Linear regression equations for the prediction of
the mesiodistal widths of unerupted canines and
premolars were calculated for a large sample of
recent orthodontic patients. The form of the equations,
as well as the size of the various confidence
belts, were generally similar to those in the widely
used but incompletely characterized Michigan
Mixed Dentition Analysis. Although either set of tables
would seem equally appropriate, a simple approximation—
half the width of the mandibular incisors
plus either 11.0 for the maxillary canine-premolar
segments, or 10.5 for the mandibular segments—
is of comparable accuracy.
The