Clinical study of broken instruments in root canals
WANG Xia-yong
HUANG Hui-fang
Abstract：AIM:To observe the characteristics of broken instruments in root canals and to evaluate the suc-cess rate of broken instrument removal.METHODS:94 cases with broken instruments in root canals were collected. The types and position of the broken instruments in root canals were recorded.Success rate of the broken instrument re-moval was analysed.RESULTS:Among the 94 broken instruments in root canals,10 were in anterior teeth,15 in pre-molars and 69 in molars.Concerning the types of instruments, 30 were stainless steel files, 49 nickel-titanium rotary instrunlents, 5 ultrasonic tips, 3 barbed broaches and 7 spiral conveyors.In regard to position of broken instruments, 14 were in upper root canals, 28 in middle root canals, and 52 in lower root canals.The success rate of broken instru-ments removal was 70.2%under dental operating microscope.CONCLUSION:Broken instrument occurred frequent-ly in the middle and lower part of small canals in molars.Micro-ultrasonic technique is effective in clinical assessment and management of broken instruments in root canals.
Keywords：broken instrumentroot canal treatmentdental operating microscope
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 729-731,691 )