Fig. 5From: Dual-section versus conventional archwire for en-masse retraction of anterior teeth with direct skeletal anchorage: a finite element analysisFrictional resistance generated at the interface between the archwire and the tubes and brackets on the posterior teeth with a 0.019 × 0.025-in archwire and dual-section archwire as a function of the remaining extraction space. Frictional resistance less than 0.1 N was observed in both casesBack to article page