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PORCELAIN INLAYS 169
of the tooth, so that a step is produced that will
effectually prevent the inlay from being tipped
out by the force of mastication. When it comes,
however, to this, the thickness of the cutting edge
restoration must be considered. The breaking
strain that the porcelain is likely to be subjected
to must be observed, and the propriety of an inlay,
a gold restoration, or a crown determined on, as the
judgment of the operator dictates.
Whenever the cutting-edge corner of an ap-
proximal cavity in an incisor or cuspid has to be
restored, it is claimed that the porcelain cores
invented by Mr. W. F. Mellersh not only effect
considerable saving of time, but greatly facilitate
and improve the operation. In the Journal of the
British Dental Association, July 1902, Mr. Mellersh
writes :
" After investing, the floor of the matrix should
have sufficient body baked into it to fill the deeper
.
portion, but not to show any contour. Over this a
quite fluid mix of body and alcohol is laid, and the
porcelain tip wetted with a little of the same by
being rubbed over the palette with a pair of con-
veying forceps. The tip is set gently in place in
the matrix, care being taken to ensure that its edge
is square with the cutting-edge of the tooth—as
shown by the impression in the foil—and that its
PORCELAIN INLAYS 169
of the tooth, so that a step is produced that will
effectually prevent the inlay from being tipped
out by the force of mastication. When it comes,
however, to this, the thickness of the cutting edge
restoration must be considered. The breaking
strain that the porcelain is likely to be subjected
to must be observed, and the propriety of an inlay,
a gold restoration, or a crown determined on, as the
judgment of the operator dictates.
Whenever the cutting-edge corner of an ap-
proximal cavity in an incisor or cuspid has to be
restored, it is claimed that the porcelain cores
invented by Mr. W. F. Mellersh not only effect
considerable saving of time, but greatly facilitate
and improve the operation. In the Journal of the
British Dental Association, July 1902, Mr. Mellersh
writes :
" After investing, the floor of the matrix should
have sufficient body baked into it to fill the deeper
.
portion, but not to show any contour. Over this a
quite fluid mix of body and alcohol is laid, and the
porcelain tip wetted with a little of the same by
being rubbed over the palette with a pair of con-
veying forceps. The tip is set gently in place in
the matrix, care being taken to ensure that its edge
is square with the cutting-edge of the tooth—as
shown by the impression in the foil—and that its
