Performance of progressive and constant tapered instruments rotary systems at canal preparation

Bruna Genari,Fabrício Mezzomo Collares,Susana Maria Werner Samuel,Ruggiero Silveira Stello,Fabiana Soares Grecca,Paul Michael Howell Dummer

doi:10.1590/1981-863720180003000053366

Bruna Genari, Fabrício Mezzomo Collares + Show 4 more

Open Access

https://doi.org/10.1590/1981-863720180003000053366

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Abstract

ABSTRACT Objective: The aim of this study was to compare the performance of two nickel-titanium rotary systems regarding the preparation time, final shape of canal, incidence of aberration, transportation, and fracture of instrument. Methods: A total of 40 simulated canals in resin blocks with 30o curves and a length of 17 mm were divided randomly into two groups: preparation with ProTaper and BioRaCe systems up to F5 and BR5 respectively. Pre- and post-operative canal images were taken and superimposed in order to identify aberrations, transportation, and to take measurements of the canal width. In addition, the preparation time and instrument fractures were recorded. The data were analyzed using Student's t test. Results: There is no difference (p>.05) comparing the systems regarding preparation time, canal aberration, and instrument fracture rates. The progressive tapered instruments of ProTaper prepared significantly larger canal widths in the apical third (p<.05). Conclusion: Overall, both systems provided safe canal preparation, associated with few canal aberrations and instrument fractures.

Highlights

The great variation in teeth anatomy could complicate the shaping and disinfection in the root canal preparation and lead to deviations and aberrations [1,2]
The instruments of the systems have difference in the design – taper, blade, tip – which could influence the final shape of the root canal, preparation time, incidence of aberrations, and transportation [6,7]
Despite having the triangular cross-sectional design and non-cutting tip, the BioRaCe instruments present a constant taper and alternating cutting edge. These systems present a difference in taper design that could influence the final shape of the canal and preparation time [7,8]

Summary

Introduction

The great variation in teeth anatomy could complicate the shaping and disinfection in the root canal preparation and lead to deviations and aberrations [1,2]. The instruments of the systems have difference in the design – taper, blade, tip – which could influence the final shape of the root canal, preparation time, incidence of aberrations, and transportation [6,7]. Despite having the triangular cross-sectional design and non-cutting tip, the BioRaCe instruments present a constant taper and alternating cutting edge. These systems present a difference in taper design (progressive and constant) that could influence the final shape of the canal and preparation time [7,8]

Methods

Results

Discussion

Conclusion