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ENDO - Endodontic Practice Today

Edited by Bun San Chong and Edgar Schäfer

Official Publication of the Belgian Association for Endodontology and Traumatology (BAET) and the French Society of Endodontics (SFE)

ISSN (print) 1753-2809 • ISSN (online) 1753-2817


Fall 2013
Volume 7 , Issue 3

Pages: 217-222
Share Abstract:

Fatigue life of WaveOne and ProTaper instruments operated in reciprocating or continuous rotation movements and subjected to dynamic and static tests

Lopes, Hélio P. / Elias, Carlos N. / Siqueira Jr, José F. / Mangelli, Marcelo / Lopes, Weber S.P. / Vieira, Victor T.L. / Roca, Edilene Andrade

Objectives: This study evaluated the influence of reciprocating movement on the fatigue life of root canal instruments subjected to static and dynamic tests.
Materials and methods: The rotary NiTi instruments used in this study were WaveOne and ProTaper F2 (both from Dentsply Maillefer, Ballaigues, Switzerland). The instruments were initially subjected to a cantilever-bending test, then to static and dynamic fatigue tests. WaveOne instruments were operated in reciprocating movement and ProTaper in continuous rotation.
Results: The mean bending resistance values (maximum load in grams) of the instruments were as follows: WaveOne = 544.8; ProTaper F2 = 555.4. No significant difference was observed between the instruments tested (P > 0.05). The mean time to fracture (in seconds) of the instruments subjected to static and dynamic tests were as follows: WaveOne = 93.5 (static) and 267.6 (dynamic); ProTaper F2 = 57.8 (static) and 94.1 (dynamic). Student’s t test revealed significant differences in all tests (P < 0.05).
Conclusion: The findings revealed that instruments operated in a reciprocating movement and in the dynamic testing model presented prolonged fatigue life.

Keywords: dynamic test, fatigue fracture, fatigue resistance, flexibility, reciprocating movement

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