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Related to arch width: Arch wire
the distance between the left and right opposite in the upper or lower jaw, usually expressed in millimeters. The intercanine, interpremolar, or intermolar distance may be cited as the arch width.
The measured distance between the canines, bicuspids, and the first molars. These distances establish the shape and size of the dental arch.
arch width(ahrch width)
Distance in a straight line between canine teeth.