Cutting efficiency of instruments with different movements: a comparative study.
OBJECTIVE
The aim of the present study was to evaluate the cutting efficiency of two new reciprocating instruments, Twisted File Adaptive and WaveOne Primary.


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.
Department of Endodontics, "Sapienza" University of Rome Italy.
Luigi
L
Tocci
Department of Endodontics, "Sapienza" University of Rome Italy.
Gianluca
G
Plotino
Department of Endodontics, "Sapienza" University of Rome Italy.
Dina
D
Al-Sudani
Department of Endodontics, "Sapienza" University of Rome Italy.
Alessio Giansiracusa
AG
Rubini
Department of Endodontics, "Sapienza" University of Rome Italy.
Gianpaolo
G
Sannino
Department of Endodontics, "Sapienza" University of Rome Italy.
Lucila
L
Piasecki
Department of Endodontics, "Sapienza" University of Rome Italy.
Ermanno
E
Putortì
Department of Endodontics, "Sapienza" University of Rome Italy.
Luca
L
Testarelli
Department of Endodontics, "Sapienza" University of Rome Italy.
Gianluca
G
Gambarini
endodontics; instrumentation; materials testing