Article: PDF OnlyThe effect of temporal parameters on subjective sensations evoked by electrical tooth stimulationVirtanen, Antti S.J.a; Huopaniemi, Timoa,*; Närhi, Matti V.O.*; Pertovaara, Anttia; Wallgren, KariaAuthor Information aDepartment of Physiology, University of Helsinki, HelsinkiFinland bDepartment of Physiology, University of Kuopio, KuopioFinland *Correspondence to: Dr. Timo Huopaniemi, Department of Physiology, University of Helsinki, Siltavuorenpenger 20 J, 00170 Helsinki, Finland. (Received 10 November 1986; revised received accepted February and 18, 1987.( Pain: September 1987 - Volume 30 - Issue 3 - p 361-371 doi: 10.1016/0304-3959(87)90024-8 Buy Metrics Abstract The effect of stimulus duration and frequency on subjective sensations evoked by electrical tooth stimulation was studied in 12 subjects. The sensory responses were classified using 5 equi-sensation categories (perception threshold, prepain, pain threshold, moderate pain, intense pain). Both continuously increasing and randomised stimuli were applied. A comparison was made with the activation thresholds of intradental A- and C-fibres in the cat. The mean threshold of intradental A-fibres was lower than the perception threshold at all pulse durations. Perception threshold decreased with increasing stimulus frequency. Current intensities which evoked prepain at a stimulus frequency of 1 Hz were rated as pain at 20 Hz. At supraliminal pain levels the effects of summation were more marked. High-frequency stimulation produced intense pain sensations at intensities well below the activation thresholds of pulpal C-fibres in the cat. We conclude that both perception and pain thresholds and supraliminal pain are modified by temporal summation, and that activation of different pulpal fibre populations is not responsible for production of prepain and pain sensations. © Lippincott-Raven Publishers.