Cutting Efficiency of Instruments with Different Movements: a Comparative Study

Abstract

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.

Cutting efficiency of conventional and heat‐treated nickel–titanium rotary or reciprocating glide path instruments

“…, Tocci et al . ). This experimental bias is amplified when glide path instruments are tested because they have greater flexibility due to their thin cross‐sectional area and small dimensions.…”

“…All new instruments were inspected using an optical stereomicroscope at ×20 magnification for morphological analysis and for any signs of deformation (Tocci et al . , Pedullà et al . ).…”

“…, Tocci et al . ) but with several new features. A crankshaft transmitted the rotation from the step‐by‐step motor to two chucks between which the tested instrument is held.…”

“…A total of 120 new NiTi glide path instruments (HEGF, OG, RP and WOGG), 25-mm in length, were used in the present study (30 for each brand). All new instruments were inspected using an optical stereomicroscope at 920 magnification for morphological analysis and for any signs of deformation (Tocci et al 2015, Pedull a et al 2017).…”

Classification and cyclic fatigue evaluation of new kinematics for endodontic instruments

“…The resulting speed, however, has not been disclosed (17,18). The adaptive motion starts with a CR when no or minimal load is applied on the instruments, and the kinematic automatically changes into a RR motion when the instrument meets any resistance.…”