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CAVITY NOMENCLATURE 27
the axial, labial and lingual walls in proximal cavities in the six
anterior teeth is, for convenience, named the "incisal angle."
A simple cavity has two sets of line angles. First, the internal
line angles surrounding the internal Avail, which is the axial wall
in axial surface cavities, and the pulpal wall in occlusal cavities.
The second set of external line angles is formed by the junc-
tion of the outside walls with each other.
The enamel margin is that point on the surface of the tooth
where the cavity begins in enamel.
;\\vsjc5^^^^v;^i,:^
I'"ig. 12. A, Kxternal enamel surface; B, Cavo-surface angle; C, Marginal bevel; D, Revel
angle; B, ICnaniel wall; F, Dento-enamel junction; G, Dentinal wall; H, Base line angles.
The external enamel line is the entire outline of the cavity at
its enamel margin.
The cavo-surface angle is the angle formed by the junction of
the wall of the cavity with the external surface of the tooth.
The base of the cavo-surface angle is the external enamel surface.
The marginal bevel of a cavity is the deflection of a cavity wall
from its established plane, near the external enamel line.
It is necessary that beveling be resorted to, in order to manage
CAVITY NOMENCLATURE 27
the axial, labial and lingual walls in proximal cavities in the six
anterior teeth is, for convenience, named the "incisal angle."
A simple cavity has two sets of line angles. First, the internal
line angles surrounding the internal Avail, which is the axial wall
in axial surface cavities, and the pulpal wall in occlusal cavities.
The second set of external line angles is formed by the junc-
tion of the outside walls with each other.
The enamel margin is that point on the surface of the tooth
where the cavity begins in enamel.
;\\vsjc5^^^^v;^i,:^
I'"ig. 12. A, Kxternal enamel surface; B, Cavo-surface angle; C, Marginal bevel; D, Revel
angle; B, ICnaniel wall; F, Dento-enamel junction; G, Dentinal wall; H, Base line angles.
The external enamel line is the entire outline of the cavity at
its enamel margin.
The cavo-surface angle is the angle formed by the junction of
the wall of the cavity with the external surface of the tooth.
The base of the cavo-surface angle is the external enamel surface.
The marginal bevel of a cavity is the deflection of a cavity wall
from its established plane, near the external enamel line.
It is necessary that beveling be resorted to, in order to manage
