Page 16 - My FlipBook

12 THE TECHNICAL PROCEDURES IN FILLING TEETH.

In a mesio- or disto-occlusal cavity in a molar or bicuspid in
which the pulp is removed, the pulpal and axial walls are
removed. The floor of the pulp chamber becomes the sub-
pulpal wall of the cavity. This is usually distinct from the
gingival wall, because it is on a different level. Therefore, a
mesio- or disto-occlusal cavity in a molar or bicuspid with pulp
removed has —
A buccal wall,
A lingual wall,
A gingival wall,
A distal (or mesial) wall.
And —
A sub-pulpal wall.
Also some portions of the mesial (or distal) wall of the pulp
chamber will remain next to the gingival wall as a mesial (or
distal) wall. In a bicuspid or molar with a single broad pulp
canal the pulp chamber has no floor, and of course there will be
no sub-pulpal wall.
Proximate cavities in the incisors and cuspids, on account of
the wedge-like or triangular form of these surfaces, have but
three surrounding walls —
A labial wall,
A lingual wall,
A gingival wall,
And —

An axial wall.
When in incisor or cuspid proximate cavities the incisal angle
becomes involved so that its removal is required, a complex
cavity is formed by cutting an incisal step. There is in this case
no change in the naming of the walls of the proximate portion
of the cavity, as no one of the walls named has been completely
removed. But the step portion will have —
A lingual wall,
A labial wall,
A mesial (or a distal) wall.
And —
A pulpal wall.
Labial and lingual cavities in the incisors and cuspids have —
A mesial wall,
A distal wall,