CYCLIC FATIGUE RESISTANCE AND FRACTOGRAPHIC ANALYSIS OF RACE AND PROTAPER ROTARY NITI INSTRUMENTS

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AZIMI SHAHRAM; DELVARI PARISA; HAJARIAN HAMID CYRUS; SAGHIRI MOHAMMAD ALI; KARAMIFAR KASRA; LOTFI MEHRDAD

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Journal: Iranian Endodontic Journal Year:2011 | Volume:6 | Issue:2 Page(s): 80-86

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Title

CYCLIC FATIGUE RESISTANCE AND FRACTOGRAPHIC ANALYSIS OF RACE AND PROTAPER ROTARY NITI INSTRUMENTS

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Keywords

FRACTOGRAPHIC ANALYSIS

CYCLIC FATIGUE

TORSIONAL FAILURE

ROTARY NITI INSTRUMENT

Abstract

INTRODUCTION: This study investigated the fatigue and fracture modes of RaCe and ProTaper rotary instruments.MATERIALS & METHODS: Fatigue resistance was evaluated by rotating the files 30o or 60o and with 2 or 5mm radius of curvature. RaCe taper 06 size 25 and ProTaper F1 files (n=40) were used. The number of rotations to failure was analyzed by two-way ANOVA and independent sample t-test. Fracture surfaces were examined under a scanning electron microscope.RESULTS: Both files exhibited significantly more resistance to fracture when angle severity was reduced and increase in curvature radius (P=0.000). ProTaper demonstrated higher number of cycle of failure (P=0.0029) in one group (r=5mm, 60o). SEM observation revealed fatigue mark/features in 17 specimens, shear characteristics in 37 samples, and tensile overload in 26 samples.CONCLUSION: Radius of curvature was the main factor in torsional and fatigue failures.

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APA: Copy

AZIMI, SHAHRAM, DELVARI, PARISA, HAJARIAN, HAMID CYRUS, SAGHIRI, MOHAMMAD ALI, KARAMIFAR, KASRA, & LOTFI, MEHRDAD. (2011). CYCLIC FATIGUE RESISTANCE AND FRACTOGRAPHIC ANALYSIS OF RACE AND PROTAPER ROTARY NITI INSTRUMENTS. IRANIAN ENDODONTIC JOURNAL (IEJ), 6(2), 80-86. SID. https://sid.ir/paper/302753/en

Vancouver: Copy

AZIMI SHAHRAM, DELVARI PARISA, HAJARIAN HAMID CYRUS, SAGHIRI MOHAMMAD ALI, KARAMIFAR KASRA, LOTFI MEHRDAD. CYCLIC FATIGUE RESISTANCE AND FRACTOGRAPHIC ANALYSIS OF RACE AND PROTAPER ROTARY NITI INSTRUMENTS. IRANIAN ENDODONTIC JOURNAL (IEJ)[Internet]. 2011;6(2):80-86. Available from: https://sid.ir/paper/302753/en

IEEE: Copy

SHAHRAM AZIMI, PARISA DELVARI, HAMID CYRUS HAJARIAN, MOHAMMAD ALI SAGHIRI, KASRA KARAMIFAR, and MEHRDAD LOTFI, “CYCLIC FATIGUE RESISTANCE AND FRACTOGRAPHIC ANALYSIS OF RACE AND PROTAPER ROTARY NITI INSTRUMENTS,” IRANIAN ENDODONTIC JOURNAL (IEJ), vol. 6, no. 2, pp. 80–86, 2011, [Online]. Available: https://sid.ir/paper/302753/en

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