Case Reports in Dentistry / 2017 / Article / Fig 6

Case Report

Asymmetric Expansion with a Modified Quad Helix for Treatment of Isolated Crossbite

Figure 6

Asymmetric Quad Helix: extraoral (a) and intraoral (b) views. When the auxiliary wire segment is applied into the mouth, it must not interfere either with the mucosa or with the band in order to not give rise to undesired positions or stress.