Failure mechanism of ProTaper Ni-Ti rotary instruments during clinical use: fractographic analysis

International Endodontic Journal
A P Spanaki-VoreadiS Zinelis

Abstract

To evaluate the failure mechanism of ProTaper Ni-Ti rotary instruments fractured under clinical conditions. A total of 46 ProTaper instruments that failed (fractured and/or plastically deformed) during the clinical use were collected from various dental clinics, whereas a new set of ProTaper instruments served as control. After inspection under stereomicroscopy the instruments were classified into three categories: (i) plastically deformed but not fractured, (ii) fractured with plastic deformation and (iii) fractured without plastic deformation. Three instruments from each group were analysed with computerized X-ray microtomography (micro-XCT) to detect surface and internal defects, whilst all the fracture surfaces were investigated under SEM. Stereomicroscopic inspection showed that 17.4% of the discarded instruments were only plastically deformed, 8.7% were fractured with plastic deformation and 73.9% were fractured without plastic deformation. Micro-XCT revealed instruments without any surface or bulk defects along with a few files with crack development below the fracture surface. No defects were identified in the unused instruments. SEM examination of fractured surfaces demonstrated the presence of dimples and cones, a typ...Continue Reading

References

Feb 1, 1987·Pharmacology & Toxicology·G LundgrenG Jacobsson
Feb 1, 1997·Journal of Endodontics·J P PruettD L Carnes
Jun 18, 1999·International Endodontic Journal·G M YaredP Machtou
Feb 24, 2001·Journal of Endodontics·B SattapanH H Messer
Apr 20, 2001·International Endodontic Journal·G M YaredP Machtou
Aug 3, 2001·International Endodontic Journal·G Gambarini
Jun 18, 2002·Journal of Endodontics·Uei-Ming LiChun-Pin Lin
Jun 18, 2002·Journal of Endodontics·Spiros Zinelis, John Margelos
Mar 27, 2003·International Endodontic Journal·O A PetersF Barbakow
Apr 19, 2003·International Endodontic Journal·B MartínC Rodríguez
Aug 22, 2003·Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics·Ghassan YaredKiran Kulkarni
Feb 19, 2004·Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics·D FifeL r Britto Lr
Apr 7, 2004·Dental Clinics of North America·Thomas Clauder, Michael A Baumann
Apr 16, 2004·Journal of Endodontics·Elio BeruttiDamiano Pasqualini
Apr 16, 2004·Journal of Endodontics·Matthew T AnkrumJohn E Truitt
Sep 28, 2004·Journal of Endodontics·Peter ParashosHarold H Messer
Dec 23, 2004·Journal of Endodontics·Satish B AlapatiGlenn S Daehn
Jul 14, 2005·International Endodontic Journal·B PengT J Xia
Oct 13, 2005·International Endodontic Journal·G S P CheungB W Darvell

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Citations

Jan 19, 2013·Journal of Applied Oral Science : Revista FOB·Youssef S Al JabbariSpiros Zinelis
Dec 7, 2011·Medicina oral, patología oral y cirugía bucal·S ShahiM Foroughreyhani
Apr 21, 2012·Journal of Endodontics·Giulio GaviniDirce Akemi Sacaguti Kawakami
Jun 22, 2011·Journal of Endodontics·Chiara PiraniCarlo Prati
Oct 6, 2009·Journal of Endodontics·Ugur Inan, Nihan Gonulol
Jul 19, 2008·Journal of Endodontics·Fabiola Ormiga Galvão BarbosaMarcos Cesar Pimenta de Araújo
Oct 24, 2006·Journal of Endodontics·Peter Parashos, Harold H Messer
May 22, 2007·International Endodontic Journal·G S P Cheung, B W Darvell
Feb 20, 2007·International Endodontic Journal·G S P CheungB W Darvell
Nov 1, 2011·International Endodontic Journal·J B KingM J Mayerchak
Jun 11, 2011·International Endodontic Journal·E KostiT Lambrianidis
Jan 22, 2013·International Endodontic Journal·Y ShenM Haapasalo
Jun 7, 2013·Restorative Dentistry & Endodontics·Syed Mukhtar-Un-Nisar AndrabiSharique Alam
Apr 13, 2007·Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics·Spiros ZinelisGeorge D Papadimitriou
Apr 18, 2019·Brazilian Oral Research·Carlos Roberto Emerenciano BuenoEloi Dezan-Júnior

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