Abstract
Conceal is a brand name of lingual appliances developed in 1986 by 3M Unitek based on the theory and disign originated by Dr. Creekmore. One of the major features of this appliances is that it has .016×.022 occlusal slot which any other edgewise appliances do not have. This special slot design facilitates wire bending and insection. It also help provide optimal and right direction of orthodontic force. The author will show a 2mm Angle Class II extraction case treated with this appliance. The treatment goal is to improve molar relationship after removing 7mm crowdings.
