Efficacy of NiTi rotary systems cleaning process compared to manual instruments in narrow and flattened root canals

Josiane de Almeida, Gustavo G. Nascimento, Ezilmara L. R. Sousa

Objective: To compare, ex vivo, the cleanness efficacy of three rotary systems (Mtwo, K3, and ProTaper) and a manual one (K-Flexofile) in narrow and flattened root canals, based on dye removal from dentin walls. Methods: Root canals of 40 human teeth were filled with black ink. Once the dye had dried, the teeth were randomly divided into four groups (n = 10), according to the instrumentation system used: G1 = Mtwo; G2 = K3; G3 = ProTaper, and G4 = K-Flexofile. After instrumentation, teeth were split longitudinally. Qualitative analysis was based on the amount of remaining dye adhered to dentin walls in the apical, middle and coronal thirds of the root canal, and also on the overall amount, according to four scores. For quantitative analysis, each root canal split was scanned and analyzed by Image Tool software. Cleanness efficacy was determined by quantifying the difference between the total area of each root canal and the noninstrumented area in mm2. Data were subjected to Kruskal-Wallis test or one-way ANOVA and Bonferroni post hoc tests (p < 0.05). Results: No thoroughly cleaned root canals were found. Nonstatistically significant difference was apparent among instrumentation systems at the qualitative analysis (p > 0.05). In terms of quantitative analysis, Mtwo instruments presented significantly superior cleanness efficacy compared to the other systems (p < 0.05). Conclusions: In general, cleanness efficacy of the Mtwo system was slightly superior compared to that of K3, ProTaper and K-Flexofile instruments, within the parameters of the present study and regardless of limitations.

Keywords: Dentin. Endodontics. Root canal preparation.

How to cite: Almeida J, Nascimento GG, Sousa ELR. Efficacy of NiTi rotary systems cleaning process compared to manual instruments in narrow and flattened root canals. Dental Press Endod. 2015 May-Aug;5(2):45-50. DOI: http://dx.doi.org/10.14436/2358-2545.5.2.045-050.oar

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