Aim. The aim of this study was to evaluate, in vitro cyclic fatigue of Ni-Ti rotary instruments through the use of an experimental model. Methods.The Ni-Ti rotary instruments evaluated were 18 ProFile 25/.06 (Maillefer-Tulsa, USA), 18 K3 25/.06 (Sybron Endo, Orange), 18 Twisted File 25/.06 (Sybron Endo, Orange). The analysis of resistance to cyclic fatigue was performed using an experimental model with angles of 45 °, 60 ° and 90 °. Finally an endodontic handpiece VDW Gold Series (Dentsply, Italy) was fixed in a vise. The working parts of the instrument, equal to 16 mm, was inserted into the hollow cylinder with a length of 9 mm, measured using a caliper. In order to estimate the time of fracture was filmed using a Sony Full HD (1080) 10.2 megapixels. The statistical test was conducted using ANOVA and t-student to analyze two groups of instruments at the same angle. Null hypothesis (H0): The three different types of Ni-Ti have the same resistance to cyclic fatigue flexor. Alternative hypothesis (Ha): At least one of the three instruments is resistant to cyclic fatigue flexor than that of others. The significance of both tests has been put at 5% (p ≤ 0.05). Results. Twisted File and ProFile to 45 ° and 60 ° showed a highly significant resistance to cyclic fatigue (p <0.0001) compared to the systematic K3. Between ProFile and K3 no statistically significant difference was showed by 90°(P> 0.05), but the systematic Twisted File was statistically significant compared to the other two (p <0.0001). Conclusions. The statistical analysis showed a good resistance to cyclic fatigue with regard to systematic ProFile and Twisted File, by contrast, the systematic K3 was found to be less than 45 °, 60 ° and 90 °.

Cusimano, ., E., C., Grandini, S., Ferrari, M., G., G. (2011). In vitro evaluation of cyclic fatigue of rotary Ni-Ti instruments. In Atti del Congresso del collegio dei docenti di discipline odontostomatologiche. Siena-Firenze 14-16 Aprile 2011.

In vitro evaluation of cyclic fatigue of rotary Ni-Ti instruments

GRANDINI, SIMONE;FERRARI, MARCO;
2011-01-01

Abstract

Aim. The aim of this study was to evaluate, in vitro cyclic fatigue of Ni-Ti rotary instruments through the use of an experimental model. Methods.The Ni-Ti rotary instruments evaluated were 18 ProFile 25/.06 (Maillefer-Tulsa, USA), 18 K3 25/.06 (Sybron Endo, Orange), 18 Twisted File 25/.06 (Sybron Endo, Orange). The analysis of resistance to cyclic fatigue was performed using an experimental model with angles of 45 °, 60 ° and 90 °. Finally an endodontic handpiece VDW Gold Series (Dentsply, Italy) was fixed in a vise. The working parts of the instrument, equal to 16 mm, was inserted into the hollow cylinder with a length of 9 mm, measured using a caliper. In order to estimate the time of fracture was filmed using a Sony Full HD (1080) 10.2 megapixels. The statistical test was conducted using ANOVA and t-student to analyze two groups of instruments at the same angle. Null hypothesis (H0): The three different types of Ni-Ti have the same resistance to cyclic fatigue flexor. Alternative hypothesis (Ha): At least one of the three instruments is resistant to cyclic fatigue flexor than that of others. The significance of both tests has been put at 5% (p ≤ 0.05). Results. Twisted File and ProFile to 45 ° and 60 ° showed a highly significant resistance to cyclic fatigue (p <0.0001) compared to the systematic K3. Between ProFile and K3 no statistically significant difference was showed by 90°(P> 0.05), but the systematic Twisted File was statistically significant compared to the other two (p <0.0001). Conclusions. The statistical analysis showed a good resistance to cyclic fatigue with regard to systematic ProFile and Twisted File, by contrast, the systematic K3 was found to be less than 45 °, 60 ° and 90 °.
2011
Cusimano, ., E., C., Grandini, S., Ferrari, M., G., G. (2011). In vitro evaluation of cyclic fatigue of rotary Ni-Ti instruments. In Atti del Congresso del collegio dei docenti di discipline odontostomatologiche. Siena-Firenze 14-16 Aprile 2011.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/36773
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