The subjects were a total of 40 subjects (students of Hiroshima university school of dentistry), of which 20 were males and 20 were females.
Changes in internal behavior were observed when the subjects were stimulated by dental pain which consisted of slow and sudden electric stimulus to the pulp and physical stimulus to the skin or oral mucous membrane.
The change ratios between the rest and the stimulated situations were analyzed with respect to the electrocardiogram (ECG), the respiration curve (RC), the plethysmogram (PL) and the electrooculogram (EOG).
The change ratios of resistance in stimulus were analyzed with respect to the galvanic skin refrex (GSR).
The internal changes to the dentaly painful stimuli were compared with the stimulus difference, index difference and sex difference.
1) There was no significant difference between each stimulus on the ECG, PL and EOG. However, the electric stimuli showed larger change ratios than the physical stimuli on the RC and GSR. The sudden electric stimuli showed larger change ratios than the slow electric stimuli on the GSR.
2) The total ratios of change in the index for the 7 types of stimulus decreased in the order, index-wise, EOG (152.65%) >PL (41.68%) >RC (33.64%)>GSR (12.85%) >ECG (6.53%). However, after the total ratios were standardized, there was no significant difference on each index. The variable coefficient increased in the following order, PL (0.50) <GSR (0.80) <ECG (0.84)<RC (0.88) <EOG (1.19).
3) Comparing sex groups, there was some significant difference on the RC and GSR, but there was no significant difference on the ECG, PL and EOG.