[Lingual orthodontics: a system for positioning the appliances in the laboratory].

The author presents the advantages and the drawbacks of two systems of lingual brackets positioning which allows to obtain a very good finish of the treatments. The Class System is a protocol made from a Set-Up but which does not allow the bonding of the teeth with unfilled resins. The other system uses the T.A.R.G. with the Thicknesses Measure Appliance and the Ideal Drawing of Lingual Arch program; it allows to program the torque, the angulations, the heights and the thicknesses (from the bottom of the throat to the vestibular side) of each tooth.