Quad Helix is orthodontic appliance used in maxillary expansion technique.
Sakamoto T, Sakamoto S, Harazaki M, Isshiki Y, Yamaguchi H.
Orthodontic treatment for jaw deformities in cleft lip and palate patients with the combined use of an external-expansion arch and a facial mask. (Bull Tokyo Dent Coll. 2002 Nov;43(4):223-9.)
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Petren S, Bondemark L, Soderfeldt B.
A systematic review concerning early orthodontic treatment of unilateral posterior crossbite. (Angle Orthod. 2003 Oct;73(5):588-96.)
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