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GLOSSAEY OF TECHNICAL TEEMS AND PHBASES. 293
Grasps, rubber dam. See Rubber dam grasps.
Groove. A long-shaped depression in the surface of a tooth.
Gums. The harder fleshy covering of the bones of the mouth, particularly of
the roof of the mouth and the alveolar processes. See Gingiva.
Gum septums. That portion of the gums or gingivaa that occupies the inter-
proximal spaces.
Hatch clamp. So called after the person who designed it. A rubber dam clamp
of special pattern for use in treating gingival third cavities. It may be used on all
teeth except the molars.
Haversian bone. Bone composed of Haversian systems.
Haversian canal. Histology, A canal which occupies the center of a Haversian
system.
Haversian system. Histology. A long, cylindrical area in bone, usually placed
lengthwise of the long bones, composed of a central canal surrounded by a number
of concentric rings or layers of bone corpuscles.
Hemorrhage. Escape of blood from the blood vessels. Capillary H., from the
capillaries. Venous H., from the veins. Arterial H., from the arteries.
Hemostatic. A medicinal agent that checks or arrests the flow of blood.
Horizontal plane. A plane through any part of a tooth at right angles to its
length. See Figure 9, Vol. 2.
Horn. A slender, or blunt pointed process of the pulp of a tooth extending
toward the point of a cusp is called a horn of the pulp, or a pulpal horn.
Horn of the pulp. A process of pulp tissue extending toward the cusp of a
tooth.
Horn. A slender, or blunt pointed process of the pulp of a tooth extending
toward a cusp. It is, in normal conditions, occupied by the horn of the pulp.
Hyperemia. An excess of blood in the blood vessels of a part. Active hyperemia,
an excessive inflow of blood to a part. Passive hyperemia, diminished outflow of
blood from a part; or a filling of the tissues of a part with blood because of some
interference with the circulation of the blood through the part. These are also called
arterial hyperemia and venous hyperemia.
Hyperesthesia. Abnormally increased sensitiveness to painful impressions.
Hypersensitive. Excessive sensibility to irritation, thermal, chemical or mechan-
ical. Hypersensitive pulp. Hypersensitive dentin. See Hyposensitive.
Hypersensitiveness. A condition of abnormally increased sensitiveness to
pain, or abnormally increased pain from definite causes which usually excite pain.
See Hypoesthesia.
Hypoesthesia. Diminished sensitiveness to impressions which usually excite
pain.
Hypoplasia. Abnormally diminished growth of a part. A partial failure of
development because of lack of the ordinary full and complete growth. Syn. Atrophy.
Hyposensitiveness. Abnormally diminished pain from definite causes which
excite pain.
Hutchinson tooth. An incisor tooth presenting a notch or defect in the cen-
tral portion of the incisal edge, caused by atrophy.
Immediate root filling. Root filling inserted immediately after removal of the
pulp of the tooth.