A. Base line recording, prior to treatment. In this case the baseline bites amplitude approached the upper level of the device capacity.
B. Twenty-four hours following pulp exposure, there is a reduction in bite force amplitudes and frequencies.
C. Following administration of 5mg/kg of morphine s.c., bite force amplitude and frequency are restored to near-baseline values.
D. Following administration of 1mg/kg naloxone i.p., bite force amplitude and frequency are again reduced.