Histological analysis of cleaning capacity in apical third of flattened root canals with passive ultrasonic irrigation

Resumo

The aim of this study was to evaluate
histologically the passive use of ultrasound for cleaning the apical
portion of flattened root canal systems. Material and methods:
The sample consisted of 20 extracted human mandibular incisors
which were divided into two groups after being prepared with the
rotary system Hero 642 up to size #45 surgical diameter: Group
A – final irrigation with 4 ml of 2.5% sodium hypochlorite by
the conventional technique using a syringe, and Group B – final
irrigation with 4 ml of 2.5%, sodium hypochlorite divided into 1 ml
amounts which were activated with the passive use of ultrasound
for 15 seconds each time, generating a total activation period of 1
minute. Following, the teeth were subjected to morphometric analysis
to evaluate the cleaning ability promoted in both groups. Results
and Conclusion: Statistical analysis showed significant difference
(p < 0.05) between the groups, with the passive ultrasonic irrigation
resulting in cleaner canals.