Evaluation of apically extruded debris during endodontic retreatment

Resumo

A growing interest to preserve teeth into the mouth by
patients resulted in the increasing number of endodontic retreatments,
and when these happen, many different types of irritants are
extruded through the foramen. Objective: This study analyzed in
vitro the amount of debris extruded through the foramen using
four instrumentation techniques during endodontic retreatment.
Material and methods: Forty mesial-buccal roots of first molars
were selected, instrumented with anatomical diameter up to size #30
ISO file and then obturated with gutta-percha and grossman sealer
by lateral condensation. After, they were separated and randomly
allocated into four groups with 10 teeth each for the endodontic
retreatment procedure: G1 – conventional technique + solvent, G2
– conventional technique without solvent, G3 – ProTaper retreatment
+ solvent, G4 – ProTaper retreatment without solvent. In all groups,
gutta-percha in the coronal portion was removed by using size 1-3
Gates Glidden drills. All teeth were irrigated with distilled water. The
debris extruded through the foramen were collected and weighed by an analytical balance. Results: Group 4 had the lowest average for
material extrusion through the foramen followed by groups 2, 3 and
1. When Tukey test for statistical analysis was applied, no significant
difference among groups were found (p = 0.5664). Conclusion: We
conclude that all instrumentation techniques used in this study
produced debris which goes beyond the foramen.