FAS Treatment Mechanics
Timing and sequencing of movements
FAS biomechanics have common aspects with straight-arch orthodontics but then again other characteristics that differentiate the planning from the classic technique.
One aspect that sets FAS apart is the possibility of taking advantage of different materials and their force levels for transversal corrections.

FAS uses a unique 3rd generation aligner material to obtain the best tracking.
FAS Soft Track is an optimized material with ideal elasticity for the best tracking. Additional attachments help to control dental corrections in the sagittal plane, crown inclination, rotations, extrusion and torque.
FAS Hard Track is a specific material for corticotomy-assisted arch expansion. The attachments are specific for torque control of posterior teeth while expanding the arch form.