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1
FILLING TEETH i 1
It is usually prepared in the foi'm of foil, and used
on the non-cohesive principle. Cohesive fillings
have been made with tin, by using small shavings
freshly cut from a block of tin at the time of the
operation. It is also possible to make a cohesive
tilling with tinfoil, but this takes up far more
time than working cohesive gold. For all practical
purposes tin will be considered a non-cohesive
material, and manipulated as such. It is softer
than gold, and more easily manipulated and adapted
to cavity walls. It is a low conductor of heat, and
is therefore tolerated in closer proximity to a pulp
than gold or any other metal used for filling teeth.
Its value as a filling material per sc is more than
counterbalanced by its defects. It becomes dis-
coloured and dark on the surface, and is not so
resistant to the force of mastication as non-cohesive
gold. The writer has found that tin fillings rot or
disintegrate at the cervical margins of bicuspids and
molars. This has frequently happened, no matter
if the filling was entirely made of tin, whether
it was used up to the knuckle and the operation
completed with gold, or whether tin and gold were
rolled up together in equal quantities, and used as
recommended by the late Dr. Abbott and others.
This rotting did not take place in every case, but
occurred sufficiently often to compel the writer to
FILLING TEETH i 1
It is usually prepared in the foi'm of foil, and used
on the non-cohesive principle. Cohesive fillings
have been made with tin, by using small shavings
freshly cut from a block of tin at the time of the
operation. It is also possible to make a cohesive
tilling with tinfoil, but this takes up far more
time than working cohesive gold. For all practical
purposes tin will be considered a non-cohesive
material, and manipulated as such. It is softer
than gold, and more easily manipulated and adapted
to cavity walls. It is a low conductor of heat, and
is therefore tolerated in closer proximity to a pulp
than gold or any other metal used for filling teeth.
Its value as a filling material per sc is more than
counterbalanced by its defects. It becomes dis-
coloured and dark on the surface, and is not so
resistant to the force of mastication as non-cohesive
gold. The writer has found that tin fillings rot or
disintegrate at the cervical margins of bicuspids and
molars. This has frequently happened, no matter
if the filling was entirely made of tin, whether
it was used up to the knuckle and the operation
completed with gold, or whether tin and gold were
rolled up together in equal quantities, and used as
recommended by the late Dr. Abbott and others.
This rotting did not take place in every case, but
occurred sufficiently often to compel the writer to
