Abstract
Stewart (5) determined the touch thresholds of incisors in human subjects and found that the thresholds of the few pulpless teeth he examined did not differ significantly from those of the vital teeth. On the other hand, Loewenstein and Rathkamp (3) found that the thresholds for pulpless teeth were 57% higher than those of vital teeth, and on the basis of their results concluded that there were low threshold mechanoreceptors in teeth which contributed to the sensation of touch. There is, however, no other evidence for low threshold intradental mechanoreceptors, and it has generally been assumed that touch sensation from teeth depends only on the mechanoreceptors in the periodontal tissues (1). The present experiments were carried out to make further measurements of the touch thresholds of vital and nonvital teeth.
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