Probability of removing fractured instruments from root canals

Aim  To evaluate in a clinical case series the location of fractured instruments, how many of them could be removed and to compare these findings with the results of a similar study. Methodology  Within an 18‐month period all referred endodontic cases involving fractured instruments within root cana...

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Bibliographic Details
Published in:International endodontic journal 2005-02, Vol.38 (2), p.112-123
Main Authors: Suter, B., Lussi, A., Sequeira, P.
Format: Article
Language:English
Subjects:
Chi-Square Distribution
Dental Instruments - adverse effects
Dental Instruments - statistics & numerical data
Dental Pulp Cavity
Dental Restoration Failure
Dentistry
Equipment Failure - statistics & numerical data
Foreign Bodies - etiology
Foreign Bodies - therapy
fractured instrument
Humans
instrument removal
Microscopy - instrumentation
operating microscope
Probability
Retreatment
Root Canal Preparation - instrumentation
root canal retreatment
separated instrument
Ultrasonic Therapy
ultrasonics
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Description
Summary:Aim  To evaluate in a clinical case series the location of fractured instruments, how many of them could be removed and to compare these findings with the results of a similar study. Methodology  Within an 18‐month period all referred endodontic cases involving fractured instruments within root canals were analysed. The protocol for removal of fractured instruments was: create straight‐line access to the coronal portion of the fractured instrument, attempt to create a ditched groove around the coronal aspect of the instrument using ultrasonic files and/or to bypass it with K‐Files. Subsequently, the fractured instrument was vibrated ultrasonically and flushed out of the root canal or an attempt was made to remove the instrument with the Tube‐and‐Hedström file‐Method or similar techniques. The location of the fractured instrument and the time required for removal were recorded. Successful removal was defined as complete removal from the root canal without creating a clinically detectable perforation. Results  In total, 97 consecutive cases of instrument fracture were included in the time period. In all, 84 instruments (87%) were removed successfully. There was a significant correlation between the time needed to remove fractured instruments and a decrease in success rate. Curved canals had significantly more fractured instruments than straight canals (P 
ISSN:0143-2885
1365-2591
DOI:10.1111/j.1365-2591.2004.00916.x