The Effect of Extracellular Calcium on Thermal Excitability of the Sensory Units in the Tooth of the Cat

摘要: Intradental sensory nerve impulse activity was measured from dentinal cavities in canine teeth of anesthetized cats. No spontaneous usually recorded filled with isotonic saline. Heat stimulation 15–20oC failed to give any activity, while other stimuli, such as air blasts produced bursts impulses. Lowering extracellular calcium ion concentration. by local application sodium citrate, oxalate or EDTA, induced activity. Under these conditions, heat a rapid increase discharge which lasted long the stimulus applied. Increased concentration abolished this response heat. The present findings show that change modulates excitability intradental units, and may thus also modulate resulting experience pain.