Document Detail

A comparison of nickel-titanium rotary instruments manufactured using different methods and cross-sectional areas: ability to resist cyclic fatigue.
MedLine Citation:
PMID:  20303058     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: This study examined the effect of the manufacturing methods (ground, electropolished, and twisted) and the cross-sectional area (CSA) of nickel-titanium (NiTi) rotary instruments on their cyclic fatigue resistance. STUDY DESIGN: A total of 80 NiTi rotary instruments (ISO 25/.06 taper) from 4 brands (K3, ProFile, RaCe, and TF) were rotated in a simulated root canal with pecking motion until fracture. The number of cycles to failure (NCF) was calculated. The CSA at 3 mm from the tip of new instruments of each brand was calculated. The correlation between the CSA and NCF was evaluated. All fractured surfaces were analyzed using a scanning electron microscope to determine the fracture mode. RESULTS: The TF instruments were the most resistant to fatigue failure. The resistance to cyclic failure increased with decreasing CSA. All fractured surfaces showed the coexistence of ductile and brittle properties. CONCLUSION: The CSA had a significant effect on the fatigue resistance of NiTi rotary instruments.
So-Ram Oh; Seok-Woo Chang; Yoon Lee; Yu Gu; Won-Jun Son; Woocheol Lee; Seung-Ho Baek; Kwang-Shik Bae; Gi-Woon Choi; Sang-Min Lim; Kee-Yeon Kum
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics     Volume:  109     ISSN:  1528-395X     ISO Abbreviation:  Oral Surg Oral Med Oral Pathol Oral Radiol Endod     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-03-22     Completed Date:  2010-07-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9508562     Medline TA:  Oral Surg Oral Med Oral Pathol Oral Radiol Endod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  622-8     Citation Subset:  D; IM    
Copyright Information:
Copyright 2010 Mosby, Inc. All rights reserved.
Department of Conservative Dentistry, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.
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MeSH Terms
Dental Alloys / chemistry*
Equipment Design
Equipment Failure
Manufactured Materials / classification
Materials Testing
Microscopy, Electron, Scanning
Nickel / chemistry*
Root Canal Preparation / instrumentation*
Stress, Mechanical
Surface Properties
Titanium / chemistry*
Reg. No./Substance:
0/Dental Alloys; 12035-60-8/titanium nickelide; 7440-02-0/Nickel; 7440-32-6/Titanium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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