Frictional Resistance of the Damon SL Bracket

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Fig. 1 A. Testing apparatus. B. Bracket-wire setup in testing apparatus (1 = C-shape rod connected to chuck and load cell; 2 = bracket-wire assembly mounted on plastic pedestal; 3 = stainless steel rod with plastic pedestal attached; 4 = roller bearings for linear and rotational displacements; 5 = wing nuts to hold wire and plastic pedestal).

Fig. 2 Mean kinetic frictional forces (DB = Damon SL bracket; MT = Mini-Twin bracket; SS = stainless steel wire; NiTi = nickel titanium wire).

Fig. 3 Scanning electron microscopic views of Damon SL bracket with closed spring clip (A) and conventional Mini-Twin bracket (B).

Fig. 4 Scanning electron microscopic views of .019" × .025" stainless steel archwires held in Damon SL bracket slot by spring clip (A) and in Mini-Twin bracket slot by elastomeric ligature (B).

Fig. 5 Scanning electron microscopic views of Damon SL bracket slot surface. A. 100× magnification. B. 300× magnification.

Fig. 6 Scanning electron microscopic views of Mini-Twin bracket slot surface. A. 100× magnification. B. 300× magnification.

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