Orthodontics - A MODIFIED QUAD HELIX APPLIANCE ------------------------------- www.orthotropics.co.uk ------------------------------- This is one of the earliest appliances introduced for posterior expansion, it is made of 0.036 Blue Elgiloy and ...
Quad-helix compression to decompensate molar inclination prior to skeletal expansion | Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie
Why do teeth straightening treatments need quad helix?