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J Oral Maxillofac Res. 2015 Mar 30;6(1):e6. doi: 10.5037/jomr.2014.6106. eCollection 2015 Jan-Mar.

Cutting efficiency of instruments with different movements: a comparative study.

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1
Department of Endodontics, "Sapienza" University of Rome Italy.

Abstract

OBJECTIVES:

The aim of the present study was to evaluate the cutting efficiency of two new reciprocating instruments, Twisted File Adaptive and WaveOne Primary.

MATERIAL AND METHODS:

10 new Twisted File Adaptive (TF Adaptive) (SybronEndo, Glendora, CA, USA) and 10 new WaveOne Primary files (Dentsply Maillefer, Ballaigues, Switzerland) were activated using a torque-controlled motor, respectively TFA motor (SybronEndo, Glendora, CA, USA) and Silver motor (VDW, Munich, Germany). The device used for the cutting test consisted on a mainframe to which a mobile plastic support for the hand-piece is connected and a stainless-steel block containing a Plexiglas block against which the cutting efficiency of the instruments was tested. The length of the block cut in 1 minute was measured in a computerized program with a precision of 0.1 mm. Mean and standard deviations of each group were calculated and data were statistically analyzed with one-way ANOVA and Bonferroni t test (P < 0.05).

RESULTS:

TF Adaptive displayed significantly greater maximum penetration depth than WaveOne Primary (P < 0.05). In fact, TF Adaptive instruments (Group 1) cut the Plexiglas block to a mean depth of 8.7 (SD 0.5) mm, while WaveOne Primary instruments cut the Plexiglas block to a mean depth of 6.4 (SD 0.3) mm.

CONCLUSIONS:

Twisted File Adaptive instruments demonstrated statistically higher cutting efficiency than WaveOne instruments.

KEYWORDS:

endodontics; instrumentation; materials testing

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