) and a stainless steel wire that passively contacts the inside (lingual) surfaces of the teeth.
