Clinical study of the variations of root canal of maxillary molars treated by root canal retreatment
LIN Yao
YIN Wei
XU Dong-wei
HUANG Wen-xia
Abstract：AIM:To investigate the root canal variations of maxillary molars treated by root canal retreatment.METHODS:197 maxillary molars in 142 patients underwent root canal retreatment were observed by using dental operating microscope (DOM) and cone-beam computed tomography(CBCT),root canal variations and preliminary treatment effects were analyzed.RESULTS:The second mesiobuccal roots(MB2) of maxillary first molars had the highest missing rate (81.3％),followed by the mesiobuccal roots (MB,12.5％).36.6％ of the distal buccal roots (DB) and 34.7％ of the MB2 had been missed in the second molars.83.3％ of the maxillary first molars had 4 canals and 49.5％ of the second molars had 3 canals.The incidences of 5 canals were 7.3％ in the first and 11.9％ second morlars respectively,most of which(21.3％) were taurodontisms and with additional roots.The success rate of the retreatment of 1 year follow-up was 96.4％.CONCLUSION:The variations of maxillary molars are large and the root canals are easily missed.DOM and CBCT scans show advantages in the improve ment of endodontic retreatment outcome.
Keywords：maxillary molarroot canal missingvariationdental operating microscopecone-beam computed tomography
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 578-582,592 )