International journal of orthodontics 2014
Penta - V Helix: a modified Quad helix for correction of bilateral dentoalveolar cross bite.
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Standard Quad helix can be used to correct unilateral and bilateral dento alveolar posterior cross bite till first permanent molar. Correcting the second molar cross bite with quad helix is very difficult which requires fixed orthodontic attachment. To overcome this problem we have designed a Penta-V helix- a modified quad helix in correcting bilateral dentoalveolar posterior cross bite up to second molar.
