Screw-in forces during instrumentation by various file systems

Ha, Jung-Hong; Kwak, Sang Won; Kim, Sung-Kyo; Kim, Hyeon‐Cheol

doi:10.5395/rde.2016.41.4.304

Cited by 30 publications

(28 citation statements)

References 27 publications

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“…Reciproc has been shown to generate larger screw-in force than several other NiTi instruments 36) . The "screwin effect" can be defined as the tendency of a rotary file to be "pulled" into the canal by an apical driving force produced through the engagement of spirally configured blades in the canal wall dentin during rotation 37) .…”

Section: Discussionmentioning

confidence: 96%

Enhanced root canal-centering ability and reduced screw-in force generation of reciprocating nickel-titanium instruments with a post-machining thermal treatment

et al. 2020

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This study aimed to evaluate the influence of a post-machining thermal treatment on canal-centering ability and torque/force generation of reciprocating nickel-titanium instruments. Simulated J-shaped resin canals were prepared with reciprocating instruments sharing identical geometric architecture and with/without post-machining thermal treatment (Reciproc Blue/Reciproc, VDW, Munich, Germany). Using an original automated root canal instrumentation and torque/force analyzing device, files were operated in a combination of reciprocation and up-and-down motion, and torque/force values were monitored. Canal-centering ratios were measured after superimposition of pre-and post-instrumentation images. Compared with Reciproc, Reciproc Blue showed a significantly lower canal-centering ratio (i.e., less deviation; p<0.05) at 0-1 mm from the apex and generated a significantly smaller upward maximum vertical force (p<0.05). Under standardized conditions using the automated device, Reciproc Blue showed better canal-centering ability and reduced screw-in forces than Reciproc, indicating that the post-machining thermal treatment confers superior performance to reciprocating nickel-titanium instruments.

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Section: Discussionmentioning

confidence: 96%

Enhanced root canal-centering ability and reduced screw-in force generation of reciprocating nickel-titanium instruments with a post-machining thermal treatment

et al. 2020

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“…The mechanical performance of the NiTi endodontic instrument may also affect the stress that is applied to the root canal wall during shaping. Whereas torque and apical force generation are essential for the removal of infected dentin, excessive torque/force may lead to the generation of a screw-in effect, which may increase the torsional fatigue and lead to a binding and separation of the instrument 25) . In this study, maximum values for an upward apical force and CCW torque were obtained, both of which were generated by screw-in forces, and which were significantly smaller in the WOG Primary compared with the RE R25.…”

Section: Discussionmentioning

confidence: 99%

Assessment of mechanical properties of WaveOne Gold Primary reciprocating instruments

et al. 2019

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This study aimed to evaluate cyclic fatigue resistance and bending properties and torque/force generation of WaveOne Gold (WOG) Primary in comparison with WaveOne (WO) Primary and Reciproc (RE) R25. A cyclic fatigue test revealed that the WOG Primary took significantly longer time to fracture compared with the WO Primary (p<0.05). The WOG Primary had the smallest load values at a deflection of 0.5 and 2 mm (p<0.05), as measured with a cantilever bending test. Torque/force measurement demonstrated that maximum upward force and maximum counterclockwise torque values in the WOG Primary were significantly lower than those in the RE R25 (p<0.05). Under the present experimental condition, the WOG Primary showed a higher cyclic fatigue resistance compared with the WO Primary, a higher flexibility compared with the WO Primary and RE R25, and generated a significantly lower maximum torque compared with the RE R25.

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“…In this study, EDM showed greater screw-in force levels than GPF and RaCe (Fig. 6), which may be ascribed to the larger taper of EDM compared with the other instruments tested 36,37) . There was no difference in the maximum value of the screw-in force between GPF and RaCe, which have the same square cross-sectional shape, tip size, and taper.…”

Section: Discussionmentioning

confidence: 53%

Evaluation of selected mechanical properties of NiTi rotary glide path files manufactured from controlled memory wires

Nishijo

Ebihara

Tokita

et al. 2018

Dental Materials Journal

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This study aimed to investigate mechanical properties related to flexibility and fracture resistance of controlled memory wiremanufactured nickel-titanium rotary glide path files [HyFlex EDM Glide Path File (EDM) and HyFlex GPF (GPF)]. Scout RaCe (RaCe) served as control. Bending loads, torsional/cyclic fatigue resistance, and screw-in forces were measured. EDM showed a significantly larger torque at fracture, a longer time to cyclic fracture in reciprocation and a larger screw-in force compared with GPF and RaCe. GPF showed significantly lower bending loads and higher angular deflection values than EDM and RaCe, and a significantly longer time to cyclic fracture than RaCe. The time to cyclic fracture was significantly longer in reciprocation compared with continuous rotation in EDM and GPF. It can be concluded that EDM and/or GPF showed higher flexibility and cyclic/torsional fatigue resistance compared with RaCe; and that reciprocation conferred better cyclic fatigue resistance to EDM and GPF.

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Screw-in forces during instrumentation by various file systems

Cited by 30 publications

References 27 publications

Enhanced root canal-centering ability and reduced screw-in force generation of reciprocating nickel-titanium instruments with a post-machining thermal treatment

Enhanced root canal-centering ability and reduced screw-in force generation of reciprocating nickel-titanium instruments with a post-machining thermal treatment

Assessment of mechanical properties of WaveOne Gold Primary reciprocating instruments

Evaluation of selected mechanical properties of NiTi rotary glide path files manufactured from controlled memory wires

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