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for free. This is an OCR edition with typos. Excerpt from book: THE
NUMBER, ARRANGEMENT, AND USES OF THE ADULT TEETH. The total number
of teeth in the adult is thirty-two. Mr. Hunter1 speaks of
considerable variations in this respect, arising as he says, from
the occasional absence of the last grinder above or below, on one
or both sides. There is, however, every reason to believe that this
tooth is as constantly formed in the jaw as the others, and still
more so than some to which I shall hereafter refer; but in the
cases related by him, they probably had not yet made their
appearance; as I have known them, in some instances, come through
the gums as late as sixty and even seventy years of age. The teeth
are arranged. in perfect uniformity in each jaw, eight on each side
of the symphisis of the lower, and of the maxillary suture in the
upper, those of one side exactly corresponding with those of the
opposite. They are divided into four distinct classes; namely, on
each side of either jaw two incisores, one cuspidatus, two bi-
cuspides, and three molares; and these classes differ from each
other in size, form, articulation, and use. OF THE INCISOKES." The
incisores, or cutting-teeth, are situated in the anterior part of
the jaw, forming the centre of themaxillary arch. Each has but one
root. The body of an incisor, viewed laterally, is wedge-shaped; it
has an anterior and posterior flattened surface, which converge and
form a cutting edge at the extremity. The anterior surface is
somewhat convex, and perpendicular to the edge of the alveolus; the
posterior more or less concave, but with the concavity interrupted
by a projecting tubercle, and sloping forwards from the neck to the
edge. In a front view, the edge is the broadest part: it decreases
in breadth towards the neck, and continues tapering to the
extremity of the root. Bu...
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