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By Dr. Adrian J. Palencar, MUDr, MAGD, IBO, FADI, FPFA, FICD
The Mulligan Extrusion arch is a two-couple extrusion arch wire used for control of anterior open bite It is commonly made with round wire (a .020 or a .018 SS), attached to the teeth only at the molars and the incisors and is activated for incisor extrusion by a molar tip-forward (off-center, gable) bend. Dr. Mulligan used a .020 ss arch wire, however, the author prefers a .018 SS arch wire – as there is less friction and biding.