Asymmetric space closure.
In a vertically slotted 0.022 X 0.028 inch edgewise system, the use of a two-dimensional ribbon arch--0.022 X 0.016 inch from lateral incisor to lateral incisor and 0.016 X 0.022 inch from the canine to the molars--plus an uprighting spring on the canine maintained incisor position while unilaterally protracting a molar-premolar unit by means of sliding mechanics. Five degrees of labial crown torque was placed in the incisor portion of the wire and the uprighting spring exerted a force of 200 to 250 g. The intra-arch force applied to protract the molar--premolar unit was 300 to 350 g.
Gianelly
A A
AA
Smith
J B
JB
Bednar
J R
JR
Dietz
V S
VS
D000293:Adolescent; D003970:Diastema / Q000628:therapy*; D004867:Equipment Design; D006801:Humans; D008297:Male; D009967:Orthodontic Appliances; D014087:Tooth Movement Techniques / Q000295:instrumentation* / Q000379:methods