Displacement and stress distribution of Kilroy spring and nickel-titanium closed-coil spring during traction of palatally impacted canine: A 3-dimensional finite element analysis.

Objective: To compare the stress distribution and initial displacements during traction of palatally impacted canine between Kilroy and nickel-titanium (NiTi) closed-coil springs by means of the finite element analysis.

Setting And Sample Population: A finite element method analysis of two traction methods for a maxillary impacted canine.

Materials And Methods: The corresponding periodontal ligaments (PDLs), brackets, molar tubes and a 0.