A) TBB group ( Hybrid Hyrax ). B) TB group ( Hyrax ). 
TB, maxillary deficiency, crossbite, occlusion of the palatal cusp of the maxillary, overcorrection
The same digital workflow was used to manufacture the Hyrax tooth-borne appliance
(TB group, All patients were treated by the same orthodontist, and the activation protocol
was the same in both groups: The expander screw was activated on the first day
with one full turn (four activations of ¼ turn), and in the following days, ¼
turn twice a day (every 12 h) until correction of the maxillary deficiency and
overcorrection of crossbite (occlusion of the palatal cusp of the maxillary
first permanent molars with the corresponding buccal cusp of the mandibular
first permanent molars). No analgesics were prescribed; however, the patients
were allowed to use them at their discretion. None of the patients reported
using analgesics.