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16 THE TECHNICAL PROCEDURES IN FILLING TEETH.

An axio-gingival angle
An axio-mesial angle
An axio-distal angle 2d set of line angles.
An axio-incisal angle
An axio-mesio-gingival angle
An axio-disto-ginofival angfle • ^ .
. ° ? ^ Point angles.
. . "^ ,
An axio-mesio-incisal angle ;
An axio-disto-incisal angle
J
Mesial and distal cavities in the incisors and cuspids have,
on account of their triangular form, but three angles instead of
four. They have
A labio-gingival angle -\
A linguo-gingival angle C ist set of line angles.
*An incisal angle J
An axio-labial angle ^
An axio-lingual angle y 2d set of line angles.
An axio-gingival angle 3
An axio-labio-gingival angle "\
An axio-linguo-gingival angle [- Point angles.
An axio-incisal angle )
In mesial and distal cavities in the incisors and cuspids
involving the loss of the incisal angle, or corner of the tooth,
the incisal angle and the axio-incisal angle will be missing and
the incisal step when formed will have its set of angles. These
are —
A pulpo-distal (or mesial) angle
^
A pulpo-lingual angle
> ist set of line angles.
A pulpo-labial angle
A pulpo-axial angle
J
A mesio- (or disto-) labial angle) ^ ,.
,
,
/,. 1 ^ 2d set of Ime angles.
^ ,. ,
A mesio- (or disto-) Imgual angle
j
A mesio- (or disto-) labio-pulpal angle
1- N 1- 11 1 / Point angles.
A mesio- (or disto-) linguo-pulpal angle
j
While all angles are theoretically and actually present as
named, and according to the rules given and illustrated, these
incisal steps are so narrow that it would rarely be desirable to
*NoTE.— The incisal angle given here is the one exception to the rule of naming
cavity angles. If the rule were followed strictly it would be the labio-lingual angle, for
it is formed by the junction of these two walls. However, the name, incisal angle, can
not be mistaken.