Upper Transverse Appliance

Transverse Appliance

The transverse appliance is used to widen the upper and lower arch to correct bilateral cross bites and anterior crowding. It is recommended to have maximum clasping because of the forces generated from the screw. As with any expansion appliance, we recommend maximum retention with Adams clasps on the 6’s (if erupted) and ball clasps between the pre-molars. You can also incorporate a labial bow to control the anterior incisors and a posterior bite plate to disarticulate the arches providing additional anchorage for the upper appliance.


Treatment & Care

Activation of the screw is 1-2 times per week.

Patients should wear 22 hours a day and clean daily with toothpaste to prevent the buildup of plaque and odor. Avoid Efferdent and other effervescent solutions, as it may erode components on the appliance. It is recommended to use products like DentaSoak
or Retainer Splash.


  • Wire: American Orthodontics Chromium Cobalt
  • Acrylic: JBC Monomer and Polymer
  • Screw: Leone POP Expansion Screw