Fatigue life enhancement of NiTi rotary endodontic instruments by progressive reciprocating operation

International Endodontic Journal
C S ShinC P Lin

Abstract

To evaluate the effect of reciprocating amplitude and progressive angular increment on fatigue life enhancement of NiTi rotary endodontic instruments. ProTaper F2 instruments were operated in steel artificial canals with both stationary reciprocating (SR) and progressive reciprocating (PR) motions. The SR motions involved symmetric to and fro reciprocation of ± 180(o) , ± 135(o) , ± 90(o) , ± 60(o) and ± 45(o) . The PR motions were ± 45(o) stationary motion superimposed with angular increments of 7(o) , 11(o) , 22.5(o) or 31(o) whenever an instrument completed 1, 10 or 30 reciprocating cycles (rc). The fatigue lives were compared with those under continuous rotation (CR) and a reciprocating operation with a forward 144(o) and backward 72(o) motion proposed by Yared (2008). The statistical significance of these operating modes on fatigue life was examined using one way anova and post hoc Tukey's tests at P = 0.05. Fractographic analysis was also applied to probe the fracture mechanisms of different rotation motions. Fatigue life increased with decreasing reciprocating amplitude. Operating in the SR increased fatigue life by 355% over that in the CR. Except for the 22.5(o) increment, all PR motions yielded longer fatigue lives th...Continue Reading

References

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Apr 25, 2013·Journal of Endodontics·Hélio P LopesThaiane G Soares

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Citations

Jan 30, 2015·International Endodontic Journal·I D Çapar, H Arslan
Mar 31, 2015·International Endodontic Journal·E KarataşI D Çapar
Aug 10, 2016·Journal of the Formosan Medical Association = Taiwan Yi Zhi·Chih-Wen ChiChun-Pin Lin
Aug 25, 2016·Journal of Applied Oral Science : Revista FOB·Rafael Rodrigues Soares de MagalhãesMaria Guiomar de Azevedo Bahia
Feb 15, 2017·Restorative Dentistry & Endodontics·Taha ÖzyürekGülşah Uslu
Aug 17, 2018·Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc·Gianluca GambariniLuca Testarelli
Aug 16, 2017·Restorative Dentistry & Endodontics·Taha ÖzyürekUğur İnan
Oct 27, 2018·Brazilian Oral Research·Carlos José SoaresAntheunis Versluis
Nov 7, 2018·Clinical Oral Investigations·Francesco IaconoCarlo Prati
Apr 30, 2021·Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc·Giulio GaviniMarco Antonio Húngaro Duarte

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