Page 195 - My FlipBook

CROWN- AND l!Rll)(U=:-\VORK. I<^3

occluding surface or canico fur the case in hand, it should
be filled with gold plate scraps or solder of a lower carat,
with a little borax. This is all held over a Bunsen burner
until the small pieces of gold come to the fusing point and
settle down into the depressions of the shell. Alore small
pieces should then be added until it is level full. The sur-
plus gold should then be trimmed away, and a file passed
several times over the surface of the solder to bring it down
perfectly level and smooth. This is all illustrated in Fig.
158.
Before removing the band from its position in the riiouth,
a small mark should be made with an excavator to indicate
the center of the buccal surface, which will serve as a guide

Fig. 1^8.

for the correct placement of the cusps. By giving the band
and the cusps a smooth surface with a fine file, as has been
directed, it will be found that an accurate joint between
them can readily be secured.
Adjusting and Soldering.—Having carefully noted the
line of occlusion and marked the band to indicate the point
whei;e the center of the buccal surface of the cusps or crown-
plate should be placed and soldered, the two—the band and
the crown-plate—should be carefully brought together and
secured with a few strands of small binding wire. The
joint should now be coated with borax dissolved in water,
when it ready for the final soldering. If solder has been
used in filling the cusps, no additional solder will be needed
at this time, as by simply holding the crown over the flame
of a Bunsen burner, as shown in Fig. 159, until the solder
is seen to come to the fusing point (when it should be in-