Effectiveness of supplementary irrigant agitation with the Finisher GF Brush on the debridement of oval root canals instrumented with the Gentlefile or nickel titanium rotary instruments

Abstract

Aim

To examine the efficacy of a novel supplementary irrigant agitating brush (Finisher GF Brush, Medic NRG) on the debridement of root canals prepared with a novel stainless-steel rotary instrumentation system (Gentlefile, MedicNRG, Kibbutz Afikim, Israel), or nickel titanium rotary instruments in oval root canals.

Methodology

Mandibular premolars (n=72) were selected and divided randomly into three experimental groups (n=24) after microCT scanning: group 1, rotary NiTi to size 20, .04 taper (R20); group 2, rotary NiTi to size 25, .04 taper (R25) and, group 3, Gentlefile size 23, .04 taper (GF). Specimens were subdivided into two subgroups: subgroup A, Syringe-and-needle (SNI); subgroup B, Finisher GF Brush (GB). Ten untreated canals served as controls. Specimens were processed for histological evaluation and the remaining pulp tissue (RPT) was measured. Data were analysed using Mann-Whitney and Kruskal-Wallis tests (P=0.05).

Results

All experimental groups had significantly less RPT than the control (P<0.05). Group 3B (GF-GB) had significantly less RPT than groups 1B (R20-GB) and 2B (R25-GF) (P<0.05). When irrigated with SNI, there was no significant difference in the RPT between the three groups (P>0.05). When instrumented with R20, there was no significant difference between SNI and GF (P<0.05) while GB had significantly less RPT than SNI for R25 (P<0.05).

Conclusions

Supplementary irrigant agitation with the Finisher GF Brush improved debridement of canals prepared with Gentlefile and size 25, .04 taper rotary NiTi. Root canal debridement did not significantly differ between the instruments when syringe irrigation was used.

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