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To determine the effects of applying KCl solutions to exposed dentine at atmospheric pressure on pain evoked by probing and air blast stimuli in human subjects.The experiments were carried out on 24 premolars in 16 subjects (aged 16–30 years). A cavity (diameter 3mm, depth 3mm) was cut at the tip of the buccal cusp and etched with 35% orthophosphoric acid. The cavity was filled with 500, 250mmol/l...