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Fig. 396.

Figs. 396, 397, 398. Outlines of forms of contact, occliiso-gingivally, between the second bicuspid
and the first molar. The t\|ies ;ire ^nod aa among the Ijicuspid ami molar teeth generally.
Figure 39(i is fairly good and safe, but is not so good as Figures 397 or 398. The last is the best
form, especially in the width of the interproximal space and the recurving of the lines of approach
to the contact point. Some recurve of the lines approaching the contact point should be made in finish-
ing proximal fillings in bicuspids and molars. The amount of recurve tbat can be made will obviously
vary greatly in different cases, for in some the teeth are bell-crowned, giving plenty of room in the
gingival portion of the interproximal space, while other teeth are so thick at the gingival line as to
give very little room. A good recurve to the gingival of the contact point, which is readily made with
the convex files, causes stringy foods that may be forccil past the contacts to become loose at once so
that they will be pulled away by tlie next crush of food passing the embrasures. This keeps the inter-
proximal spaces constantly cleaned.
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