Effects of Electropolishing Surface Treatment on the Cyclic Fatigue Resistance of BioRace Nickel-Titanium Rotary Instruments

Lopes, Hélio Pereira; Elias, Carlos Nelson; Vieira, Víctor Talarico Leal; Moreira, Edson Jorge Lima; Marques, Raquel Villela Lemes; Oliveira, Julio Cezar M.; Debelian, Gilberto; Siqueira, José F.

doi:10.1016/j.joen.2010.06.026

Cited by 89 publications

(93 citation statements)

References 19 publications

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“…This indicates that Reciproc is more flexible than the other instruments; hence, the second null hypothesis was rejected. Several previous studies demonstrated that rigid instruments present a lower number of cycles to fracture as a consequence of the build-up of tensions at the point of maximum flexure (2,4,9,10,14). However, despite the greater flexibility of WaveOne Gold, no differences were observed between WaveOne and WaveOne Gold in terms of cyclic fatigue fracture resistance.…”

Section: Discussionmentioning

confidence: 90%

See 1 more Smart Citation

Bending resistance and cyclic fatigue life of a new single-file reciprocating instrument WaveOne Gold

Silva¹,

Tinoco²,

Tinoco³

et al. 2017

Eur Endod J

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Objective: The present study aimed to evaluate the bending resistance and cyclic fatigue fracture resistance of a new single-file reciprocating instrument called WaveOne Gold. Reciproc and WaveOne instruments were used as references for comparison. Methods: Sixty 25-mm NiTi instruments (Reciproc R25, WaveOne Primary and WaveOne Gold Primary) were tested. Flexibility was determined by applying 45° bending tests using a universal testing machine (n=10). A custom-made device was used during cyclic fatigue test (n=10), comprising a stainless steel artificial canal measuring 1.4 mm in diameter, 19 mm in total length with an 86° angle and 6 mm radius of curvature. Possible deformations at the helical shaft and mode of fracture were evaluated using scanning electron microscopy analysis. Statistical analysis was performed using one-way analysis of variance. Post hoc pair-wise comparisons were performed using Tukey's test for multiple comparisons (P<0.05). Results: WaveOne presented significantly higher bending resistance than the other tested systems (P<0.05), whereas Reciproc presented the lowest bending resistance (P<0.05). Reciproc revealed a significantly longer cyclic fatigue fracture resistance than the other systems (P<0.05). Conclusions: Although WaveOne Gold presented higher flexibility than WaveOne, no differences in the resistance to fatigue were observed between both systems. The Reciproc files were more flexible and resistant to fatigue for the angle of curvature of 86° and 6 mm radius than WaveOne and WaveOne Gold files.

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Section: Discussionmentioning

confidence: 90%

“…A 20N load was applied at 15 mm/min by means of a flexible stainless steel wire with one end fastened to the testing machine head and the other end attached 3 mm from the instrument tip, as previously described (9,10). This test was conducted until the tip of each specimen underwent an elastic displacement of 45°.…”

Section: Bending Resistance Testmentioning

confidence: 99%

Bending resistance and cyclic fatigue life of a new single-file reciprocating instrument WaveOne Gold

Silva¹,

Tinoco²,

Tinoco³

et al. 2017

Eur Endod J

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show abstract

“…10,[12][13][14][15] The mounting rod allowed the fixation of the handpiece, which was regulated by a manual adjustment screw. The device allows vertical movement of the instrument in the longitudinal axis of the straight part of the metallic canal.…”

Section: • Continuous Cyclic Fatigue Testmentioning

confidence: 99%

Effect of autoclave cycles on cyclic fatigue resistance of control memory NiTi files observed by scanning electron microscopy

Vieira

Lopes

Elias

et al. 2017

Rev. Bras. Odontol.

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Objective: Hyflex CM instruments were developed for debridement of the root canal system. The control-memory alloy recovers its shape on sterilization, thereby allowing instrument reuse. This study investigated the effect of shape recovery by sterilization on the fatigue life and crack formation of Hyflex CM NiTi instruments. Material and Methods: the cyclic fatigue test was performed in two groups: In the first, it was continuously performed to establish the fatigue life (group 1, n = 10); in the second, it was performed with outages of 30s to evaluate cracks' nucleation and propagation (group 2, n = 10). The test was performed using a stainless steel canal that was 1.5mm in diameter and 3.5mm in depth, with an arc of 9.42mm and radius of curvature of 6mm. The instruments were driven at 300 rpm. The fatigue time was recorded using a digital stopwatch (Technos). An electronic microscope (Quanta 250) was used to observe the crack formation and growth during the cyclic fatigue. Results: the autoclaved instruments endured 1196.67+214.63 cycles, and the non-autoclaved endured 1000+199.42 cycles until the occurrence of fracture. The t-student test (α=5%) revealed a significant difference. The cyclic fatigue test with pauses demonstrated a significantly longer cyclic fatigue life than the continuous cyclic fatigue test (p<0.05). Conclusion: as revealed by SEM images, cracks grow with an increase in the number of cycles to fracture (NCF). It can be concluded that the shape of Hyflex CM instruments recovered by autoclaving withstood significantly more NCF than non-autoclaved instruments (p<0.05), demonstrating an improvement of approximately 16%.

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“…Cyclic fatigue fracture occurs as consequence of the continuous rotation of an instrument in a curved space. In this condition, the instrument under elastic deformation is subjected to a mechanical load represented by alternating tensile and compressive stresses 19 , leading to instrument fracture by low-cycle fatigue mechanism [20][21] . Cyclic fatigue resistance comprises thus the number of cycles that an instrument can endure until fracture under a specific load condition.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of foraminal transportation during foraminal enlargement with different instrumentation systems

et al. 2014

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Aim: To evaluate the foraminal transportation during foraminal enlargement after manual instrumentation with stainless steel files, preparation with the Mtwo system and Reciproc R25 file. Methods: Thirty roots were selected, divided in three groups and prepared in accordance with the different instrumentation systems: Hand Files (HF); Mtwo system (MS); and Reciproc system (RS). All groups were prepared with the instrumentation level 1 mm beyond the apex. Photomicrographs were performed using scanning electron microscopy, to record the foraminal anatomy before and after instrumentation. Data were analyzed using ANOVA followed by Tukey's test with a significance level of 5%. Results: The group instrumented with hand files showed higher foraminal transportation when compared to the Mtwo and Reciproc groups (p<0.05). Reciproc group showed lower transportation when compared to the Mtwo group (p<0.05). Conclusions:The stainless steel files caused significant foraminal transportation, while Reciproc system showed safe apical preparation, with little transportation.

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Effects of Electropolishing Surface Treatment on the Cyclic Fatigue Resistance of BioRace Nickel-Titanium Rotary Instruments

Cited by 89 publications

References 19 publications

Bending resistance and cyclic fatigue life of a new single-file reciprocating instrument WaveOne Gold

Bending resistance and cyclic fatigue life of a new single-file reciprocating instrument WaveOne Gold

Effect of autoclave cycles on cyclic fatigue resistance of control memory NiTi files observed by scanning electron microscopy

Evaluation of foraminal transportation during foraminal enlargement with different instrumentation systems

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