Restor Dent Endod.  2017 Feb;42(1):34-38. 10.5395/rde.2017.42.1.34.

Effect of adaptive motion on cyclic fatigue resistance of a nickel titanium instrument designed for retreatment

• Özyürek
• Yılmaz K
• Uslu G

• KMID: 2367319
• DOI: http://doi.org/10.5395/rde.2017.42.1.34

Abstract

OBJECTIVES
The aim of this study was to evaluate the cyclic fatigue resistance of the ProTaper Universal D1 file (Dentsply Maillefer) under continuous and adaptive motion.
MATERIALS AND METHODS
Forty ProTaper Universal D1 files were included in this study. The cyclic fatigue tests were performed using a dynamic cyclic fatigue testing device, which had an artificial stainless steel canal with a 60° angle of curvature and a 5 mm radius of curvature. The files were randomly divided into two groups (Group 1, Rotary motion; Group 2, Adaptive motion). The time to failure of the files were recorded in seconds. The number of cycles to failure (NCF) was calculated for each group. The data were statistically analyzed using Student's t-test. The statistical significant level was set at p < 0.05.
RESULTS
The cyclic fatigue resistance of the adaptive motion group was significantly higher than the rotary motion group (p < 0.05).
CONCLUSION
Within the limitations of the present study, the "˜Adaptive motion' significantly increased the resistance of the ProTaper Universal D1 file to cyclic facture.

Keyword

Cyclic fatigue; Dynamic model; Endodontics; Nickel titanium; ProTaper Universal Retreatment

MeSH Terms

Endodontics
Fatigue*
Nickel*
Radius
Retreatment*
Stainless Steel
Titanium*
Nickel
Stainless Steel
Titanium

Figure

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  Figure 1 Dynamic cyclic fatigue testing device.

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  Figure 2 SEM appearances of the ProTaper Universal retreatment D1 files after cyclic fatigue testing. (a) and (c) General view of D1 instrument with fatigue zones, and an overload fast fracture zone (white arrows); (b) and (d) High-magnification view of D1 instrument showing fatigue striations typical of cyclic fatigue (white arrows). (a) and (b) Rotary motion group; (c) and (d) Adaptive motion group.

Reference

1. Pruett JP, Clement DJ, Carnes DL Jr. Cyclic fatigue testing of nickel-titanium endodontic instruments. J Endod. 1997; 23:77–85.

2. Arens FC, Hoen MM, Steiman HR, Dietz GC Jr. Evaluation of single-use rotary nickel-titanium instruments. J Endod. 2003; 29:664–666.

3. Berutti E, Chiandussi G, Paolino DS, Scotti N, Cantatore G, Castellucci A, Pasqualini D. Canal shaping with WaveOne Primary reciprocating files and ProTaper system: a comparative study. J Endod. 2012; 38:505–509.

4. Gambarini G, Testarelli L, De Luca M, Milana V, Plotino G, Grande NM, Rubini AG, Al Sudani D, Sannino G. The influence of three different instrumentation techniques on the incidence of postoperative pain after endodontic treatment. Ann Stomatol (Roma). 2013; 4:152–155.

5. Giuliani V, Cocchetti R, Pagavino G. Efficacy of ProTaper universal retreatment files in removing filling materials during root canal retreatment. J Endod. 2008; 34:1381–1384.

6. Gambarini G, Glassman G. In vitro analysis of efficiency and safety of a new motion for endodontic instrumentation: TF Adaptive. Roots. 2013; 3:12–15.

7. Higuera O, Plotino G, Tocci L, Carrillo G, Gambarini G, Jaramillo DE. Cyclic fatigue resistance of 3 different nickel-titanium reciprocating instruments in artificial canals. J Endod. 2015; 41:913–915.

8. Li UM, Lee BS, Shih CT, Lan WH, Lin CP. Cyclic fatigue of endodontic nickel titanium rotary instruments: static and dynamic tests. J Endod. 2002; 28:448–451.

9. Lopes HP, Britto IM, Elias CN, Machado de Oliveira JC, Neves MA, Moreira EJ, Siqueira JF Jr. Cyclic fatigue resistance of ProTaper Universal instruments when subjected to static and dynamic tests. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010; 110:401–404.

10. Lopes HP, Elias CN, Vieira MV, Siqueira JF Jr, Mangelli M, Lopes WS, Vieira VT, Alves FR, Oliveira JC, Soares TG. Fatigue life of Reciproc and Mtwo instruments subjected to static and dynamic tests. J Endod. 2013; 39:693–696.

11. Rodrigues RC, Lopes HP, Elias CN, Amaral G, Vieira VT, De Martin AS. Influence of different manufacturing methods on the cyclic fatigue of rotary nickel-titanium endodontic instruments. J Endod. 2011; 37:1553–1557.

12. Elnaghy AM, Elsaka SE. Torsion and bending properties of OneShape and WaveOne instruments. J Endod. 2015; 41:544–547.

13. Pedullà E, Lo Savio F, Boninelli S, Plotino G, Grande NM, La Rosa G, Rapisarda E. Torsional and cyclic fatigue resistance of a new nickel-titanium instrument manufactured by electrical discharge machining. J Endod. 2016; 42:156–159.

14. Topçuoğlu HS, Topçuoğlu G, Aktı A. Comparative evaluation of cyclic fatigue resistance of D‐RaCe and ProTaper retreatment instruments in curved artificial canals. Int Endod J. 2016; 49:604–609.

15. Inan U, Aydin C. Comparison of cyclic fatigue resistance of three different rotary nickel-titanium instruments designed for retreatment. J Endod. 2012; 38:108–111.

16. Hussne RP, Braga LC, Berbert FL, Buono VT, Bahia MG. Flexibility and torsional resistance of three nickel-titanium retreatment instrument systems. Int Endod J. 2011; 44:731–738.

17. Gambarini G, Gergi R, Naaman A, Osta N, Al Sudani D. Cyclic fatigue analysis of twisted file rotary NiTi instruments used in reciprocating motion. Int Endod J. 2012; 45:802–806.

18. Gavini G, Caldeira CL, Akisue E, Candeiro GT, Kawakami DA. Resistance to flexural fatigue of Reciproc R25 files under continuous rotation and reciprocating movement. J Endod. 2012; 38:684–687.

19. Shin CS, Huang YH, Chi CW, Lin CP. Fatigue life enhancement of NiTi rotary endodontic instruments by progressive reciprocating operation. Int Endod J. 2014; 47:882–888.

20. Gambarini G, Rubini AG, Al Sudani D, Gergi R, Culla A, De Angelis F, Di Carlo S, Pompa G, Osta N, Testarelli L. Influence of different angles of reciprocation on the cyclic fatigue of nickel-titanium endodontic instruments. J Endod. 2012; 38:1408–1411.

21. De‐Deus G, Moreira EJ, Lopes HP, Elias CN. Extended cyclic fatigue life of F2 ProTaper instruments used in reciprocating movement. Int Endod J. 2010; 43:1063–1068.