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MAKING AND SETTING OF A GOLD INLAY 117
With these lingual restorations, the amount of surface covered is
generally quite large as compared to the thickness of the restoration
which is best termed an ' ' onlay. '
This method simplifies angle restoration in Class Four plan one
and provides ample resistance form, -without the cutting of either
the incisal or lingual step. In such cases the alignment of the pin
must be perfect else the inlay will not go to proper place. The
soldering of the pin to a gold matrix gives the desired security during
the processes of removing and investment. The cavity preparation
is the same as for cohesive gold except the convenience angles.
The pin is fitted to a portion of the root canal as previously given.
A sheet of pure gold, 32 to 34 gauge is selected of sufficient size to
more than cover the cavity by about two millimeters. This is par-
tially burnished to the cavity, enough to shoAV the cavity outline
in the gold. A hole is punched in the proper position to receive the
pin, but smaller than the pin, which should be 15 or 16 gauge. In
case the inlay is to be used as an abutment for a bridge, the pin had
better be as large as 14 gauge, if platinized gold is used. When
tungsten is used, 16 gauge is ample.
The operator should then place the matrix in position and croAvd
the pin through the hole to place ; then scribe the pin just external
to the gold matrix, remove and solder as nearly in correct position
as possible, without stopping to invest, using 22K solder.
Only a very small amount of solder will be needed or should be
used, care being taken that it is all flowed close to the pin to pre-
vent stiffening the matrix. All should then be returned to the
cavity and the gold reburnished to a perfect fit of the entire cavity
outline.
It is necessary to burnish the gold only partially into the deep
recesses of the cavity as the pin, if of iridio-platinum or tungsten,
will be sufficient anchorage. This can be made to equal that fre-
quently relied on for an entire croAvn. This pattern must move to
the incisal for exit and if the matrix is burnished to contact with
the axial Avail it Avill become fixed. The matrix should be bur-
nished to a complete fit of the gingival Avail Avhich should be flat
and Avell squared into the lal)ial and lingual angles.
Making the Wax Contour. The matrix and attached pin are re-
moved, and the desired contour built up by floAving the Avax to
position Avith a spatula, trying the Avhole pattern to place in the
cavity to guide in the restoration. When complete, the Avax is
chilled and removed and all is readv for investment.
MAKING AND SETTING OF A GOLD INLAY 117
With these lingual restorations, the amount of surface covered is
generally quite large as compared to the thickness of the restoration
which is best termed an ' ' onlay. '
This method simplifies angle restoration in Class Four plan one
and provides ample resistance form, -without the cutting of either
the incisal or lingual step. In such cases the alignment of the pin
must be perfect else the inlay will not go to proper place. The
soldering of the pin to a gold matrix gives the desired security during
the processes of removing and investment. The cavity preparation
is the same as for cohesive gold except the convenience angles.
The pin is fitted to a portion of the root canal as previously given.
A sheet of pure gold, 32 to 34 gauge is selected of sufficient size to
more than cover the cavity by about two millimeters. This is par-
tially burnished to the cavity, enough to shoAV the cavity outline
in the gold. A hole is punched in the proper position to receive the
pin, but smaller than the pin, which should be 15 or 16 gauge. In
case the inlay is to be used as an abutment for a bridge, the pin had
better be as large as 14 gauge, if platinized gold is used. When
tungsten is used, 16 gauge is ample.
The operator should then place the matrix in position and croAvd
the pin through the hole to place ; then scribe the pin just external
to the gold matrix, remove and solder as nearly in correct position
as possible, without stopping to invest, using 22K solder.
Only a very small amount of solder will be needed or should be
used, care being taken that it is all flowed close to the pin to pre-
vent stiffening the matrix. All should then be returned to the
cavity and the gold reburnished to a perfect fit of the entire cavity
outline.
It is necessary to burnish the gold only partially into the deep
recesses of the cavity as the pin, if of iridio-platinum or tungsten,
will be sufficient anchorage. This can be made to equal that fre-
quently relied on for an entire croAvn. This pattern must move to
the incisal for exit and if the matrix is burnished to contact with
the axial Avail it Avill become fixed. The matrix should be bur-
nished to a complete fit of the gingival Avail Avhich should be flat
and Avell squared into the lal)ial and lingual angles.
Making the Wax Contour. The matrix and attached pin are re-
moved, and the desired contour built up by floAving the Avax to
position Avith a spatula, trying the Avhole pattern to place in the
cavity to guide in the restoration. When complete, the Avax is
chilled and removed and all is readv for investment.
