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). Mean fragment length (FL) for Group I was 3.07 ± 0.17 for S One and 3.05 ± 0.14 for M-Two 20.06 and for Group II was 3.05 ± 0.07 for S One and 3.05 ± 0.14 for M-Two 20.06. Statistical analysis was pursued, and no significant difference was found (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.

Fatigue resistance of two Nickel-Titanium rotary instruments before and after ex vivo root canal treatment / Miccoli, G.; Seracchiani, M.; Del Giudice, A.; Mazzoni, A.; D'Angelo, M.; Bhandi, S.; Gambarini, G.; Testarelli, L.. - In: JOURNAL OF CONTEMPORARY DENTAL PRACTICE. - ISSN 1526-3711. - 21:7(2020), pp. 728-732. [10.5005/jp-journals-10024-2875]

Fatigue resistance of two Nickel-Titanium rotary instruments before and after ex vivo root canal treatment

Miccoli G.
Primo
Methodology
;
Seracchiani M.
Secondo
Validation
;
D'Angelo M.;Gambarini G.
Penultimo
Membro del Collaboration Group
;
Testarelli L.
Ultimo
Conceptualization
2020

Abstract

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). Mean fragment length (FL) for Group I was 3.07 ± 0.17 for S One and 3.05 ± 0.14 for M-Two 20.06 and for Group II was 3.05 ± 0.07 for S One and 3.05 ± 0.14 for M-Two 20.06. Statistical analysis was pursued, and no significant difference was found (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.
2020
cyclic fatigue; endodontics; heat treatment; NiTi rotary instrument
01 Pubblicazione su rivista::01a Articolo in rivista
Fatigue resistance of two Nickel-Titanium rotary instruments before and after ex vivo root canal treatment / Miccoli, G.; Seracchiani, M.; Del Giudice, A.; Mazzoni, A.; D'Angelo, M.; Bhandi, S.; Gambarini, G.; Testarelli, L.. - In: JOURNAL OF CONTEMPORARY DENTAL PRACTICE. - ISSN 1526-3711. - 21:7(2020), pp. 728-732. [10.5005/jp-journals-10024-2875]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1437747
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