![Figure 2 from Treatment effects of a modified quad-helix in patients with dentoskeletal open bites. | Semantic Scholar Figure 2 from Treatment effects of a modified quad-helix in patients with dentoskeletal open bites. | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/fa51a7e4b096f53059adb184745da839b4d0a3f2/2-Figure2-1.png)
Figure 2 from Treatment effects of a modified quad-helix in patients with dentoskeletal open bites. | Semantic Scholar
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...
![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)