Page 240 - My FlipBook

208 THE GOLD AND PORCELAIN INLAY

with a fine brush before fusing. All excess porcelain should

also be removed from the margins, with a brush, before fusing.
The baking should be continued until proper contours are
restored, trying in the mouth as often as is necessary to
accomplish the result. After the final fusing, try the inlay
in the mouth, and before removing the matrix, grind to the
proper contour and occlusion with a fine stone. Now care-

fully remove the matrix. This is accomplished by dropping
the inlay and matrix in alcohol or water, then carefully peeling
the matrix away, first from the margin and later from the
body, to prevent chipping of the margins.
The under surface of the inlay should now be etched to

provide for better retention. Imbed the contour surface
of the inlay in wax, and seal the margins with a hot spatula
to prevent contact of acid with the margins. Dip a sharp
wood stick into the wax bottle containing hydrofluoric acid
and paint the exposed side of the inlay with the acid for 2 or
3 minutes, thus etching or roughening the inlay, to provide

for a better grasp of the cement. Then flood with water,
remove the wax, wash with boiling water followed by chloro-
form, then dry, when the inlay is now ready to set.
After thoroughly drying the cavity and inlay, cover the

walls of the cavity and the under surface of the inlay with a
good, white, sticky cement, mixed to a creamy consistency.
Press the inlay firmly to place with an orange wood stick,
tapping untfl firmly seated, when it should be held or wedged
to place until the cement is set. Finish down at a subsequent
sitting, removing excess cement, dressing down over-hanging

margins, and polishing with fine stones and discs.