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Ali Keles - One of the best experts on this subject based on the ideXlab platform.
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Comparison of cyclic fatigue resistance of Rotate instrument with reciprocating and continuous rotary nickel–titanium instruments at body temperature in relation to their transformation temperatures
Clinical Oral Investigations, 2020Co-Authors: Cangul Keskin, Ali Keles, Özlem Sivas Yilmaz, Ugur InanAbstract:Objective The aim of this study was to compare the cyclic fatigue resistance at body temperature and phase transformation behaviors of novel Rotate instrument (25.06) with rotating Mtwo (25.06) and reciprocating Reciproc Blue (25.08) and Reciproc (25.08) instruments. Materials and methods The Rotate, Reciproc Blue, Reciproc, and Mtwo instruments free of visible deformations were collected and Tested in a static cyclic fatigue Test method, which has a ceramic block containing an artificial canal with 60° angle of curvature and a 5-mm radius of curvature at 37 °C ( n = 16). All instruments were operated until fracture occurred, and both time to fracture (TF) and the lengths of the fractured fragments were recorded. TF data was analyzed with one-way ANOVA followed by post hoc Tukey Tests and Weibull analysis, and fractured fragment length data were subjected to one-way ANOVA and post hoc Tukey Tests ( P < 0.05). Two unused instruments from each brand were also subjected to differential scanning calorimetry (DSC) analysis to determine their phase transformation temperatures. Results The Reciproc Blue instruments showed significantly higher TF values and reliability than the other groups ( P < 0.05). Rotate instruments exhibited greater cyclic fatigue resistance than the Reciproc and Mtwo instruments ( P < 0.05). No significant difference was detected among the fractured fragment lengths ( P > 0.05). The lowest austenite finish temperature was exhibited by the Mtwo, which presented a single transformation peak, followed by the Rotate, Reciproc Blue, and Reciproc instruments which all presented two peaks during transformation. Conclusions Cyclic fatigue resistance of instruments manufactured from thermally treated Blue wire instruments was superior to those of the Mtwo and Reciproc, whereas reciprocating the Blue wire showed the highest resistance. Clinical relevance The present study compared the cyclic fatigue resistance of the novel Rotate instrument with similar instruments manufactured from conventional nickel–titanium, m-wire, and Blue wire at body temperature and reported that Blue-treated instruments exhibited superior cyclic fatigue resistance.
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Cyclic fatigue resistance of R-Pilot, WaveOne Gold Glider, and ProGlider glide path instruments
Clinical Oral Investigations, 2018Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:Objective The aim of the present study was to compare the cyclic fatigue resistance of R-Pilot (VDW; Munich, Germany) with ProGlider (Denstply Sirona; Ballaigues, Switzerland) and WaveOne Gold Glider (Denstply Sirona; Ballaigues, Switzerland) glide path instruments. Materials and methods R-Pilot, ProGlider, and WaveOne Gold Glider instruments were collected ( n = 15) and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and both time to fracture (TF) and the lengths of the fractured fragments were recorded. Mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data and fractured fragment length data were subjected to one-way ANOVA and post-hoc Tukey Tests ( P 0.05). Conclusions The reciprocating WaveOne Gold Glider and R-Pilot instruments had significantly higher cyclic fatigue resistance than rotary ProGlider instruments. Clinical relevance This study reported that novel reciprocating glide path instruments exhibited higher cyclic fatigue resistance than rotating glide path instrument.
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cyclic fatigue resistance of r pilot waveone gold glider and proglider glide path instruments
Clinical Oral Investigations, 2018Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:The aim of the present study was to compare the cyclic fatigue resistance of R-Pilot (VDW; Munich, Germany) with ProGlider (Denstply Sirona; Ballaigues, Switzerland) and WaveOne Gold Glider (Denstply Sirona; Ballaigues, Switzerland) glide path instruments. R-Pilot, ProGlider, and WaveOne Gold Glider instruments were collected (n = 15) and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and both time to fracture (TF) and the lengths of the fractured fragments were recorded. Mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data and fractured fragment length data were subjected to one-way ANOVA and post-hoc Tukey Tests (P 0.05). Weibull analysis revealed that WaveOne Gold Glider showed the highest predicted TF value for 99% survival rate, which was followed by R-Pilot and ProGlider. Regarding the length of the fractured tips, there were no significant differences among the instruments (P > 0.05). The reciprocating WaveOne Gold Glider and R-Pilot instruments had significantly higher cyclic fatigue resistance than rotary ProGlider instruments. This study reported that novel reciprocating glide path instruments exhibited higher cyclic fatigue resistance than rotating glide path instrument.
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cyclic fatigue resistance of reciproc blue reciproc and waveone gold reciprocating instruments
Journal of Endodontics, 2017Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:Abstract Introduction The aim of the present study was to compare the cyclic fatigue resistance of Reciproc Blue R25 (VDW, Munich, Germany) with Reciproc R25 (VDW) and WaveOne Gold Primary (Denstply Maillefer, Ballaigues, Switzerland). Methods Fifteen Reciproc Blue R25, 15 Reciproc R25, and 15 WaveOne Gold Primary instruments were collected and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with a 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and time to fracture (TF) and the lengths of the fractured fragments were recorded. The mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data were subjected to Kruskal-Wallis 1-way analysis of variance and the Dunn Test, whereas fractured fragment length data were subjected to 1-way analysis of variance ( P Results Reciproc Blue R25 exhibited the highest cyclic fatigue resistance ( P P P > .05). Conclusions Reciproc Blue R25 instruments had significantly higher cyclic fatigue resistance than WaveOne Gold and Reciproc R25 instruments.
Cangul Keskin - One of the best experts on this subject based on the ideXlab platform.
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Comparison of cyclic fatigue resistance of Rotate instrument with reciprocating and continuous rotary nickel–titanium instruments at body temperature in relation to their transformation temperatures
Clinical Oral Investigations, 2020Co-Authors: Cangul Keskin, Ali Keles, Özlem Sivas Yilmaz, Ugur InanAbstract:Objective The aim of this study was to compare the cyclic fatigue resistance at body temperature and phase transformation behaviors of novel Rotate instrument (25.06) with rotating Mtwo (25.06) and reciprocating Reciproc Blue (25.08) and Reciproc (25.08) instruments. Materials and methods The Rotate, Reciproc Blue, Reciproc, and Mtwo instruments free of visible deformations were collected and Tested in a static cyclic fatigue Test method, which has a ceramic block containing an artificial canal with 60° angle of curvature and a 5-mm radius of curvature at 37 °C ( n = 16). All instruments were operated until fracture occurred, and both time to fracture (TF) and the lengths of the fractured fragments were recorded. TF data was analyzed with one-way ANOVA followed by post hoc Tukey Tests and Weibull analysis, and fractured fragment length data were subjected to one-way ANOVA and post hoc Tukey Tests ( P < 0.05). Two unused instruments from each brand were also subjected to differential scanning calorimetry (DSC) analysis to determine their phase transformation temperatures. Results The Reciproc Blue instruments showed significantly higher TF values and reliability than the other groups ( P < 0.05). Rotate instruments exhibited greater cyclic fatigue resistance than the Reciproc and Mtwo instruments ( P < 0.05). No significant difference was detected among the fractured fragment lengths ( P > 0.05). The lowest austenite finish temperature was exhibited by the Mtwo, which presented a single transformation peak, followed by the Rotate, Reciproc Blue, and Reciproc instruments which all presented two peaks during transformation. Conclusions Cyclic fatigue resistance of instruments manufactured from thermally treated Blue wire instruments was superior to those of the Mtwo and Reciproc, whereas reciprocating the Blue wire showed the highest resistance. Clinical relevance The present study compared the cyclic fatigue resistance of the novel Rotate instrument with similar instruments manufactured from conventional nickel–titanium, m-wire, and Blue wire at body temperature and reported that Blue-treated instruments exhibited superior cyclic fatigue resistance.
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Cyclic fatigue resistance of R-Pilot, WaveOne Gold Glider, and ProGlider glide path instruments
Clinical Oral Investigations, 2018Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:Objective The aim of the present study was to compare the cyclic fatigue resistance of R-Pilot (VDW; Munich, Germany) with ProGlider (Denstply Sirona; Ballaigues, Switzerland) and WaveOne Gold Glider (Denstply Sirona; Ballaigues, Switzerland) glide path instruments. Materials and methods R-Pilot, ProGlider, and WaveOne Gold Glider instruments were collected ( n = 15) and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and both time to fracture (TF) and the lengths of the fractured fragments were recorded. Mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data and fractured fragment length data were subjected to one-way ANOVA and post-hoc Tukey Tests ( P 0.05). Conclusions The reciprocating WaveOne Gold Glider and R-Pilot instruments had significantly higher cyclic fatigue resistance than rotary ProGlider instruments. Clinical relevance This study reported that novel reciprocating glide path instruments exhibited higher cyclic fatigue resistance than rotating glide path instrument.
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cyclic fatigue resistance of r pilot waveone gold glider and proglider glide path instruments
Clinical Oral Investigations, 2018Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:The aim of the present study was to compare the cyclic fatigue resistance of R-Pilot (VDW; Munich, Germany) with ProGlider (Denstply Sirona; Ballaigues, Switzerland) and WaveOne Gold Glider (Denstply Sirona; Ballaigues, Switzerland) glide path instruments. R-Pilot, ProGlider, and WaveOne Gold Glider instruments were collected (n = 15) and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and both time to fracture (TF) and the lengths of the fractured fragments were recorded. Mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data and fractured fragment length data were subjected to one-way ANOVA and post-hoc Tukey Tests (P 0.05). Weibull analysis revealed that WaveOne Gold Glider showed the highest predicted TF value for 99% survival rate, which was followed by R-Pilot and ProGlider. Regarding the length of the fractured tips, there were no significant differences among the instruments (P > 0.05). The reciprocating WaveOne Gold Glider and R-Pilot instruments had significantly higher cyclic fatigue resistance than rotary ProGlider instruments. This study reported that novel reciprocating glide path instruments exhibited higher cyclic fatigue resistance than rotating glide path instrument.
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cyclic fatigue resistance of reciproc blue reciproc and waveone gold reciprocating instruments
Journal of Endodontics, 2017Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:Abstract Introduction The aim of the present study was to compare the cyclic fatigue resistance of Reciproc Blue R25 (VDW, Munich, Germany) with Reciproc R25 (VDW) and WaveOne Gold Primary (Denstply Maillefer, Ballaigues, Switzerland). Methods Fifteen Reciproc Blue R25, 15 Reciproc R25, and 15 WaveOne Gold Primary instruments were collected and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with a 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and time to fracture (TF) and the lengths of the fractured fragments were recorded. The mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data were subjected to Kruskal-Wallis 1-way analysis of variance and the Dunn Test, whereas fractured fragment length data were subjected to 1-way analysis of variance ( P Results Reciproc Blue R25 exhibited the highest cyclic fatigue resistance ( P P P > .05). Conclusions Reciproc Blue R25 instruments had significantly higher cyclic fatigue resistance than WaveOne Gold and Reciproc R25 instruments.
Ugur Inan - One of the best experts on this subject based on the ideXlab platform.
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Comparison of cyclic fatigue resistance of Rotate instrument with reciprocating and continuous rotary nickel–titanium instruments at body temperature in relation to their transformation temperatures
Clinical Oral Investigations, 2020Co-Authors: Cangul Keskin, Ali Keles, Özlem Sivas Yilmaz, Ugur InanAbstract:Objective The aim of this study was to compare the cyclic fatigue resistance at body temperature and phase transformation behaviors of novel Rotate instrument (25.06) with rotating Mtwo (25.06) and reciprocating Reciproc Blue (25.08) and Reciproc (25.08) instruments. Materials and methods The Rotate, Reciproc Blue, Reciproc, and Mtwo instruments free of visible deformations were collected and Tested in a static cyclic fatigue Test method, which has a ceramic block containing an artificial canal with 60° angle of curvature and a 5-mm radius of curvature at 37 °C ( n = 16). All instruments were operated until fracture occurred, and both time to fracture (TF) and the lengths of the fractured fragments were recorded. TF data was analyzed with one-way ANOVA followed by post hoc Tukey Tests and Weibull analysis, and fractured fragment length data were subjected to one-way ANOVA and post hoc Tukey Tests ( P < 0.05). Two unused instruments from each brand were also subjected to differential scanning calorimetry (DSC) analysis to determine their phase transformation temperatures. Results The Reciproc Blue instruments showed significantly higher TF values and reliability than the other groups ( P < 0.05). Rotate instruments exhibited greater cyclic fatigue resistance than the Reciproc and Mtwo instruments ( P < 0.05). No significant difference was detected among the fractured fragment lengths ( P > 0.05). The lowest austenite finish temperature was exhibited by the Mtwo, which presented a single transformation peak, followed by the Rotate, Reciproc Blue, and Reciproc instruments which all presented two peaks during transformation. Conclusions Cyclic fatigue resistance of instruments manufactured from thermally treated Blue wire instruments was superior to those of the Mtwo and Reciproc, whereas reciprocating the Blue wire showed the highest resistance. Clinical relevance The present study compared the cyclic fatigue resistance of the novel Rotate instrument with similar instruments manufactured from conventional nickel–titanium, m-wire, and Blue wire at body temperature and reported that Blue-treated instruments exhibited superior cyclic fatigue resistance.
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Cyclic fatigue resistance of R-Pilot, WaveOne Gold Glider, and ProGlider glide path instruments
Clinical Oral Investigations, 2018Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:Objective The aim of the present study was to compare the cyclic fatigue resistance of R-Pilot (VDW; Munich, Germany) with ProGlider (Denstply Sirona; Ballaigues, Switzerland) and WaveOne Gold Glider (Denstply Sirona; Ballaigues, Switzerland) glide path instruments. Materials and methods R-Pilot, ProGlider, and WaveOne Gold Glider instruments were collected ( n = 15) and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and both time to fracture (TF) and the lengths of the fractured fragments were recorded. Mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data and fractured fragment length data were subjected to one-way ANOVA and post-hoc Tukey Tests ( P 0.05). Conclusions The reciprocating WaveOne Gold Glider and R-Pilot instruments had significantly higher cyclic fatigue resistance than rotary ProGlider instruments. Clinical relevance This study reported that novel reciprocating glide path instruments exhibited higher cyclic fatigue resistance than rotating glide path instrument.
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cyclic fatigue resistance of r pilot waveone gold glider and proglider glide path instruments
Clinical Oral Investigations, 2018Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:The aim of the present study was to compare the cyclic fatigue resistance of R-Pilot (VDW; Munich, Germany) with ProGlider (Denstply Sirona; Ballaigues, Switzerland) and WaveOne Gold Glider (Denstply Sirona; Ballaigues, Switzerland) glide path instruments. R-Pilot, ProGlider, and WaveOne Gold Glider instruments were collected (n = 15) and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and both time to fracture (TF) and the lengths of the fractured fragments were recorded. Mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data and fractured fragment length data were subjected to one-way ANOVA and post-hoc Tukey Tests (P 0.05). Weibull analysis revealed that WaveOne Gold Glider showed the highest predicted TF value for 99% survival rate, which was followed by R-Pilot and ProGlider. Regarding the length of the fractured tips, there were no significant differences among the instruments (P > 0.05). The reciprocating WaveOne Gold Glider and R-Pilot instruments had significantly higher cyclic fatigue resistance than rotary ProGlider instruments. This study reported that novel reciprocating glide path instruments exhibited higher cyclic fatigue resistance than rotating glide path instrument.
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cyclic fatigue resistance of reciproc blue reciproc and waveone gold reciprocating instruments
Journal of Endodontics, 2017Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:Abstract Introduction The aim of the present study was to compare the cyclic fatigue resistance of Reciproc Blue R25 (VDW, Munich, Germany) with Reciproc R25 (VDW) and WaveOne Gold Primary (Denstply Maillefer, Ballaigues, Switzerland). Methods Fifteen Reciproc Blue R25, 15 Reciproc R25, and 15 WaveOne Gold Primary instruments were collected and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with a 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and time to fracture (TF) and the lengths of the fractured fragments were recorded. The mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data were subjected to Kruskal-Wallis 1-way analysis of variance and the Dunn Test, whereas fractured fragment length data were subjected to 1-way analysis of variance ( P Results Reciproc Blue R25 exhibited the highest cyclic fatigue resistance ( P P P > .05). Conclusions Reciproc Blue R25 instruments had significantly higher cyclic fatigue resistance than WaveOne Gold and Reciproc R25 instruments.
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Comparison of cyclic fatigue life of nickel-titanium files: an examination using high-speed camera.
Restorative Dentistry & Endodontics, 2017Co-Authors: Taha Özyürek, Neslihan Büşra Keskin, Fatma Furuncuoğlu, Ugur InanAbstract:OBJECTIVES To determine the actual revolutions per minute (rpm) values and compare the cyclic fatigue life of Reciproc (RPC, VDW GmbH), WaveOne (WO, Dentsply Maillefer), and TF Adaptive (TFA, Axis/SybronEndo) nickel-titanium (NiTi) file systems using high-speed camera. MATERIALS AND METHODS Twenty RPC R25 (25/0.08), 20 WO Primary (25/0.08), and 20 TFA ML 1 (25/0.08) files were employed in the present study. The cyclic fatigue Tests were performed using a dynamic cyclic fatigue Testing device, which has an artificial stainless steel canal with a 60° angle of curvature and a 5-mm radius of curvature. The files were divided into 3 groups (group 1, RPC R25 [RPC]; group 2, WO Primary [WO]; group 3, TF Adaptive ML 1 [TFA]). All the instruments were rotated until fracture during the cyclic fatigue Test and slow-motion videos were captured using high-speed camera. The number of cycles to failure (NCF) was calculated. The data were analyzed statistically using one-way analysis of variance (ANOVA, p < 0.05). RESULTS The slow-motion videos were indicated that rpm values of the RPC, WO, and TFA groups were 180, 210, and 425, respectively. RPC (3,464.45 ± 487.58) and WO (3,257.63 ± 556.39) groups had significantly longer cyclic fatigue life compared with TFA (1,634.46 ± 300.03) group (p < 0.05). There was no significant difference in the mean length of the fractured fragments. CONCLUSIONS Within the limitation of the present study, RPC and WO NiTi files showed significantly longer cyclic fatigue life than TFA NiTi file.
Murat Demiral - One of the best experts on this subject based on the ideXlab platform.
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Cyclic fatigue resistance of R-Pilot, WaveOne Gold Glider, and ProGlider glide path instruments
Clinical Oral Investigations, 2018Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:Objective The aim of the present study was to compare the cyclic fatigue resistance of R-Pilot (VDW; Munich, Germany) with ProGlider (Denstply Sirona; Ballaigues, Switzerland) and WaveOne Gold Glider (Denstply Sirona; Ballaigues, Switzerland) glide path instruments. Materials and methods R-Pilot, ProGlider, and WaveOne Gold Glider instruments were collected ( n = 15) and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and both time to fracture (TF) and the lengths of the fractured fragments were recorded. Mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data and fractured fragment length data were subjected to one-way ANOVA and post-hoc Tukey Tests ( P 0.05). Conclusions The reciprocating WaveOne Gold Glider and R-Pilot instruments had significantly higher cyclic fatigue resistance than rotary ProGlider instruments. Clinical relevance This study reported that novel reciprocating glide path instruments exhibited higher cyclic fatigue resistance than rotating glide path instrument.
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cyclic fatigue resistance of r pilot waveone gold glider and proglider glide path instruments
Clinical Oral Investigations, 2018Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:The aim of the present study was to compare the cyclic fatigue resistance of R-Pilot (VDW; Munich, Germany) with ProGlider (Denstply Sirona; Ballaigues, Switzerland) and WaveOne Gold Glider (Denstply Sirona; Ballaigues, Switzerland) glide path instruments. R-Pilot, ProGlider, and WaveOne Gold Glider instruments were collected (n = 15) and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and both time to fracture (TF) and the lengths of the fractured fragments were recorded. Mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data and fractured fragment length data were subjected to one-way ANOVA and post-hoc Tukey Tests (P 0.05). Weibull analysis revealed that WaveOne Gold Glider showed the highest predicted TF value for 99% survival rate, which was followed by R-Pilot and ProGlider. Regarding the length of the fractured tips, there were no significant differences among the instruments (P > 0.05). The reciprocating WaveOne Gold Glider and R-Pilot instruments had significantly higher cyclic fatigue resistance than rotary ProGlider instruments. This study reported that novel reciprocating glide path instruments exhibited higher cyclic fatigue resistance than rotating glide path instrument.
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cyclic fatigue resistance of reciproc blue reciproc and waveone gold reciprocating instruments
Journal of Endodontics, 2017Co-Authors: Cangul Keskin, Ugur Inan, Murat Demiral, Ali KelesAbstract:Abstract Introduction The aim of the present study was to compare the cyclic fatigue resistance of Reciproc Blue R25 (VDW, Munich, Germany) with Reciproc R25 (VDW) and WaveOne Gold Primary (Denstply Maillefer, Ballaigues, Switzerland). Methods Fifteen Reciproc Blue R25, 15 Reciproc R25, and 15 WaveOne Gold Primary instruments were collected and Tested in a dynamic cyclic fatigue Test device, which has an artificial canal with a 60° angle of curvature and a 5-mm radius of curvature. All instruments were operated until fracture occurred, and time to fracture (TF) and the lengths of the fractured fragments were recorded. The mean and standard deviations of TF and fragment length were calculated for each reciprocating system. TF data were subjected to Kruskal-Wallis 1-way analysis of variance and the Dunn Test, whereas fractured fragment length data were subjected to 1-way analysis of variance ( P Results Reciproc Blue R25 exhibited the highest cyclic fatigue resistance ( P P P > .05). Conclusions Reciproc Blue R25 instruments had significantly higher cyclic fatigue resistance than WaveOne Gold and Reciproc R25 instruments.
Luca Testarelli - One of the best experts on this subject based on the ideXlab platform.
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Fatigue Resistance of Two Nickel-Titanium Rotary Instruments before and after Ex Vivo Root Canal Treatment.
The Journal of Contemporary Dental Practice, 2020Co-Authors: Gabriele Miccoli, Gianluca Gambarini, Marco Seracchiani, Andrea Del Giudice, Alessandro Mazzoni, Maurilio D'angelo, Shilpa Bhandi, Luca TestarelliAbstract:Aim The aim of the present study is twofold: to evaluate cyclic fatigue resistance differences of two different nickel-titanium rotary instruments, brand new and after an ex vivo instrumentation of single root extracted teeth. Materials and methods Twenty new S One 20.06 were randomly divided into two groups. The first group (n = 10) was immediately subjected to a cyclic fatigue Test (S One Group I). The second group (n = 10) (S one Group II) performed a cyclic fatigue Test after three ex vivo root canal treatment with a single-file technique. The same process has been carried out for 20 M-Two 20.06 instruments. Results Mean time to fracture (TtF) for Group I was 51.14 ± 1.28 for S One and 32.62 ± 0.17 for M-Two 20.06 and for Group II was 46.00 ± 0.99 for S One and 27.75 ± 1.58 for M-Two 20.06. The reduction in TtF values from Group I to Group II was 11% for S One and 15% for M-Two. Statistical analysis found significant differences in all the groups examined (p value 0.05). Conclusion The S-One showed significantly more resistance to cyclic fatigue stress than M-Two for both new and used instruments. This validates the hypothesis that the AF H wire enables the S One files to endure more the cyclic fatigue stresses. Clinical significance This study demonstrates the cyclic fatigue resistance of a new endodontic instrument after repetitive usage.
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Fatigue Resistance of New and Used Nickel-Titanium Rotary Instruments: a Comparative Study.
La Clinica terapeutica, 2018Co-Authors: Gianluca Gambarini, Gabriele Miccoli, Marco Seracchiani, Antonio Morese, Lucila Piasecki, Gianfranco Gaimari, Dario Di Nardo, Luca TestarelliAbstract:OBJECTIVES Aim of the present study was twofold. First, to evaluate in vitro, the performance of two different NiTi rotary instruments in one molar case; then, to evaluate their resistance to cyclic fatigue, compared to new ones. MATERIAL AND METHODS 25 ProTaper Next (PTN) nickel-titanium (NiTi) instruments (Maillefer-Dentsply, Baillagues, CH) for each of the following two sizes: X1 (17.04 ) and X2 (25.06) were randomly divided into two groups. The first group (n = 10) immediately under- went to a cyclic fatigue Test. The second group (n = 15) was initially used to prepare 15 extracted molar teeth and then subjected to a cyclic fatigue Test. Same was done for 25 Horizen (HZ) instruments (Kerr Endodontics, Orange, Ca) for each of the following two sizes: 20.04 and 25.06. Instruments were rotated in curved artificial canal until fracture occurred and times to fracture were recorded. All data were collected and statistically analyzed using a variance Test (confidence interval CI = 95%). RESULTS HZ reached working length more rapidly than PTN, and with less deformations. For the fatigue Tests, all the new instruments were significantly more resistant than the used ones. The HZ instru- ments were significantly more resistant in all sizes than PTN, both when new and used instruments were Tested. CONCLUSIONS Since in previous studies ProTaper Next demonstra- ted a better resistance to cyclic fatigue than most of nickel-titanium instruments, Horizen's performance put them in a high rank amongst the most resistant nickel-titanium rotary instruments.
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Influence of file motion on cyclic fatigue of new nickel titanium instruments.
Annali di stomatologia, 2013Co-Authors: Alessio Giansiracusa Rubini, Luca Testarelli, Giancarlo Pongione, Gianpaolo Sannino, Dina Al Sudani, Jeeraphat Jantarat, Massimo De Luca, Gianluca GambariniAbstract:Aim.The aim of the present study was to compare the resistance to cyclic fatigue of Hyflex® (Coltene-Whaledent, Allstatten, Switzerland) size 40 taper.04 nickel titanium instruments used in continuous rotation versus the use with a reciprocating motion. The null hypothesis was that different file motions had no influence on the lifetime of instruments subjected to a cyclic fatigue Test. Methodology.24 Hyflex® size 40 taper.04 nickel titanium instruments were randomly divided in two groups (n=12each), and submitted to a cyclic fatigue Test. The firstgroup (CR group) were used with a continuous rotation,while the second one (RCP group) with a reciprocating motion. The cyclic fatigue Tests were performed by using a stainless steel block containing an artificial canal shaped with a 135° angle. All instruments were rotated or reciprocated until fracture occurred. The time to fracture was recorded visually with a 1/100 second chronometer. Data were recorded and statistically analysed. Results. Results indicated that instruments used with are ciprocating motion showed a significant increase in the meantime to failure when compared to those used in continuous rotation. Conclusions. The null hypothesis was rejected. Results ofthe present study showed that reciprocating motion extended resistance to cyclic fatigue of the Tested nickel titanium instruments, when compared to continuous rotation.
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mechanical properties of nickel titanium rotary instruments produced with a new manufacturing technique
International Endodontic Journal, 2011Co-Authors: Gianluca Gambarini, Dina Alsudani, M Di Luca, Nicola M Grande, Gianluca Plotino, Luca TestarelliAbstract:Gambarini G, Plotino G, Grande NM, Al-Sudani D, De Luca M, Testarelli L. Mechanical properties of nickel–titanium rotary instruments produced with a new manufacturing technique. International Endodontic Journal. Aim To investigate whether flexibility and cyclic fatigue resistance was increased for nickel–titanium instruments produced by a new manufacturing technique. Methodology Forty K3 tip size 25, 0.06 taper (SybronEndo) nickel–titanium rotary instruments were randomly selected and divided into two groups (n = 20). One group served as control, being the commercially available instruments produced with a traditional grinding process (K3). The second group of instruments (K4 prototypes) were then subjected to a proprietary thermal treatment after the grinding process. Finally, each group was randomly divided into two subgroups of 10 instruments each, to perform the stiffness Test and the cyclic fatigue Test. All data were recorded and subjected to statistical evaluation using Student’s t-Test. Significance was set at the 95% confidence level. Results For the stiffness Test, a statistically significant difference (P < 0.05) was noted between K3 and K4 prototype instruments. K4 prototype instruments were significantly more flexible when compared to K3 instruments (59.3 ± 4.3 vs. 98.1 ± 6.4 g cm )1 ). For the cyclic fatigue Test, a significant difference (P < 0.05) was noted between K3 and K4 prototype instruments. K4 prototype instruments demonstrated a significant increase in the mean number of cycles to failure (NCF) when compared to K3 instruments (1198 ± 279 vs. 542 ± 81 NCF). Conclusions The new manufacturing technique resulted in the K4 prototype instruments having enhanced mechanical properties, compared to K3 instruments, manufactured with a traditional grinding process.
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The effect of brushing motion on the cyclic fatigue of rotary nickel titanium instruments
Annali dell'Istituto superiore di sanita, 2010Co-Authors: Gianluca Gambarini, Valerio Milana, Massimo De Luca, E. Tucci, Rossella Bedini, Raffaella Pecci, Massimo Galli, Luca TestarelliAbstract:The goal of the study is to evaluate if the use of rotary nickel-titanium (RNT) instruments, as Hedstroem files, is safe. Twelve twisted files (TF) RNT instruments size 06-25 were selected and randomly divided in 2 groups of 6 instruments each. Group A (new instruments) were used as control. Group B (Test) instruments were clinically used only as Hedstroem files in a canal that had been previously instrumented to the working length with other 06-25 RNT instruments. Group B instruments were used only in the straight portion of the canal (1 minute at 1000 rpm). A cyclic fatigue Test was performed for each instrument of groups. Data were statistically analyzed (Student's t-Test). Results showed no significant difference (P > 0.05) between groups A and B. Data confirmed that the use of TF instruments as Hedstroem files is a safe procedure. Cross section images and volumes of the same instrument, before and after cyclic fatigue Testing, have been obtained by means of microtomographic analysis to evaluate possible microstructure alterations.
