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Journal of Practical Stomatology ; (6)2000.
Article in Chinese | WPRIM | ID: wpr-671007

ABSTRACT

19 cases with fractured instruments in root canals of posterior teeth were selected.The coronal 1-2 mm of the fractured instrument was exposed under microscope with ultrasonic technique.Irs instrument was used to clamp the end of the fractured instrument,then the fractured instrument was extracted.12 fractured instruments were removed by irs instrument successfully.The success rate was 63%,and the mean time consuming was 65 min.No root canal perforation happened.7 fractured instruments were removed by ultrasonic instruments,and the mean time consuming was 115 min.2 root canal perforations happened.The irs is an effective instrument for removal of separated instruments in root canals.

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