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Deactivation of the Jaw Depressor Reflex by Hot Water Applied to Dentin

A jaw opening reflex (Sherrington, JPhysiol Lond 51:404, 1917) can be elicited from teeth and gingiva, and the threshold for this reflex is approximately equivalent to pain thresholds (Dorman and Gage, Arch Oral Biol 23:505, 1978). Neural responses to stimulation of dentin give the impression that nerve fiber is not directly involved (Yamada et al., Neural Responses of Oral Tissues to Mechanical and Chemical Stimuli. In: OralFacial Sensory and Motor Mechanisms, Dubner and Kawamura, Eds., New York: Appleton-Crofts, 1971, p. 123), and mechanical stimulation of pulpal nerve elements has been suggested (Brannstrom and Astrom, J Dent Res 43:619, 1964). Osmotic forces may excite pulpal nerves and result in pain (Anderson, Arch Oral Biol 12:417, 1967), but this effect may fall off and be lost following continued application of the stimulus. Heating the teeth may result in pain (Hensel and Mann, Stoma 9:76, 1956), even when the pulp temperature rise is less than 10C. In order to study the effect of temperature and osmotic stress on the ability of electrical stimuli to elicit the jaw depressor reflex and hence produce pain, cavities were prepared in dog cuspid teeth and treated with hot water or hot isotonic saline. Deactivation of the jaw depressor reflex by hot water, but not by hot isotonic saline, is the subject of this report. Two opposed cavities situated buccolingually were prepared in cuspid teeth of anesthetized