[Clinical study of Twin-wires on anchorage on canine retraction].
OBJECTIVE
The purpose of the study was to evaluate the effects of anchorage by Twin-wires on canine retraction.


METHODS
A sample of 15 patients with severe anterior crowding was selected (6 males, 9 females, age average: 13.7 years). All patients underwent removal of the four first premolars during orthodontic treatment. Retraction of canine was achieved by using 0.018 stainless steel wire and NiTi wire. Anchorage reinforcement as a result of this movement was evaluated. The length and width of the dental arch models were measured. Self-control t test was used for data analysis.


RESULTS
The length and width of the dental arches, the canine and molar relationships remained unchanged after orthodontic treatment.


CONCLUSIONS
Application of Twin-wires leads to canine retraction and sufficient anchorage consolidation.
Wang
Guo-hua
GH
Department of Stomatology, Shanghai Putuo Central Hospital, Shanghai, China. drwanggh@126.com
Liu
Ping
P
Ou
Yang-ming
YM
D000293:Adolescent; D001641:Bicuspid / Q000601:surgery; D003481:Cuspid; D003724:Dental Arch; D003764:Dental Materials; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000628:therapy*; D003765:Models, Dental; D009532:Nickel; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D009969:Orthodontic Wires; D013193:Stainless Steel; D014025:Titanium; D014087:Tooth Movement Techniques / Q000295:instrumentation*
D003764:Dental Materials; C040654:titanium nickelide; D013193:Stainless Steel; D009532:Nickel; D014025:Titanium