[A clinical study of twin-wires on anchorage reinforcement].
OBJECTIVE
This clinical trial was designed to impose a simultaneous placement of large-size stainless steel round wire and small-size NiTi, and to assess its effect on anchorage reinforcement.


METHODS
Twin-arch wires were in place for relief of severe crowding. Distalization of canines were well conducted with support of rigid wire, together with a simultaneous repositioning of upper lateral incisors facilitated by resilient wire. The linear distance between APo and the first molar, together with other parameters, was measured for the evaluation of anchorage consolidation.


RESULTS
Anchorage molars and anteriors, as well as the integrity of dental arches remained unchanged upon fulfillment of crowding relief, which was justified by statistical analysis.


CONCLUSIONS
Application of Twin-wires leads to a concurrence of efficient crowding relief and sufficient anchorage consolidation.
Department of Orthodontics, Ninth People's Hospital, School of Stomatology, Shanghai Second Medical University, Shanghai 200011, China. gangshen@orthosh.com
Gang
G
Shen
Rong-jing
RJ
Chen
Kai-min
KM
Ding
Xiao-jin
XJ
Dong