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286 PATHOLOGY OF THE HAED TISSUES OF THE TEETH.
enamel in a certain direction following the length of the enamel rods which form
its cleavage lines.
Cleave. To split.
Cleoid. (From cle, old Saxon for claw, and oid, like.) A claw-like instrument
used in excavating cavities.
Clot. n. A soft, semi-solidified mass, as of blood or lymph.
Coagulate, v. To form a coagulum or clot.
Coagulation. The process of forming a clot or coagulum.
Coagulum. n. A clot. A soft semi-solidified mass, as of blood or lymph.
Coccus. (PI. Cocci.) A spherical or nearly spherical bacterium.
Cohesion. The act or state of sticking together; close union. That form of
attraction by which the particles of a body are united throughout the mass, particle
to particle. This must be distinguished from adhesion, which unites bodies by their
surfaces only. It is only bodies that have a common property, as simple elements,
compounds or alloys formed of them, that cohere.
Cohesive. A property of annealed gold (foil or crystal) which causes separate
particles to stick to one another, as they are welded, when placed in contact by heavy
hand or mallet pressure.
Cohesive gold. Gold in the form of foil or crystals, the surfaces of which are
clean and free from condensed gases or salts so that they may be brought into actual
contact. Gold foil or crystals in which the welding property is partially or fully
"
developed.
Complex cavity. A cavity involving two or more surfaces of a tooth, as a disto-
occlusal cavity.
Contact point. The point on the proximal surface of a tooth which touches a
neighboring tooth.
Contemporaneous. Living, occurring or existing at the same time; said of per-
sons, events or things.
Contemporaneous accretional dystrophy. A deformity occurring along the
lines of accretion in all of the parts (of the teeth) in process of development at a
particular time, or during a period of malnutrition.
Contemporaneous calcification lines. The portions of the several teeth
which are undergoing calcification at the same time. A representation of the por-
tions of the several teeth undergoing calcification at the same time by drawing
lines over pictures or diagrams of the teeth.
Contour, n. The line bounding a figure or body, as the contour of a tooth.
Contour, v. To make a contour or outline of. To restore the original outline
of a carious tooth by filling.
Contea-angle. Angles formed in the shank of an instrument, first backward
from the direction of the cutting edge and then forward to form the blade in order
that the working edge may be placed near the long axis of the handle. There are
binangle and triple-angle contra-angles.
Contra-angle hand-piece, for the dental engine. A hand-piece with a contra-
angle to enable one to reach positions difficult or impossible with a straight hand-
piece. See Figure 25, Vol. 2.
Convenience form. In cavity preparation: Such special form as may be
given to special points of the internal parts of cavities as will render the placing
of the filling more convenient.
Convenience point. A small depression or undercut to make the starting of
a filling more convenient. See Figures 170-173, Vol. 2.