Orthotown December 2020 - 44

Fig. 1

SLOP

Materials and methods
The degree of theoretical torque loss, or slop, can be defined mathematically as the angle created between the
buccal-lingual dimension of the bracket slot and the depth of the archwire (Fig. 1). Variables affecting slop include
bracket slot height (S), height of archwire (H) and depth of archwire (D). The slop angle can be calculated by finding
the difference between angles θ and γ, as depicted in Fig. 1.

The formula was used to determine theoretical torque loss using various sizes of rectangular and square-shaped
archwire applied in Edgewise systems with bracket slot heights of 0.018 inch and 0.022 inch. The values were obtained
using Microsoft Excel; the Excel formula used was configured with inputs of height of bracket slot in column S,
height of wire in column H, and depth of wire in column D.

44

DECEMBER 2020 // orthotown.com

OT1220_Michalczyk_CE-Bracket-Slop.indd 44

11/24/20 9:59 AM



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Orthotown December 2020

Table of Contents for the Digital Edition of Orthotown December 2020

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