In Vivo Evaluation of Operative Torque Generated by Two Nickel-Titanium Rotary Instruments during Root Canal Preparation

Gianluca Gambarini, Massimo Galli, Marco Seracchiani, Dario Di Nardo, Marco A Versiani, Lucila Piasecki, Luca Testarelli, Gianluca Gambarini, Massimo Galli, Marco Seracchiani, Dario Di Nardo, Marco A Versiani, Lucila Piasecki, Luca Testarelli

Abstract

Objectives: This in vivo study evaluated the operative torque and preparation time of ProTaper NEXT (Dentsply Maillefer; Ballaigues, Switzerland) and EdgeFile X7 (EdgeEndo; Albuquerque, New Mexico, United States) rotary systems during root canal preparation of maxillary premolars.

Materials and methods: Ten double-rooted maxillary premolars with independent canals were selected. Each canal in each tooth was prepared with one of the rotary systems (n = 10), ProTaper NEXT or EdgeFile X7. The instruments were rotated at 300 rpm with maximum torque set at 2 N.cm using an electric motor (KaVo; Biberach, Germany) that automatically recorded torque values at every 1/10th of a second (ds).

Statistical analysis: Operative torque (N.cm) and preparation time (s) of the first shaping instrument (size 17/.04) of both rotary systems were recorded and statistically compared using the Mann-Whiney U test with a significance level set at 5%.

Results: No instrument exhibited flute deformation or underwent intracanal failure. No differences were found between the instruments regarding the maximum (peak) torque values (p > 0.05). EdgeFile X7 17/.04 required significantly less preparation time (3.75 seconds interquartile range [IQR]: 3.2-9.0) than ProTaper NEXT X1 (15.45 seconds IQR: 8.35-21.1) (p < 0.05). The median operative torque values of ProTaper NEXT X1 (0.26 N.cm; IQR: 0.18-0.49) were significantly higher compared with EdgeFile X7 17/.04 (0.09 N.cm; IQR: 0.05-0.17) (p < 0.05).

Conclusions: Although no difference was found between the median peak torque values of ProTaper NEXT X1 and EdgeFile X7 17/.04 instruments, the operative torque and instrumentation time results were impacted by their different designs and alloys during clinical preparation of root canals.

Conflict of interest statement

None declared.

Dental Investigation Society.

Figures

Fig. 1
Fig. 1
Cross-sectional aspect of the ProTaper NEXT X1 (A) and Edge–File X7 (B).
Fig. 2
Fig. 2
The instrumentation adopted for the study: motor and handpiece.
Fig. 3
Fig. 3
Operative clinical torque (N.cm) and time (in deciseconds) measured during preparation of the root canals of a same tooth using ProTaper NEXT X1 (A) and EdgeFile X7 17/.04 (B) instruments.

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Source: PubMed

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