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FILLING BY CLASSES AND MODIFICATIONS. . 211

mending that they be larger at the palatine part
than at the labial; others, that they be larger at the
points than at the necks of the teeth; some, that a
shoulder be left at the necks; and others, that there
be no shoulder at all. In making these separations,
however, the operator must be governed somewhat

by circumstances, no general rule being applicable to
all cases. The form of the teeth and the extent of
the decay, together w ith the character of the remain-
T
ing enamel and dentine, will modify the form of the
space, between them. If the inner wall is thin or
broken away,—and it is usually more friable and
more broken than the labial wall,—it should be cut

off more than the outer; in which case the palatine
portion of the separation will be the largest—as, in-
deed, some prefer to make it in all cases, performing
the remainder of the operation from the inside. Almost
every operation upon these teeth will require attention
and manipulation, in every step, from both the pala-
tine and labial sides, in order to make secure every
point. The precise mode of procedure nlust be de-
termined by the case to which it is to be applied.

The most direct approach is always to be employed
when practicable.
In some cases separation will be larger at the points
of the teeth than elsewhere; as, where there has boon
a partial fracture at the points. In cutting away to