“…However, in spite of incorporating ideal
torque characteristics in the structure of such brackets, in some cases it is
necessary to apply additional or individual torques on some teeth. This would occur
due to several factors 10,27 : mechanical side-effects 25 , morphological differences in the
buccal faces of teeth 4,6,9,21,22,26 , changes
in the position of the brackets 2,16,22,29 , different
methods of bracket manufacturing 12,30 and orthodontic wires 24 , the play between the wire and the
bracket slot 3,4,7,16,24,25 , variations in
the bracket designs 8 , properties
of the materials constituting the brackets 7,8,11,13,23 and wires 24 and differences between the value
of the torque informed by the manufacturer and the real value of the torque of the
brackets 10 .…”