OneShape rotary instrument retains original canal curvatures, Finds study

The authors simulated a total of forty-eight L-shaped canals, all of which were prepared to an apical size of 25 using the three file systems: OneShape, Hero Shaper and Revo-S (all from Micro-Mega SA, Besançon, France), with each system being used to prepare 16 canals.

The amount of resin removed after each canal's preparation was measured and compared after producing a composite image made from the superimposition of pre and post-instrumented canals. Canal aberrations and the preparation time were also recorded. The data were statistically analysed by using ANOVA, Tukey, and Chi-square tests.

The study results showed that one file fractured during instrumentation in the Revo- S group. Also, a significant difference was found at the apical end of the prepared simulated canal between the groups, with Revo-S showing the least amount of resin removal from the inner side of the canals and Hero Shaper showing the highest amount of resin removal from the outer side (P < 0.05).

Regarding the total width of the canals after preparation, a significant difference was found between the groups at the apical end and the straight portion of the canals, and Revo-S removed the least amount of resin at the straight portion of the canals (P < 0.05). No statistically significant differences were found between the different instruments regarding canal aberrations' incidence (P > 0.05).

As a result, it was concluded that all of the files showed a tendency to straighten the canals, whereas OS files maintained the original canal curvatures well.

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Vakili-Gilani, P., Tavanafar, S., Saleh, A.R.M. et al. Shaping ability of three nickel-titanium rotary instruments in simulated L-shaped canals: OneShape, Hero Shaper, and Revo-S. BMC Oral Health 21, 378 (2021). https://doi.org/10.1186/s12903-021-01734-6