Page 57 - My FlipBook

FILLING TEETH 41
is strongly objected to in the British Isles, and for this
reason—as well as for the reason that it is impossible
to prepare many posterior cavities in such a manner
that a mallet can be used—hand pressure has to be
greatly resorted to. It is almost if not quite impos-
sible to produce perfect adaptation with cohesive or
semi-cohesive gold and hand pressure, consequently
both the instruments and the gold should lend
themselves to the production of the greatest possible
adaptation and condensation. The plugger points
should be as fine as practicable, and the pieces of
gold should be small, and in working against the
walls they should only be sufficiently annealed to
enable the work to proceed satisfactorily.
In dealing with mallet Avork we are confronted
with several problems which, although easy of solu-
tion, have not yet been solved. This is doubtless
due to the great amount of work that would have
to be undertaken by several men before accurate
conclusions could be arrived at. So much depends
on an individual's skill and method of manipula-
tion that a comparison of similar experiments
carried out by a number of operators is needful.
The condensation and adaptation of cohesive gold
depends on accurately applied force. What we
want to know is the exact relationship that the
force of the blow, the size of the plugger point, and