Figure 2.

Orthodontic Appliance for Maxillary Expansion. Palatal expansion appliance used for slow expansion of the maxillary bones, bonded on the posterior teeth. b Orthodontic Appliance for Functional Rehabilitation. U-Bow activator Type 1, as described by Karwetzky, used to achieve midline coordination and retain palatal expansion (a - outer view, b – inner view).

Lippold et al. BMC Musculoskeletal Disorders 2012 13:151   doi:10.1186/1471-2474-13-151
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