All techniques
and instruments tested were able to reduce
significantly the number of bacterial cells in the
root canal. Instrumentation to a Nitiflex #30 was
significantly more effective than GT files. There
were no significant differences when comparing
the effects of the Profile instrument #5 with either
the GT files or the Nitiflex #30. Enlargement to a
Nitiflex #40 was significantly more effective in eliminating
bacteria when compared with the other
techniques and instruments tested (p < 0.05). The
results of this study showed that the instrumentation
and irrigation can mechanically remove more
than 90% of bacterial cells from the root canal.