To evaluate the fit of the wires on the dental arches quantitatively,
each wire was superimposed on each dental arch. The
error in fit was computed as the difference (in cm) between
each landmark on the arch form and the corresponding point
on the wire along the line-joining point (s1) and the corresponding
landmark (Fig. 2). Computed errors were considerednegative if the wire was to the inside of the arch form and positive
otherwise.