TABLE 3.

Electrode impedances measured between the stimulating electrode and common ground for canal studied on three longitudinal time periods: pre-injection, unilaterally lesioned, and bilaterally lesioned

Canal	Pre	Uni	Bi
M1—lateral	13.93	14.6	14.25
M1—posterior	33.38	36.04	32.66
M2—lateral	19.21	16.95	16.96
M4—posterior	29.06	32.3	30.21
M3—lateral	15.24	14.88	13.92
M3—posterior	19.31	19.31	19.39

Pre pre-injection, Uni unilaterally lesioned, Bi bilaterally lesioned