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NOMENCLATURE. 13
A gingival wall, and
An incisal wall.
Angles of Cavities.
In naming cavity walls and angles the typical idea of the
cavity is that of a cuboid space or the form of a box. And no
matter how irregular the actual form of the cavity, its walls and
angles are named as if the form were regular.
Each simple cavity has two sets of line angles, and one set of
point angles.
Rule : All line angles are formed by the junction of
two walls along a line, and are named by combining
the names of the walls joining to form the angle. They
are, therefore, named in two terms.
Rule : All point angles are formed by the junction
of three walls at a point, and are named by joining the
names of the walls forming the angle. They are, there-
fore, named in three terms.
In simple cavities one set of line angles are formed by the
junction of the four surrounding walls with each other, and form
lines which run from the enamel margin to the floor or pulpal
A
wall in occlusal cavities, or to the axial wall in axial cavities.
second set of line angles are formed by the junction of the sur-
rounding walls with the floor, or pulpal wall in occlusal cavities,
or with the axial wall in cavities in the axial surfaces of the
teeth. These are called the pulpal line angles, and the axial
line angles, respectively.
The point angles are formed in those corners where the one
set of line angles meet the other set at the corners of the cavity.
The broader rule for naming angles to which there is but a single
exception, is :
Rule : All angles of cavities are named by combin-
ing the names of the walls joining to form the angle.
Illustrations : (Each angle named is formed by the junction
of the walls, the names of which enter into tlie name of the
angle.
Occlusal cavities have —
A mesio-buccal angle ^
A mesio-lingual angle I
, , .
r
. ,. , , ; ist set. ) Line angles.
A disto-buccal angle j '
A disto-lingual angle
NOMENCLATURE. 13
A gingival wall, and
An incisal wall.
Angles of Cavities.
In naming cavity walls and angles the typical idea of the
cavity is that of a cuboid space or the form of a box. And no
matter how irregular the actual form of the cavity, its walls and
angles are named as if the form were regular.
Each simple cavity has two sets of line angles, and one set of
point angles.
Rule : All line angles are formed by the junction of
two walls along a line, and are named by combining
the names of the walls joining to form the angle. They
are, therefore, named in two terms.
Rule : All point angles are formed by the junction
of three walls at a point, and are named by joining the
names of the walls forming the angle. They are, there-
fore, named in three terms.
In simple cavities one set of line angles are formed by the
junction of the four surrounding walls with each other, and form
lines which run from the enamel margin to the floor or pulpal
A
wall in occlusal cavities, or to the axial wall in axial cavities.
second set of line angles are formed by the junction of the sur-
rounding walls with the floor, or pulpal wall in occlusal cavities,
or with the axial wall in cavities in the axial surfaces of the
teeth. These are called the pulpal line angles, and the axial
line angles, respectively.
The point angles are formed in those corners where the one
set of line angles meet the other set at the corners of the cavity.
The broader rule for naming angles to which there is but a single
exception, is :
Rule : All angles of cavities are named by combin-
ing the names of the walls joining to form the angle.
Illustrations : (Each angle named is formed by the junction
of the walls, the names of which enter into tlie name of the
angle.
Occlusal cavities have —
A mesio-buccal angle ^
A mesio-lingual angle I
, , .
r
. ,. , , ; ist set. ) Line angles.
A disto-buccal angle j '
A disto-lingual angle
