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296 PATHOLOGY OF THE HARD TISSUES OF THE TEETH.
Malposed. Out of the correct or norma) position.
Malposition. Any wrong position; abnormal position.
Mammelons. The three rounded prominences seen on the cutting edges of the
incisors when they first come through the gums.— Magitot.
Mandrel. A shaft or spindle in which a disk or stone is held for rotation.
Used in the dental engine.
Manudynamojif.ter. An instrument, by which the force exerted by an instru-
ment thrust may be measured. See Fig. 31, Vol. II.
Marginal lines, of a cavity. The lines of the cavity outline.
Marginal ridge. The ridges, or elevations of enamel on the margins of the
occlusal surfaces of the bicuspids and molars, and on the mesial and distal margini
of the lingual surface of the incisors and cuspids.
Massage. Systematic friction for the purpose of preventing or curing disease.
Friction of the gums with the finger, or specially designed brush, as a prophylactic
measure.
Masticate, v. To chew food. To reduce food to a pulp by trituration and
mixing with solvents, as in chewing and in the insalivation of food in the mouth.
Mastication, n. The act of chewing; the triturating of the solid foodstuffs
between the teeth, by which they are reduced to a pulpy mass. One of the functions
of the teeth.
Matrix. A mold in which anything is formed. A thin sheet of metal closely
fastened on a tooth to form a fourth surrounding wall of a proximal cavity in a
tooth. A platinum or gold lining of a cavity in which a porcelain or gold inlay is
baked or fused. The mold formed of an investment into which gold or other metals
are cast.
Median line. The anterior-posterior perpendicular central line of the body.
Meslu.. Toward the median line. Those surfaces of the teeth which, as they
stand in the arch, and following its curve, are toward the median line, are called
mesial surfaces.
Mesial angle. A contraction of mesio-incisal angle, also of mesio-bucco-occlusal
angle (q. v.)
Mesial cavities. Cavities in the mesial surfaces of the teeth.
Mesial inclination. An inclination or leaning of a tooth mesially.
Mesiallt. A direction toward the median line following the curve of the arch
formed by the teeth.
Mesio-buccal angle. The angle formed by the union of the mesial and buccal
surfaces of the bicuspids and molars.
Mesio-bucco-occlusal angle. The angle formed by the junction of the mesial,
buccal and occlusal surfaces of the bicuspids and molars at a point.
Mesio-distal. From mesial to distal; as, the mesio-distal diameter of the
lower first molar.
Mesio-distally. A direction from the mesial toward the distal following the
curve of the dental arch.
Mesio-distal plane. A contraction of axio-mesio-distal plane (q. v.).
Mesio-incisal angle. The angle formed by the junction of the mesial surface
and cutting edge, or incisal surface, in the incisors and cuspids.
Mesio-labial angle. The angle formed by the union of the mesial and labial
surfaces of the incisors and cuspids.