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30 OPERATIVE DENTISTRY
Modification of Form is necessary in cavity preparation to meet
the various properties of the different filling materials used. This
is particularly true when considering the difference in edge strength
and flow 'of metals and alloys.
The character of the oral fluids, the evident care bestowed upon
the teeth, condition of patient's health, age of patient and the life
expectancy of the patient and of the individual teeth, will fre-
quently require a modification of cavity formation to best resist
the recurrence of decay and the dislodgement of the filling through
stress.
