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306 PATHOLOGY OF THE HAKD TISSUES OF THE TEETH.

Triangular ridge. A ridge running from the point of a cusp toward the cen-
tral portion of the occlusal surface of a tooth.
Trypsin. One of the enzymes. See Enzyme.
Tubercle. A slight rounded elevation on the surface of a tooth. Tubercles
occur frequently on the linguo-gingival ridge of the incisors, and occasionally upon
various parts of other teeth. They are deviations from the typical tooth forms.
Tubules. (PI. Tubuli.) The minute tubular canals vt-hieh radiate from the pulp
chamber and canals through the dentin to the dento-enamel junction in the crown
and to the dento-cemental junction in the root of the tooth.
Ulitis. a general inflammation of the gums as distinguished from gingivitus,
which is confined to the free margins of the gums and immediate neighborhood.
Viscous saliva. Saliva that is noticeably thick or gummy. Usually the saliva
is a very thin, watery fluid, but some persons have saliva that has so large a pro-
portion of mucus that it is thick and tenacious to a very noticeable degree. See
Ropy Saliva.
Whorls. Circular forms or segments of circular forms with the form elements
arranged somewhat after the plan of the spokes of a wheel. Or form elements
arranged around a center.
Zones op injury. Said particularly of the injuries of the teeth in atrophy.
These injuries are spread in sheets or zones through certain parts of the enamel and
dentin.
ZooGLEA. A colony of microorganisms imbedded in a viscous gelatinous sub-
stance.