The Schwarz appliance is utilized to achieve transverse expansion. A single expansion screw is used to achieve expansion although in some cases an additional screw may be required as per the image. Schwartz appliances are primarily used on the upper arch and are removable.

Dr. William Clark, an Orthodontist, developed an uncomplicated technique that incorporates the use of upper and lower bite blocks to reposition the mandible forward for skeletal Class II correction. The Twin Block technique is easy to use and very patient friendly. The design utilizes two separate appliances that fit the maxilla and mandible. The unique design allows for more patient comfort and increased patient cooperation. The Twin Block design also allows for independent development of the upper and lower arches with the addition of transverse and/or sagittal screws.

A removable appliance to break the habit of thumb sucking or tongue pushing