Fixed maxillary and mandibular expanders include a broad range of appliance designs. The designs are used to correct cross-bites, narrow arches and crowding. The fixed expanders utilize some mechanism of force (expansion screws, self-activating spring or wire activation) for development of the arch. These fixed designs require minimal patient compliance and provide the doctor with total control during active orthodontic treatment. Auxiliary attachments such as brackets and habit breakers can be requested for most of the expander appliances.

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