Simple Hyrax (HSSI)
Not unlike the Hyrax and Haas appliances, the Simple Hyrax is a rapid palatal suture expander that requires just a single activation a day. Bonded on the first permanent molars only, this version can be worn on the longer term because it allows more space for the tongue.
Material required for manufacturing
– Upper stone model
– Rings may or may not be provided
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