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280 OPERATIVE DENTISTRY
Suprarenin is added to contract the capillaries and prevent ab-
sorption and infiltration into the tissues beyond the field of opera-
tion, thereby increasing the duration and strength of the anesthesia.
It is also added in certain cases to decrease the flow of blood.
m
Fig. 149.—Third position for the mandibular injection.
Dosage of Suprarenin. Differing from the amount of novocain
used the suprarenin should be varied for individual cases. In fact
it has probably been the practice of surgeons to use too strong a
solution of suprarenin in their local injections.
Preparing the Solution. In a dissolving cup, place a tablet of
