Straight-Wire Bracket Prescription — NDEB AFK MCQ
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Correct answer: B — Built-in tip (angulation), torque (inclination), and in-out (thickness) values specific to each tooth position, designed to produce ideal tooth positions with a straight archwire
In the straight-wire (pre-adjusted) appliance system (Andrews, 1970s), each bracket has specific built-in values for tip (mesiodistal angulation), torque (labiolingual/buccolingual inclination), and in-out (bracket base thickness) that correspond to the ideal final tooth position for that specific tooth. When a straight archwire is fully engaged in all bracket slots, the built-in prescription expresses these values, theoretically producing ideal alignment without wire bending. Different prescriptions exist (Roth, MBT, Andrews) with slightly different values.
Reference: Proffit – Contemporary Orthodontics, 6th ed., 2019