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CLASSIFICATION OF FILLING MATERIALS 1 45
to an exalted degree sensations of heat, cold and electricity,
when present in the mouth, to the pulp. The pulp rebels on
reception of these sensations, responding in the form of a
paroxysm of pain. This being the case, the ideal filling
material should be a non-conductor, so that when placed,
these sensations may not be transmitted through its
substance.
7. Capability of Polish.—The highly polished condition of
the enamel prevents, to quite an extent, the accumulation of
food on its surface. Filling materials should be capable of
taking a high degree of polish for the same reason.
8. Convenience of Manipulation.—Filling materials should
be easily and conveniently manipulated, so that the operation
may be completed quickly, and with as little strain as possible
on patient and operator.
Classification of Filling Materials
The materials to be considered are Gold, Amalgam, Ce-
ment, Tin, Gutta-percha. None of these fill all of the above
requirements, hence the ideal filling material has not yet been
discovered. Gold, Amalgam and Tin may be considered as
Permanent filling materials, as they have sufficient lasting
qualities to be classed in that category, while Cement and
Gutta-percha, owing to their short period of usefulness, are
classed as Temporary filling materials. Another classification
of filling materials is into Plastic and Non-plastic. The
Plastics include Amalgam, Cement and Gutta-percha, these
materials being worked while in a soft or plastic state,
and hardening after being placed in position; the Non-
plastics including Gold and Tin, which do not possess this
quality.
10
to an exalted degree sensations of heat, cold and electricity,
when present in the mouth, to the pulp. The pulp rebels on
reception of these sensations, responding in the form of a
paroxysm of pain. This being the case, the ideal filling
material should be a non-conductor, so that when placed,
these sensations may not be transmitted through its
substance.
7. Capability of Polish.—The highly polished condition of
the enamel prevents, to quite an extent, the accumulation of
food on its surface. Filling materials should be capable of
taking a high degree of polish for the same reason.
8. Convenience of Manipulation.—Filling materials should
be easily and conveniently manipulated, so that the operation
may be completed quickly, and with as little strain as possible
on patient and operator.
Classification of Filling Materials
The materials to be considered are Gold, Amalgam, Ce-
ment, Tin, Gutta-percha. None of these fill all of the above
requirements, hence the ideal filling material has not yet been
discovered. Gold, Amalgam and Tin may be considered as
Permanent filling materials, as they have sufficient lasting
qualities to be classed in that category, while Cement and
Gutta-percha, owing to their short period of usefulness, are
classed as Temporary filling materials. Another classification
of filling materials is into Plastic and Non-plastic. The
Plastics include Amalgam, Cement and Gutta-percha, these
materials being worked while in a soft or plastic state,
and hardening after being placed in position; the Non-
plastics including Gold and Tin, which do not possess this
quality.
10
