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Table 6 Theoretical torque loss for different square and rectangular archwires in 0.018- and 0.022-in. bracket slots (all with nominal dimensions—based on Dellinger [13])

From: Torque efficiency of square and rectangular archwires into 0.018 and 0.022 in. conventional brackets

Wire cross-section Wire size (in.) Slot size (in.) Calculated torque loss (degrees)
Square/rectangular 0.018 × 0.018/0.022/0.025 0.018 0
Square 0.019 × 0.019 0.022 9.96
Rectangular 0.019 × 0.022 0.022 8.37
Rectangular 0.019 × 0.025 0.022 7.24