ABSTRACT
Objectives: To evaluate the success of certain methods that can be used in the removal
of separated instruments from different levels in curved and straight canals.
Methods: Instrument removal attempts were undertaken on 63 straight and 30 curved
canals containing a pre-fractured instrument using the ultrasonics under the visualization
of an operating microscope or conventional methods. In straight canals, a Masseran
Kit was additionally used to these techniques. The success of instrument removal in
relation to the techniques used and the location of the fragments in the root canal
were evaluated. Successful treatment was defined by the removal or complete by passing
of the fragments.
Results: The overall success rate was found 93.3% with ultrasonics and 66.6% when
only conventional methodswere used in curved canals. In straight canals, also the
success rate was the highest with ultrasonics (95.2%). This was followed by conventional
method (80.9%) and the least by Masserann Kit (47.6%). When the success rate was investigated
according to the location of the broken instruments, the lowest rate was found in
the apical third of root canal.
Conclusions: Location of the fragment and the shape of the root canal influence the
success of fractured instrument management. Ultrasonics under the visualization of
an operating microscope was found to be an effective removal method. (Eur J Dent 2009;3:90-95)
Key words:
Fractured instrument - Instrument removal - Operating microscope - Ultrasonics - Masserann
Kit
