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Cyclic and torsional fatigue resistance of two replicalike and original brand reciprocating system
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The aim of this study was to evaluate the cyclic and torsional fatigue resistance of two replicalike in comparison of the original brand reciprocating system. Material and methods: A total of 60 reciprocating instruments were used to perform the cyclic and torsional fatigue test of following systems: Reciproc Blue 25.08 (RB 25.08), Only One File Blue (OFB 25.08) and RC Blue 25.08 (RCB 25.08) (n=20). The cyclic fatigue test was performed using an artificial stainless steel canal with 60º angle of curvature and a 5-mm radius of curvature. The instruments were activated until failure occurred. The time to failure (TF) and number of Cycles to failure (NCF) were evaluated. The torsional test was performed following the ISO 3630-1. Three millimeters of the instrument tip was fastened to a small load cell and the maximum torsional strength and angular deflection were recorded using the torsion testing machine software. The fractured surface of each instrument was assessed by scanning electron microscopy (SEM). The data were analyzed using one-way analysis of variance ANOVA and Tukey’s test for Multiple comparisons at a significance level of 5%. Results: The cyclic fatigue tests demonstrated that OFB 25.08 had the highest TF and NCF than among the groups (P<0.05). RCB 25.08 exhibited lowest TF and NCF (P>0.05). Regarding the torsional test, the RCB 25.08 and OFB 25.08 had the highest torque than the other groups (P<0.05). Additionally, RB 25.08 and OFB 25.08 exhibited highest angular deflection values than the other groups (P><0.05). Conclusion: The OFB 25.08 demonstrated highest TF and NCF than the instruments tested. The RCB 25.08 exhibited lowest cyclic fatigue resistance and angular deflection.> P<0.05). RCB 25.08 exhibited lowest TF and NCF (P>0.05). Regarding the torsional test, the RCB 25.08 and OFB 25.08 had the highest torque than the other groups (P<0.05). Additionally, RB 25.08 and OFB 25.08 exhibited highest angular deflection values than the other groups (P><0.05). Conclusion: The OFB 25.08 demonstrated highest TF and NCF than the instruments tested. The RCB 25.08 exhibited lowest cyclic fatigue resistance and angular deflection.> P<0.05). Conclusion: The OFB 25.08 demonstrated highest TF and NCF than the instruments tested. The RCB 25.08 exhibited lowest cyclic fatigue resistance and angular deflection.
Fundacao Educacional da Regiao de Joinville - Univille
Title: Cyclic and torsional fatigue resistance of two replicalike and original brand reciprocating system
Description:
The aim of this study was to evaluate the cyclic and torsional fatigue resistance of two replicalike in comparison of the original brand reciprocating system.
Material and methods: A total of 60 reciprocating instruments were used to perform the cyclic and torsional fatigue test of following systems: Reciproc Blue 25.
08 (RB 25.
08), Only One File Blue (OFB 25.
08) and RC Blue 25.
08 (RCB 25.
08) (n=20).
The cyclic fatigue test was performed using an artificial stainless steel canal with 60º angle of curvature and a 5-mm radius of curvature.
The instruments were activated until failure occurred.
The time to failure (TF) and number of Cycles to failure (NCF) were evaluated.
The torsional test was performed following the ISO 3630-1.
Three millimeters of the instrument tip was fastened to a small load cell and the maximum torsional strength and angular deflection were recorded using the torsion testing machine software.
The fractured surface of each instrument was assessed by scanning electron microscopy (SEM).
The data were analyzed using one-way analysis of variance ANOVA and Tukey’s test for Multiple comparisons at a significance level of 5%.
Results: The cyclic fatigue tests demonstrated that OFB 25.
08 had the highest TF and NCF than among the groups (P<0.
05).
RCB 25.
08 exhibited lowest TF and NCF (P>0.
05).
Regarding the torsional test, the RCB 25.
08 and OFB 25.
08 had the highest torque than the other groups (P<0.
05).
Additionally, RB 25.
08 and OFB 25.
08 exhibited highest angular deflection values than the other groups (P><0.
05).
Conclusion: The OFB 25.
08 demonstrated highest TF and NCF than the instruments tested.
The RCB 25.
08 exhibited lowest cyclic fatigue resistance and angular deflection.
> P<0.
05).
RCB 25.
08 exhibited lowest TF and NCF (P>0.
05).
Regarding the torsional test, the RCB 25.
08 and OFB 25.
08 had the highest torque than the other groups (P<0.
05).
Additionally, RB 25.
08 and OFB 25.
08 exhibited highest angular deflection values than the other groups (P><0.
05).
Conclusion: The OFB 25.
08 demonstrated highest TF and NCF than the instruments tested.
The RCB 25.
08 exhibited lowest cyclic fatigue resistance and angular deflection.
> P<0.
05).
Conclusion: The OFB 25.
08 demonstrated highest TF and NCF than the instruments tested.
The RCB 25.
08 exhibited lowest cyclic fatigue resistance and angular deflection.
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