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110 OPERATIVE DKNTISTRY
The Occlusal Wall. The axio-occlusal angle should be slightly
obtuse, Avhile the axio-niesial and distal angles may be nearly a
right angle. This will permit the model to tip to the buccal in
exit, though the gingivo-axial ang]e be acute.
Preparation of Cavities of Class Six.
The restoration of abraded surfaces with the gold inlay is good
practice, inasmuch as it is possible to effectually protect these
Fig. 70.—Class Five cavity and inlay.
l.'jg. 71.—Showing the necessary amount of metal for adequate protection of ahraded surfaces,
when opening the bite.
surfaces from further destruction with the minimum amount of
cutting. As is the case with the other forms of filling the surface
