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Address correspondence to Dr. P. Emile Rossouw, BSc, BChD, BChD (Hons), MChD, PhD, FRCD(C), Professor and Clinic Director, Department of Orthodontics, Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, TX 75246, USA
Affiliations
Department of Orthodontics, Baylor College of Dentistry, Dallas, TX, USA
Binding of the bracket on the guiding archwire (bracket-archwire interface) occurs
through a series of tipping and uprighting movements (Figure 1, Figure 2, Figure 3); it signifies orthodontic tooth movement, moreover, it creates friction.
Figure 1A patient with congenitally absent maxillary lateral incisors; the treatment objective
is to utilize the maxillary canine in the lateral incisor position. Friction is needed
to rotate and upright this mal-positioned canine. Note the figure 8 ligation of the
central incisors to prevent inappropriate movement, an example of creating advantageous
friction. Bracket design differences, as well as method of ligation, influence the
amount of friction.
Figure 2A continuation of treatment also necessitates uprighting of the canine in pursuit
of an ideal root-crown relationship. The frictionless posterior wire-bracket interface
allows the archwire to gently slide posteriorly and protrude distally from the maxillary
molar buccal tube.
Figure 3The maxillary canine is in position as a replacement for the lateral incisor and ready
for esthetic recontouring where needed. These goals were attained by utilizing both
friction and/or no friction as part of the clinical treatment mechanotherapy.
