Subject(s)
Molar , Orthodontic Wires , Tooth Movement Techniques/instrumentation , Child , Elasticity , Female , Humans , Malocclusion, Angle Class II/therapy , Maxilla , Nickel , TitaniumABSTRACT
Japanese NiTi superelastic coils, exerting 100 gm of force, were compressed against the maxillary first molars and moved the molars distally 1 to 1.5 mm/month. Anchorage was obtained with a modified Nance appliance cemented onto the first premolars in conjunction with a fixed appliance.
Subject(s)
Dental Alloys , Molar , Nickel , Orthodontic Appliances , Titanium , Tooth Movement Techniques/instrumentation , Bicuspid , Equipment Design , Humans , Incisor , Japan , MaxillaABSTRACT
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.
