Document Detail

Distortion and breakage of Liberator, EndoSequence, and ProFile systems in severely curved roots of molars.
MedLine Citation:
PMID:  20307753     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: The aim of this study was to investigate the incidence of endodontic file distortion and breakage when the Liberator (Miltex Inc, York, PA), EndoSequence (Brasseler USA, Savannah, GA), and ProFile (Tulsa Dental Products, Tulsa, OK) systems were used to instrument severely curved root canals of extracted human molars. METHODS: Eighty-four roots of extracted human molars with curvatures measuring 40 degrees to 80 degrees were used. The roots were randomly assigned into four groups based on the rotary instrumentation system: group 1, ProFile (.04 taper); group 2, EndoSequence (.04 taper); group 3, Liberator (.04 taper); and group 4, Liberator (.02 taper). RESULTS: File distortion was 19.4%, 10%, 44.4%, and 59.1% for the ProFile, EndoSequence, and Liberator .04 and Liberator .02 groups, respectively. There were statistically significant differences between the ProFile and Liberator .04 groups (p < 0.05), the ProFile and Liberator .02 groups (p < 0.01), the EndoSequence and Liberator .04 groups (p < 0.01), and the EndoSequence and Liberator .02 groups (p < 0.01). Broken files occurred in 2.8% of the ProFile group and 7.4% of the Liberator .04 group. There were no broken files in the EndoSequence or Liberator .02 groups. No statistically significant differences were found among the four groups (p = 0.28) with regard to file breakage. CONCLUSION: It can be concluded that more file distortions occurred in both Liberator groups than with either the ProFile or the EndoSequence groups to a statistically significant degree.
Jeffrey T Stewart; Shawn Lafkowitz; Keith Appelbaum; Gary Hartwell
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Publication Detail:
Type:  Journal Article     Date:  2010-02-06
Journal Detail:
Title:  Journal of endodontics     Volume:  36     ISSN:  1878-3554     ISO Abbreviation:  J Endod     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-03-23     Completed Date:  2010-06-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7511484     Medline TA:  J Endod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  729-31     Citation Subset:  D    
Copyright Information:
Published by Elsevier Inc.
Department of Endodontics, UMDNJ-NJDS, Newark, NJ 07103, USA.
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MeSH Terms
Chi-Square Distribution
Dental Alloys
Dental Instruments*
Dental Pulp Cavity / anatomy & histology*
Dental Stress Analysis
Equipment Failure
Molar / anatomy & histology
Root Canal Preparation / instrumentation*
Tooth Root / anatomy & histology*
Torsion, Mechanical
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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