OneShape rotary instrument retains original canal curvatures, Finds study

Shaping ability of a file plays an important role during instrumentation in an endodontic treatment. Rotary NiTi (nickel-titanium) instruments are designed to shape the canals. Their performance and safety have always been a subject of interest among practitioners in the presence of anatomical challenges.

Canal curvature is a parameter that can challenge the performance of a file; hence respecting the anatomy of a canal in the presence of curvature is a desired characteristic of any rotary instrument considering the root canal morphology.

A recent analysis conducted at the Department of Clinical Sciences, Ajman University, Ajman, United Arab Emirates has found out that among OneShape (OS), Hero Shaper (HS), and Revo-S (RS) instruments, OneShape (OS) file system maintained the original canal curvatures well.

The study is published in the BMC Oral Health Journal.

Pouyan Vakili-Gilani and colleagues aimed to compare the shaping ability of OneShape (OS), Hero Shaper (HS), and Revo-S (RS) instruments in simulated L-shaped canals.

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.

For further reading, log into:

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