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50 OPERATIVE DENTISTRY

Convenience Form. No convenience form is usually necessary
in small cavities Class One, except in rare instances it may be of
advantage to sharpen one of the distant point angles to facilitate
the starting of a cohesive gold filling. But usually the first por-
tion of gold may be used of sufficient size to entirely cover the
pulpal wall, in which case it can be securely locked to position be-
tAveen the surrounding walls.
Removal of Remaining Decay. By this time the carious dentine

Fig. 17.—Complex Class One cavity prepared.

will usually have been removed. Should any remain it should be
excavated with suitable spoons.
At this point there should be a thorough inspection of the dento-
enamel junction for small areas of softened dentine which may
have escaped notice.
The Walls should all be flat, particularly the pulpal. In cases
where decay has progressed so deeply into the dentine that to flat-
ten the pulpal wall would cause the involvement of the recessional
tracts of the horns of the pulp, the base-line angle should be made
intermittent, omitting the squaring of the angles in the regions of
the recessional tracts.
Disinfection. The cavity should be flooded with alcohol carry-
ing a small per cent of formaldehyde, say one or one-half per cent,
and evaporated to dryness.
Finish of Enamel Walls. The enamel wall should be planed for