Hyrax

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Maxillary Banded Hyrax

This is one of the most popular fixed arch expansion appliances for mixed and permanent dentition. Since it is fixed, cooperation is guaranteed.

The hyrax appliance consists of a midline hyrax screw, first molar bands, mesial rests on the first primary molars or first bicuspids usually. These mesial rests must be secured with flowable composite for added retention.

The hyrax is adjusted slowly, twice per week. After the desired amount of expansion has been achieved the appliance must be left in for an additional 6 months to avoid a relapse.

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