Figure 1. Examples of pulpal blood flow (PBF) recordings in control vs. stimulated tooth. (A) Example of recording curves (15-minute sweeps) when bipolar electrical stimulation (10 sec, 50 µA, 2 ms, 20 Hz) was performed on 1 rat mandibular incisor. PBF changes of stimulated tooth (top), PBF of contralateral incisor that was monitored as control (second), and differential PBF, which we calculated by subtracting the values measured on control tooth from those measured on the stimulated tooth (third), are shown. Mean arterial blood pressure (BP) was monitored in parallel (bottom). Values are expressed in percentages of baseline levels. (B) Example of PBF monitoring (15-minute sweeps) on both mandibular incisors of 1 animal during intravenous injection of an EAA receptor antagonist (here MPPG, 0.15 mg/kg); differential PBF evolution is also shown.