Document Detail

Measurement of the cutting efficiency of endodontic instruments: a new concept.
MedLine Citation:
PMID:  9220749     Owner:  NLM     Status:  MEDLINE    
The cutting efficiency of endodontic instruments was measured using an original experimental technique that incorporates new concepts to simulate clinical conditions. Five designs of #ISO 030 endodontic instruments, K-reamer (Maillefer), Flexofile (Maillefer), Helifile (Micro-mega), K-flex (Kerr), and Unifile (De Trey), were chosen and their cutting efficiency assessed at their full working length of 16 mm on two Plexiglas parallelepipeds tilted to follow the 2% conicity of the instruments. For each instrument, four series of 25 cuts were carried out and each cut made on a new flat, smooth Plexiglas surface with an even hardness of 33 VHN. Instruments were tested under a simulated clinical condition of a quarter clockwise turn ROTARY MOTION followed by a PULL ACTION at 16 mm/s rate, with a fixed load on the instrument of 325 g. Water irrigation at a rate of 85 ml/s was supplied before each procedure. Cutting efficiency was evaluated in terms of mass of Plexiglas cut (using a Mettler analytic balance with accuracy of 3 x 10(-5) g) per unit of energy used by the instrument, i.e. mg/J. Unifile was found to have the best cutting efficiency of 0.80 +/- 0.01 (Mean +/- SD) and lowest cutting efficiency loss followed by Flexofile 0.70 +/- 0.03 then Helifile 0.36 +/- 0.01 then K-flex 0.51 +/- 0.07. K-reamer was found to have the lowest cutting efficiency of 0.16 +/- 0.05.
Y Haïkel; R Serfaty; T T Lwin; C Allemann
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of endodontics     Volume:  22     ISSN:  0099-2399     ISO Abbreviation:  J Endod     Publication Date:  1996 Dec 
Date Detail:
Created Date:  1997-07-25     Completed Date:  1997-07-25     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7511484     Medline TA:  J Endod     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  651-6     Citation Subset:  D    
Department of Endodontics C.R.O., INSERUM U424, University Louis Pasteur of Strasbourg, France.
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MeSH Terms
Dental Instruments / standards*
Evaluation Studies as Topic
Materials Testing
Models, Structural
Reproducibility of Results
Root Canal Preparation / instrumentation*
Reg. No./Substance:
0/Methylmethacrylates; 80-62-6/Methylmethacrylate

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

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