Page 52 - My FlipBook

36 THE TIGHTENING OF LOOSE TEETH

a third solution, consisting of 100 grms. of phosphate
of soda dissolved in 700 grms. of distilled water.
Boil the whole until the precipitate disappears, and
on stirring there is no ammoniacal smell. Replace
the evaporated water, and boil the mixture down to
about Ih litres.
For platinizing heating is required, but satisfactory
results may also be obtained at a lukewarm tempera-
ture. A point of importance is that those parts of
the bridge which are not to be platinized ought to be
covered with sticking-wax. By means of this method,
the most complicated saddle-bridge can be made in
half the time that would be required for swaging a
platinum saddle. Within ten minutes the parts are
covered with an absolutely dense and beautiful coating
of platinum.
If the processus alveolaris be badly absorbed, it may
be sometimes better practice to substitute an extension
bridge of the saddle-bridge kind,
A very strong wire splint is laid horizontally from
one abutment to the other, and very heavily sol-
dered.
The tube teeth are placed on the splint with regard
to the articulation, and the pins marked through the
tubes of the teeth. Bowel crowns are pressed into
the wax to mark the pins. The lower margins of the
teeth extend to the splint, in order that the tongue
be not irritated (see Fig. 26).
Extension bridges with very divergent abutments
should be adjusted with caps which will not project