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l82 MECHANICAL DENTISTRY AND METALLURGY.

Making the Cusps, or Occluding Surface.—A number of
methods have been put forward for making gold cusps.
The two that have proven most satisfactory are the use of
separate dies, and by means of the die plate. In the former
the gold plate is placed upon a piece of lead and the die
carefully driven into it, while in the latter method the plate
Fig. is6.

is laid over the die desired and the hub or small piece of
lead is driven down into the depression. This method is
shown in Figs. 155, 156 and 157.
Fig. 155 shows a section of the die plate with a piece of
gold plate over the upper right first molar, and the lead hub
ready to be driven home. Fig. 156 shows the appearance
FfG. 157.

after driving the lead, while in Fig. 157 we have the appear-
ance of the cusps swaged into the gold as well as the lead
after they are removed from the die plate.
Reinforcing the Cusps.—After securing a well-defined