Page 41 - My FlipBook
P. 41
:
:
: :
:
NOMENCLATUBE. 13
on account of their triangular form, but three angles instead
of four. They have —
First set of line angles
A labio-gingival angle,
A linguo-gingival angle,
*An incisal angle.
Second set of line angles
An axio-labial angle,
An axio-lingual angle,
An axio-gingival angle.
Point angles
An axio-labio-gingival angle.
An axio-linguo-gingival angle,
*An axio-incisal angle.
In mesial and distal cavities in the incisors and cuspids
involving the loss of the incisal angle 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 —
First set of line angles
A mesio- (or disto-) labial angle,
A mesio- (or disto-) lingual angle.
Second set of line angles
A pulpo-distal (or mesial) angle,
A pulpo-lingual angle,
A pulpo-labial angle,
A pulpo-axial angle.
Point angles:
A mesio- (or disto-) labio-pulpal angle,
A mesio- (or disto-) linguo-pulpal angle.
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
name the point angles in any directions for cavity preparation
or in cavity description.
These lists of cavity angles may seem long and tedious,
but it must be remembered that in any directions for the prep-
aration of cavities, or in cavity descriptions, very few of them
* 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 line
angle, for it is formed by the junction of the labial and lingual walls. In like manner
the axio-incisal point angle would be the axio-labio-lingual angle. This latter is
formed by the junction of the labial, lingual and axial walls, but is never called by
the compound name formed by these words. The name, incisal angle, is distinctive
and gives rise to no confusion.
:
: :
:
NOMENCLATUBE. 13
on account of their triangular form, but three angles instead
of four. They have —
First set of line angles
A labio-gingival angle,
A linguo-gingival angle,
*An incisal angle.
Second set of line angles
An axio-labial angle,
An axio-lingual angle,
An axio-gingival angle.
Point angles
An axio-labio-gingival angle.
An axio-linguo-gingival angle,
*An axio-incisal angle.
In mesial and distal cavities in the incisors and cuspids
involving the loss of the incisal angle 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 —
First set of line angles
A mesio- (or disto-) labial angle,
A mesio- (or disto-) lingual angle.
Second set of line angles
A pulpo-distal (or mesial) angle,
A pulpo-lingual angle,
A pulpo-labial angle,
A pulpo-axial angle.
Point angles:
A mesio- (or disto-) labio-pulpal angle,
A mesio- (or disto-) linguo-pulpal angle.
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
name the point angles in any directions for cavity preparation
or in cavity description.
These lists of cavity angles may seem long and tedious,
but it must be remembered that in any directions for the prep-
aration of cavities, or in cavity descriptions, very few of them
* 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 line
angle, for it is formed by the junction of the labial and lingual walls. In like manner
the axio-incisal point angle would be the axio-labio-lingual angle. This latter is
formed by the junction of the labial, lingual and axial walls, but is never called by
the compound name formed by these words. The name, incisal angle, is distinctive
and gives rise to no confusion.
