Mechanical Properties of Various Glide Path Preparation Nickel-titanium Rotary Instruments

Lee, Joo-Yeong; Kwak, Sang Won; Ha, Jung‐Hong; Abu-Tahun, Ibrahim H.; Kim, Hyeon‐Cheol

doi:10.1016/j.joen.2018.10.017

Cited by 18 publications

(30 citation statements)

References 28 publications

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“…All these characteristics combined and associated with the kinematics [ 10 ], which is probably one of the most relevant characteristics, lead the reciprocating R-Pilot to have a significantly higher time to fracture than both the other rotation systems. These results partially corroborate previous studies where both the R-Pilot and Edge Glide Path were superior to ProGlider [ 25 , 26 ]. Although direct comparisons are hindered by the different test settings [ 27 ], these non-corroborating previous results for the Edge Glide Path vs. ProGlider should not be seen as inconsistent due to the high internal validity of cyclic fatigue testing.…”

Section: Discussionsupporting

confidence: 91%

“…Although direct comparisons are hindered by the different test settings [ 27 ], these non-corroborating previous results for the Edge Glide Path vs. ProGlider should not be seen as inconsistent due to the high internal validity of cyclic fatigue testing. Lee et al, who noted differences between the ProGlider and Edge Glide Path [ 25 ] reported a mean fragment length between 2.33 mm (Edge Glide Path) and 2.82 mm (ProGlider), while the lengths in the present study were 7.0 mm and 7.1 mm due to the tests being conducted at different file positions. The fact that Lee et al [ 25 ] noticed a significant difference between files does not contradict the present study since it can be partially explained by the multi-taper characteristics of both instruments, which may not necessarily match, and despite the setting differences, they could end up complementing each other.…”

Section: Discussioncontrasting

confidence: 62%

“…Lee et al, who noted differences between the ProGlider and Edge Glide Path [ 25 ] reported a mean fragment length between 2.33 mm (Edge Glide Path) and 2.82 mm (ProGlider), while the lengths in the present study were 7.0 mm and 7.1 mm due to the tests being conducted at different file positions. The fact that Lee et al [ 25 ] noticed a significant difference between files does not contradict the present study since it can be partially explained by the multi-taper characteristics of both instruments, which may not necessarily match, and despite the setting differences, they could end up complementing each other. Additionally, and although not assessed in the present study, previously published SEM analysis of the fractures’ surfaces of these same three tested instruments detected dimples and fatigue striations that characterize cyclic fatigue failure [ 25 , 28 ].…”

Section: Discussioncontrasting

confidence: 62%

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Multimethod Assessment of the Cyclic Fatigue Strength of ProGlider, Edge Glide Path and R-Pilot Endodontic Instruments

et al. 2022

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Background: The aim of this study was to comprehensively evaluate the cyclic fatigue strength of ProGlider, Edge Glide Path, and R-Pilot instruments. Methods: Sixty-three instruments were submitted to a multimethod evaluation. Their design was analyzed by stereomicroscopy and scanning electron microscopy, including the number of blades, helical angle means, cross-sectional design, surface finishing, and symmetry. Energy-dispersive X-ray spectroscopy was used determine the nickel/titanium elements ratio, and differential scanning calorimetry determined the instruments’ phase transformation temperatures. The cyclic fatigue tests were conducted in an artificial canal with a 6 mm radius and 86 degrees of curvature. The Mood’s median test and one-way ANOVA were used to determine differences, with the significance level set at 0.05. Results: The ProGlider presented the highest number of blades (n = 21), while R-Pilot had the highest helical angles (26.4°). Differences were noted in the instruments’ cross-sections and surface finishing. The ProGlider and R-Pilot showed some similarities regarding the phase transformation temperatures but differed from the Edge Glide Path. All alloys showed an almost equiatomic nickel/titanium ratio. The R-Pilot instruments showed a significantly higher (p < 0.05) time to fracture than both the other files. Conclusion: Reciprocating R-Pilot instruments showed a higher cyclic fatigue time to fracture than the ProGlider and Edge Glide Path rotary files.

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Section: Discussionsupporting

confidence: 91%

Section: Discussioncontrasting

confidence: 62%

Section: Discussioncontrasting

confidence: 62%

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Multimethod Assessment of the Cyclic Fatigue Strength of ProGlider, Edge Glide Path and R-Pilot Endodontic Instruments

et al. 2022

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“…Despite the lack of previous studies comparing the torsional properties between R-Pilot and One G, the torsional strength and angular rotation of these instruments are similar to those reported by other authors. 29,30 The different torsional properties could be related to the different cross-sectional design, taper, and tip diameter between the instruments. Previous studies have reported that instruments with greater metal mass volume and tip diameter tend to present higher torsional strength and lower angle rotation to failure.…”

Section: Discussionmentioning

confidence: 99%

Torsional fatigue strength of reciprocating and rotary pathfinding instruments manufactured from different NiTi alloys

et al. 2019

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To evaluate the torsional properties of engine-driven pathfinding instruments manufactured from different NiTi alloys-R-Pilot (tip size 12.5;.04 taper; M-Wire) and One G (tip size 14;.03 taper; Conventional NiTi). A total of 40 NiTi instruments from engine-driven pathfinding instruments (n = 20) were used. The torsion tests followed ISO 3630-1 (1992). Three millimeters of each instrument tip was fastened to a small load cell by a lever arm linked to the axis of torsion. During the test, the torsion testing machine software measured the maximum torsional strength and angle of rotation (0) before instrument failure. The fractured surface of each instrument was assessed by scanning electron microscopy (SEM). In addition, a supplementary examination was performed to measure the cross-sectional area and the metal mass volume of each instrument 3 mm from the tip. Data were analyzed using a t-test, with significance level set at 5%. R-pilot had significantly higher torsional strength than did One G (p < 0.05). Regarding the angle of rotation to fracture, One G had higher angles than did R-Pilot (p < 0.05). The supplementary examination showed that R-Pilot had the highest cross-sectional area and volume of metal mass at 3 mm from the tip (p < 0.05). R-pilot (M-Wire NiTi alloy) had a significantly higher torsional strength and One-G (superelastic NiTi alloy) had the highest angle of rotation to fracture.

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“…Second, when the instrument binds to dentin, while its rotation remains. In this case, plastic deformation or a torsional fracture occurs [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of mechanical properties of coronal flaring nickel-titanium instruments

Weissheimer

Só

Alcalde

et al. 2020

Preprint

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Background: The aim of this study was to evaluate the bending and torsional resistance of the following instruments: Mtwo 25.07, Navigator W-XN, ProTaper SX, MK Orifice Shapper and MK Sequence 17.12. Methods: One hundred instruments were used (n=20). Resistance to bending (n=10), torque and angular deflection (n=10) at the failure of new instruments were measured according to ISO 3630-1. The fractured surface of each fragment was examined by scanning electron microscopy (SEM). Data were analyzed using 1-way analysis of variance and Tukey tests. Results: Torsional resistance values of MK Sequence were higher than the other groups (P<.05). No differences were observed among Mtwo 25.07, W-XN and MK Orifice Shapper (P>.05) and ProTaper SX, which presented the lowest values (P<.05). Mtwo 25.07 showed the highest angular deflection (P<.05). W-XN and ProTaper SX presented no significant difference (P>.05). ProTaper SX and MK Orifice Shapper also showed no significant differences (P>.05). MK Sequence 17.12 instruments had the lowest angular deflection values (P<0.5). There were significant differences among all the groups in bending stiffness test (P<.05), but ProTaper SX had the lowest torque to bend (P<.05). MK Sequence 17.12 presented the larger cross-sectional area at 3mm from the tip. SEM analysis showed similar and typical features of torsional failure for all instruments tested.Conclusions: In conclusion MK Sequence 17.12 had the highest torsional fracture resistance. Mtwo 25.07 showed higher angular deflection capacity, and ProTaper SX the lower bending stiffness.

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Mechanical Properties of Various Glide Path Preparation Nickel-titanium Rotary Instruments

Cited by 18 publications

References 28 publications

Multimethod Assessment of the Cyclic Fatigue Strength of ProGlider, Edge Glide Path and R-Pilot Endodontic Instruments

Multimethod Assessment of the Cyclic Fatigue Strength of ProGlider, Edge Glide Path and R-Pilot Endodontic Instruments

Torsional fatigue strength of reciprocating and rotary pathfinding instruments manufactured from different NiTi alloys

Evaluation of mechanical properties of coronal flaring nickel-titanium instruments

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