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GLOSSAEY OF TECHNICAL TEEMS AND PHRASES.
285
Centigrade One hundredth part of a circle. An angle of twenty-five centi-
grades is a right angle and equals ninety degrees of the astronomical circle, or eight
manner's circle. One centigrade equals three and
decrees" six tenths (3 6)
Ceevical. a Pertaining to the cervix or neck. Used formerly
somewhat similar to that m which gingival is now used. in a sense
See Gingival.
Cervix, n. Neck
The portion of the crown of the tooth near its junction with
the root has been called the cervix, or neck.
??" ''''«/°°- 1° dentistry this is reckoned from the first appearance of
f»ot^^'''':-f
teeth until the roots of
all of the permanent teeth, except the third molars, have
been completely formed. It is only after that time that the teeth can bo treated
m a 1 respects as the teeth of the adult.
This is usually about the fifteenth or six-
teenth year.
Childhood period op the permanent teeth.
The period from the first appear-
mXs SeVpTgTreTsVrVoL r*" '^"" ""'*' ^"^ ^""^ completed, except the' third
Chitin. The hard shell-like covering of insects.
Chitinoid. Chitin-Iike; resembling the hard covering of insects.
Chitinous.
Consisting of or resembling the hard covering of insects.
Clamp forceps. A special forceps for placing the rubber dam clamp.
®"^ber dam. An instrument made to set on teeth over the rubber dam
* v,*1j^^^'-
to hold It m place, or over which the rubber dam may be thrown.
It is made of
spring steel and m applying it, it is opened with a special forceps, placed in position
and allowed to close on the tooth with the force of its spring.
Classipication op cavities into artificial groups.
In a classification of cav-
ities, it IS the intention to group together in classes cavities of decay that require
a similar line of treatment, in order that these may be more closely associated.
Class 1. Cavities beginning in structural defects in the teeth;
pits and fissures
These are located m the occlusal surfaces of the bicuspids and molars, in the occlusal
two-thirds of the buccal surfaces of the molars, in the lingual surfaces of the upoer
mcisors, and occasionally in the lingual surfaces of the upper molars.
Class 2. Cavities in the proximal surfaces of the bicuspids and molars.
Class 3. Cavities in the proximal surfaces of the
incisors and cuspids which
do not involve the removal and restoration of the incisal angle.
Class 4. Cavities in the proximal surfaces of the
tne removal and restoration of the incisal angle. incisors which do require
Class 5. Cavities in the gingival third — not pit cavities - of the labial, buccal
or Ungual surfaces of the teeth.
f^lasses 2, 3, 4 and 5 are all smooth-surface cavities.
_ They aU occur in positions
m which the surfaces of the teeth are habitually unclean.
Class name,_ of an instrument.
_ A name appUed to a definite class of cuttine
instruments describing the form of blade;
as hatchet, hoe, spoon, etc.
Cleavage. The Une of easy splitting of crystalline or stratified substances.
To
split along the length of the grain;
as in splitting wood. The act of splitting the
enamel m 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, Hke.) A claw-like instrument
used m excavating cavities.
Clot. n. A soft, semi-solidified mass, as of blood or lymph.