Anesthesia Induced by Local Refrigeration of the Jaws

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Abstract
Temp. measurements were taken in dogs from areas of mandibles cooled by applicators through which a refrigerant at 0[degree] to 1[degree]C was circulated. The temps. varied from 11.5[degree] at the inferior alveolar nerve to 2.8[degree]C at the surface of the mucous membrane in contact with the applicator. His-tologic investigation of nerves from canine mandibles subjected to continuous local refrigeration at 0[degree] to 1[degree]C for 2-hr. periods did not disclose evidence of injury to either the inferior dental nerves, or to the nerves of the mucous membrane and periosteum. Fifty-two cavities were prepared for filling under local refrigeration at 1 [degree] to 2[degree]C in the teeth of 33 members of the naval service. In 34 instances (63%) completed anesthesia was obtained; in 13 instances (25%), very mild to moderate pain was experienced; and, in 5 (10%), there was little or no anesthesia.

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