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CAVITY PREPARATION FOR GOLD INLAYS 99
In cases where this has not been done, or the cavity is naturally
retentive, the retention should be temporarily covered, as Avill later
be described, Avhile making the model.
Change of Position of Retention Angles. It is quite ideal to cut
just as heavy retention angles in the different classes of cavities
for gold inlays, as for cohesive gold, only they should be laid in a
different position and cut at the expense of the base walls rather
than the surrounding \^'alls, in order to give the cavity draw.
This feature of the cavity preparation will be described as we con-
sider the preparation of cavities by classes farther on in this
chapter.
The Order of Procedure for Inlays aa ould then be as follows
1. Gain access.
2. Outline form.
3. Resistance form.
4. Convenience form.
5. Removal of remaining decay,
6. Finishing enamel walls.
7. Toilet of the cavity.
8. Retention form, which is given as the fourth order in other
forms of fillings.
Gaining Access for inla.y filling is the same as that with other
fillings as far as surgical procedure is concerned. No more tooth
substance should be cut aAvay on this account.
When using preliminary separation for access, there should be
in most of Classes Two or Three cavities, more room secured, as
this will materially assist in getting a correct wax pattern as well
as aid in the process of placing the inlay.
Resistance Form for Inlays should receive the same careful con-
sideration as given for other fillings. Weakened enamel walls
should be protected not only from th-e subsequent force received
in stress but from the stress of setting the inlay. Flat seats for all
inlays are imperative. The usual steps in Classes Two and Four
are called for as an important factor in retention to resist the tip-
ping strain.
Convenience Form for Inlays should not be practiced to excess.
No convenience points are required. The major portion of con-
venience form should be gained through separation, preferably
slow separation.
Removal of Remaining Decay. When it has been fully deter-
mined that the pulp is not to be removed, some decay may be left on
the axial wall, or in the region of the bucco-axial or the linguo-
CAVITY PREPARATION FOR GOLD INLAYS 99
In cases where this has not been done, or the cavity is naturally
retentive, the retention should be temporarily covered, as Avill later
be described, Avhile making the model.
Change of Position of Retention Angles. It is quite ideal to cut
just as heavy retention angles in the different classes of cavities
for gold inlays, as for cohesive gold, only they should be laid in a
different position and cut at the expense of the base walls rather
than the surrounding \^'alls, in order to give the cavity draw.
This feature of the cavity preparation will be described as we con-
sider the preparation of cavities by classes farther on in this
chapter.
The Order of Procedure for Inlays aa ould then be as follows
1. Gain access.
2. Outline form.
3. Resistance form.
4. Convenience form.
5. Removal of remaining decay,
6. Finishing enamel walls.
7. Toilet of the cavity.
8. Retention form, which is given as the fourth order in other
forms of fillings.
Gaining Access for inla.y filling is the same as that with other
fillings as far as surgical procedure is concerned. No more tooth
substance should be cut aAvay on this account.
When using preliminary separation for access, there should be
in most of Classes Two or Three cavities, more room secured, as
this will materially assist in getting a correct wax pattern as well
as aid in the process of placing the inlay.
Resistance Form for Inlays should receive the same careful con-
sideration as given for other fillings. Weakened enamel walls
should be protected not only from th-e subsequent force received
in stress but from the stress of setting the inlay. Flat seats for all
inlays are imperative. The usual steps in Classes Two and Four
are called for as an important factor in retention to resist the tip-
ping strain.
Convenience Form for Inlays should not be practiced to excess.
No convenience points are required. The major portion of con-
venience form should be gained through separation, preferably
slow separation.
Removal of Remaining Decay. When it has been fully deter-
mined that the pulp is not to be removed, some decay may be left on
the axial wall, or in the region of the bucco-axial or the linguo-
