Quad Helix Expander | In Phase I (for our younger patients), we often use a quad helix expander to gently expand the upper arch. It is an orthodontic appliance that is...
![Quadhelix appliance. (A) 2 months after insertion. (B) 9 months after... | Download Scientific Diagram Quadhelix appliance. (A) 2 months after insertion. (B) 9 months after... | Download Scientific Diagram](https://www.researchgate.net/publication/319427659/figure/fig3/AS:614015214563341@1523404043608/Quadhelix-appliance-A-2-months-after-insertion-B-9-months-after-insertion.png)
Quadhelix appliance. (A) 2 months after insertion. (B) 9 months after... | Download Scientific Diagram
![Quad-helix compression to decompensate molar inclination prior to skeletal expansion | Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie Quad-helix compression to decompensate molar inclination prior to skeletal expansion | Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie](https://media.springernature.com/m685/springer-static/image/art%3A10.1007%2Fs00056-019-00212-7/MediaObjects/56_2019_212_Fig2_HTML.png)