As featured in the Journal of Clinical Orthodontics, December 1999, Dr. Ravi Nanda: CTA, Connecticut Intrusion Arch, is an intrusion archwire that opens the bite by intruding the anterior teeth opposing the extrusion of the posterior teeth. It is indicated for patients with balanced skeletal and soft tissue components, and for adult patients with periodontal considerations that can except 4mm of intrusion with no root resorption.
TIPS FOR CTA’ S BEST USE.
Put the CTA into an auxiliary tube of a triple buccal tube. Cut CTA excessive part and bend it behind. CTA’s force will activate the anterior segment intrusion. CTA is used in conjuction to a rectangular sectional archwire which is tied to the archwire in the traditional way. The sectional arch has a distal cut at 6° and a mesial cut at 4°.