The Hyrax appliance from Ortholab.
The hyrax appliance is an all-metal expansion device which is laser-welded onto 4 bands.
By means of a special long key, the expansion screw can be unscrewed, so that a narrow upper jaw achieves the correct relationship with the lower jaw.
If you have any questions about Ortholab or one of its products, you can call us at +31 (0)343-415441 and ask for Ben Seijger or you can send an e-mail to info@ortholab.nl and we will answer your question as soon as possible.