The Non-Helix Appliance: An Alternative to the Quad Helix
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 ...
Orthodontic Expander or Spacer - Quad Helix Appliance - YouTube