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CHAPTER VI

FILLING MATERIALS

Filling.—A material so placed in the prepared cavity of a
tooth that the physiological and mechanical functions of the

organ, its anatomical form, occlusion, contact point and
esthetic appearance are properly restored or preserved, and
the cavity itself protected as far as possible from future
decay.
Attributes of an Ideal Filling Material.

1. Insolubility,
2. Harmonious color,
3. Adaptability to cavity walls,
4. Crushing resistance,
5. Freedom from molecular change,

6. Non-conductivity,
7. Capability of polish,
8. Convenience of manipulation.

1. Insolubility.—The mouth frequently contains, in addi-
tion to the watery constituents of the saliva, chemical sub-
stances, such as acids, which have a tendency to unite with
and dissolve certain metals or their salts, as well as tooth
structure; hence the necessity for the selection of a filling
material which will resist the action, not only of water, but

also of these chemicals.
2. Harmonious Color.—People of refinement and culture
demand the use of a filling material which, where exposed
to view, is harmonious in color, or at least presents a pleasing

contrast to natural tooth structure, being as slightly con-
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