per arch) that divide the mouth into four equal parts.
Quadrant means one fourth, and each quadrant is one
fourth of the entire mouth. Teeth are described as
being located in one of the four quadrants: right
maxillary quadrant, left maxillary quadrant, right
mandibular quadrant, or the left mandibular quadrant.
LOCATION OF THE TEETH
Normally, a human receives two sets of teeth
during a lifetime. The first (deciduous or primary) set
consists of 20 teeth (baby teeth). The second
(permanent) set usually consists of 32 teeth. In each
quadrant, there are eight permanent teeth: two incisors,
one cuspid, two bicuspids, and three molars (fig. 4-14).
The tooth positioned immediately to the side of the
midline is the central incisor, so called because it
occupies a central location in the arch. To the side of
the central incisor is the lateral incisor. Next is the
cuspid, then the two bicuspids (the first bicuspid,
followed by the second bicuspid). The last teeth are
three molars. After the second bicuspid comes the first
molar, followed by the second molar, followed by the
Figure 4-14.Names of the teeth in the right maxillary and mandibular quadrants; anterior and posterior teeth.