Page 560 - My FlipBook

302 PATHOLOGY OP THE HAED TISSUES OF THE TEETH.

Proximal contact. The contact, or touching, of the proximal surfaces of
neighboring teeth.
Peoximal sdeface. The surface of a tooth which lies next to another tooth,
to the mesial or to the distal.
Proximate. Formerly used instead of proximal. See Proximal.
Proximating. a tooth or portion of the surface of a tooth making near
approach to another tooth or portion of the surface of another tooth.
Proximation. The near approach, or contact, of the proximal surfaces of the
teeth.
Pulp. The soft tissue that fills the pulp chambers and root canals of the teeth.
It is the formative organ of the dentin.
Pulp canal. The central opening lengthwise in the root of a tooth leading
from the pulp chamber or bulb of the pulp in the crown portion of a tooth to the
apical end of the root. Syn. Root Canal.
Pulp chamber. The central opening in the dentin of the crown portion of a
tooth which is occupied by the pulp of the tooth. In the double and triple-rooted
teeth, the pulp chambers are very distinct from the root canals, but in teeth having
but one root the pulp chamber is not distinctly divided from the root canal.
Pulpitis. Inflammation of the dental pulp.
Putrefaction. Putrefactive fermentation. Decomposition with a foul odor
of animal or vegetable matter, effected by the action of microorganisms. The true
putrefactions occur only when oxygen is excluded, but decompositions of a somewhat
similar nature occur in the presence of oxygen.
Putrescent. A state of decomposition with emission of foul odor.
Pyogenic. Said of a microorganism that generates pus, or causes pus forma-
tion. The staphylococcus albus, staphylococcus aureus, streptococcus longus, etc., are
pus-generating microorganisms. They are therefore pyogenic.
Pyorrhea. A flow of pus. ' ' Pyorrhea alveolaris. ' ' A flow of pus from the
alveoli of the teeth.
Quadrangle. In instrument nomenclature designates an instrument mth four
angles or curves in the shank.
Range. Sizes of instruments or angles of their blades on definite comparative
gradations.
Ee. In the matter of, referring to. Murray.
Resistance form. In cavity preparation; the shape given to the internal parts
of a cavity to afford such a seat for the filling as will best enable it to withstand
great stress without movement.
Besoeption. The act of absorbing again. There has been an effort to use this
word in a special sense, or to apply it to special kinds of absorptions, which seems
not to have been very successful. Some writers use it in speaking of the absorption
of the roots of the deciduous teeth.
Retention form. In cavity preparation; the form of the internal parts of a
cavity provided to prevent the displacement of the filling by force.
Retzius, calcificvtion lines of. See Lines of Accretion.
Ridge. A long-shaped elevation on the surface of a tooth.
Boot. That portion of the tooth that is fixed in the alveolus, or socket, and is
covered with cementum.