Evaluation of deformation and fracture rates for nickel-titanium rotary instruments according to the frequency of clinical use
DOI: 10.26650/eor.2018.461Purpose
To evaluate the deformation and fracture
rates for ProTaper Universal (PTU) nickel-titanium rotary instruments according
to the frequency of clinical use.
Materials and Methods
A total of 619 PTU instruments (S1, S2, F1,
F2, and F3) that have been used in the clinic by a single endodontist were
collected over a period of 4 years. These instruments were grouped on the basis
of one to three (Group A), four to six (Group B) and seven to nine (Group C)
clinical uses (one canal = one use). All instruments were evaluated by a
blinded investigator under a stereomicroscope at 15×–45× magnification for the
presence of deformation and fracture.
Results
The overall rates of deformation and
fracture were 10% and 1.2%, respectively. The deformation and fracture rates
for the S2, F1, and F2 instruments showed no significant differences among
groups. However, fracture rate for S1 instruments in Group A was significantly
higher than for those in Group B (p=0.025) and Group C (p=0.004). In Group C,
the S1 instruments showed a significantly higher deformation rate compared with
the S2 (p=0.04), F1 (p=0.008) and F2 (p=0.049) instruments; there were no other
significant differences within groups.
Conclusion
Under the conditions of the current study,
frequency of use seemed to influence the deformation rates of PTU rotary
instruments. Except S1, these instruments could be used without any fracture or
deformation in up to 9 clinical cases by an experienced endodontist.
___
- 1. Pruett JP, Clement DJ, Carnes DL, Jr. Cyclic fatigue testing of nickel-titanium endodontic instruments. J Endod 1997; 23: 77-85. 2. Shen Y, Peng B, Cheung GS. Factors associated with the removal of fractured niti instruments from root canal systems. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2004; 98: 605-10. 3. Sattapan B, Nervo GJ, Palamara JE, Messer HH. Defects in rotary nickel-titanium files after clinical use. J Endod 2000; 26: 161-5. 4. Shen Y, Cheung GS, Bian Z, Peng B. Comparison of defects in profile and protaper systems after clinical use. J Endod 2006; 32: 61-5. 5. Shen Y, Haapasalo M, Cheung GS, Peng B. Defects in nickel-titanium instruments after clinical use. Part 1: Relationship between observed imperfections and factors leading to such defects in a cohort study. J Endod 2009; 35: 129-32. 6. Vieira EP, Franca EC, Martins RC, Buono VT, Bahia MG. Influence of multiple clinical use on fatigue resistance of protaper rotary nickel-titanium instruments. Int Endod J 2008; 41: 163-72. 7. Gambarini G. Cyclic fatigue of profile rotary instruments after prolonged clinical use. Int Endod J 2001; 34: 386-9. 8. Peters OA, Barbakow F. Dynamic torque and apical forces of profile.04 rotary instruments during preparation of curved canals. Int Endod J 2002; 35: 379-89. 9. Wolcott S, Wolcott J, Ishley D, Kennedy W, Johnson S, Minnich S, Meyers J. Separation incidence of protaper rotary instruments: A large cohort clinical evaluation. J Endod 2006; 32: 1139-41. 10. Yared GM, Bou Dagher FE, Machtou P. Cyclic fatigue of profile rotary instruments after clinical use. Int Endod J 2000; 33: 204-7. 11. Yared GM, Dagher FE, Machtou P, Kulkarni GK. Influence of rotational speed, torque and operator proficiency on failure of greater taper files. Int Endod J 2002; 35: 7-12. 12. Hargreaves KM, Berman LH. Pathways of the pulp. 11th ed. Missouri, USA: Elsevier 2016, p.209-279. 13. Martin B, Zelada G, Varela P, Bahillo JG, Magan F, Ahn S, Rodriguez C. Factors influencing the fracture of nickel-titanium rotary instruments. Int Endod J 2003; 36: 262-6. 14. Zelada G, Varela P, Martin B, Bahillo JG, Magan F, Ahn S. The effect of rotational speed and the curvature of root canals on the breakage of rotary endodontic instruments. J Endod 2002; 28: 540-2. 15. Parashos P, Gordon I, Messer HH. Factors influencing defects of rotary nickel-titanium endodontic instruments after clinical use. J Endod 2004; 30: 722-5. 16. Ullmann CJ, Peters OA. Effect of cyclic fatigue on static fracture loads in protaper nickel-titanium rotary instruments. J Endod 2005; 31: 183-6. 17. Wu J, Lei G, Yan M, Yu Y, Yu J, Zhang G. Instrument separation analysis of multi-used protaper universal rotary system during root canal therapy. J Endod 2011; 37: 758-63. 18. Wei X, Ling J, Jiang J, Huang X, Liu L. Modes of failure of protaper nickel-titanium rotary instruments after clinical use. J Endod 2007; 33: 276-9. 19. Shen Y, Coil JM, McLean AG, Hemerling DL, Haapasalo M. Defects in nickel-titanium instruments after clinical use. Part 5: Single use from endodontic specialty practices. J Endod 2009; 35: 1363-7. 20. Gambarini G. Rationale for the use of low-torque endodontic motors in root canal instrumentation. Endod Dent Traumatol 2000; 16: 95-100. 21. Yared GM, Bou Dagher FE, Machtou P. Failure of profile instruments used with high and low torque motors. Int Endod J 2001; 34: 471-5. 22. Bortnick KL, Steiman HR, Ruskin A. Comparison of nickel-titanium file distortion using electric and air-driven handpieces. J Endod 2001; 27: 57-9. 23. Valois CR, Silva LP, Azevedo RB. Multiple autoclave cycles affect the surface of rotary nickel-titanium files: An atomic force microscopy study. J Endod 2008; 34: 859-62. 24. Hilt BR, Cunningham CJ, Shen C, Richards N. Torsional properties of stainless-steel and nickel-titanium files after multiple autoclave sterilizations. J Endod 2000; 26: 76-80. 25. Regan JD, Sherriff M, Meredith N, Gulabivala K. A survey of interfacial forces used during filing of root canals. Endod Dent Traumatol 2000; 16: 101-6. 26. Sonntag D, Delschen S, Stachniss V. Root-canal shaping with manual and rotary ni-ti files performed by students. Int Endod J 2003; 36: 715-23. 27. Yared GM, Bou Dagher FE, Machtou P. Cyclic fatigue of profile rotary instruments after simulated clinical use. Int Endod J 1999; 32: 115-9.
- ISSN: 2630-6158
- Yayın Aralığı: Yılda 3 Sayı
- Başlangıç: 1967
- Yayıncı: İstanbul Üniversitesi
Sayıdaki Diğer Makaleler
Uğur AYDIN, Fatih AKSOY, Samet TOSUN
Mehmet Ali ALTAY, Faisal A. QUERESHY, Sumit K. NİJHAWAN, Jose F. TEPPA, Michael P. HORAN, Nelli YILDIRIMYAN, Dale A. BAUR
Ayça YILMAZ, Sıtkı Selçuk GÖKYAY, Rüştü DAĞLAROĞLU, İşıl KARAGÖZ KÜÇÜKAY
Gökhan GÜRLER, Nevin KAPTAN AKAR, Çağrı DELİLBAŞI, İpek KAÇAR
Mustafa GÜNDOĞAR, Güzide Pelin SEZGİN, Erhan ERKAN, Özgün Yusuf ÖZYILMAZ
Nisa Gül AMUK, Aslı BAYSAL, Yakup ÜSTÜN, Gökmen KURT
İsmail Hakkı BALTACIOĞLU, Gülbike DEMİREL, Mehmet Eray KOLSUZ, Kaan ORHAN
Nihal Berke BULUT, Gülümser EVLİOĞLU, Bilge Gökçen RÖHLİG, Tamer ÇELAKIL
Mine KOYUNCU, Duygu YAMAN, Figen SEYMEN, Korkud DEMİREL, Koray GENÇAY