Page 271 - My FlipBook
P. 271
:
EXCAVATION OF CAVITIES BY CLASSES. 117
EXCAVATION OF CAVITIES BY CLASSES.
Note. The determination of the conditions calling for filling
operations is dependent upon pathological processes presented
in Volume I. As it is the intention to confine this volume as
strictly as possible to the technical procedures of filling opera-
tions, the pathological processes will not be discussed. Here
our principal attention must be given to the physical conditions
presented by individual teeth with only brief references to the
pathology and principles on which the treatment is based. Brief
restatements of pathological conditions will, however, be fre-
quently made.
As previously stated, cavities are divided into five groups
or classes, in each of which the cavities require similar treatment
and instrumentation, as follows
Class 1. Cavities beginning in structural defects in the
teeth, pits and fissures.
Class 2. Cavities in the proximal surfaces of the bicuspids
and molars.
Class 3. Cavities in the proximal surfaces of the incisors
and cuspids which do not involve the removal and restoration
of the incisal angle.
Class 4. Cavities in the proximal surfaces of the incisors
which do require the I'emoval and restoration of the incisal angle.
Class 5. Cavities in the gingival third — not pit cavities —
of the laljial, buccal or lingual surfaces of the teeth.
A definite order of procedure, which should be followed in
cavity preparation, has been given. This consists of obtaining
outline form, resistance form, retention form, convenience form,
the removal of remaining carious dentin, the finishing of the
enamel wall and the toilet of the cavity. Generally, each of these
should be considered in the order mentioned, but in the actual
preparation of many cavities it will be impossible to definitely
separate each of these procedures from the others. For example,
resistance and retention form will practically always be obtained
by the same instruments and at the same time ; and in the smaller
cavities, all of the carious dentin may be removed incidentally
in securing resistance and retention form. Each of these pro-
cedures should, however, be in the mind of the operator in the
preparation of each cavity.
EXCAVATION OF CAVITIES BY CLASSES. 117
EXCAVATION OF CAVITIES BY CLASSES.
Note. The determination of the conditions calling for filling
operations is dependent upon pathological processes presented
in Volume I. As it is the intention to confine this volume as
strictly as possible to the technical procedures of filling opera-
tions, the pathological processes will not be discussed. Here
our principal attention must be given to the physical conditions
presented by individual teeth with only brief references to the
pathology and principles on which the treatment is based. Brief
restatements of pathological conditions will, however, be fre-
quently made.
As previously stated, cavities are divided into five groups
or classes, in each of which the cavities require similar treatment
and instrumentation, as follows
Class 1. Cavities beginning in structural defects in the
teeth, pits and fissures.
Class 2. Cavities in the proximal surfaces of the bicuspids
and molars.
Class 3. Cavities in the proximal surfaces of the incisors
and cuspids which do not involve the removal and restoration
of the incisal angle.
Class 4. Cavities in the proximal surfaces of the incisors
which do require the I'emoval and restoration of the incisal angle.
Class 5. Cavities in the gingival third — not pit cavities —
of the laljial, buccal or lingual surfaces of the teeth.
A definite order of procedure, which should be followed in
cavity preparation, has been given. This consists of obtaining
outline form, resistance form, retention form, convenience form,
the removal of remaining carious dentin, the finishing of the
enamel wall and the toilet of the cavity. Generally, each of these
should be considered in the order mentioned, but in the actual
preparation of many cavities it will be impossible to definitely
separate each of these procedures from the others. For example,
resistance and retention form will practically always be obtained
by the same instruments and at the same time ; and in the smaller
cavities, all of the carious dentin may be removed incidentally
in securing resistance and retention form. Each of these pro-
cedures should, however, be in the mind of the operator in the
preparation of each cavity.
