Corticotomy-assisted orthodontic treatment is an option to accelerate orthodontic tooth movement. It
also can reduce risks of root resorption, dehiscences and fenestration; increase stability after orthodontic treatment;
and expand envelope of tooth movement. In bimaxillary protrusion patients, corticotomy-assisted en-masse retraction
can improve malocclusions and prevent side effects from anterior tooth movement beyond the anatomical limit.
After a corticotomy, the decreased bone density effects the center of resistance of anterior teeth. The mechanics
for en-masse retraction and force systems should be considered for desired anterior teeth movement and control
of the posterior segment.