[Effect of ultrasonic in instrumentation on curved and obstructed root canal preparation].
OBJECTIVE
To investigate and evaluate the effect of ultrasonic instrumentation on curved and obstructed root canal preparation.


METHODS
Ultrasonic preparation was used on 117 root canals of 92 teeth due to resinifying therapy, pulp mummification and aging which could not be reopened and treated with traditional methods.


RESULTS
108 canals were successfully reopened with a successful rate of 92.3%. Failure occurred in 9 cases. 2 of them were lateral perforation. 2 were obstructed on curving position. 2 of them were due to pulp calcification in older patients. 3 were failing after resinifying therapy.


CONCLUSIONS
The ultrasonic treatment of root canal was an effective and safe method. It was still limited in a cases with pulp calcification and some fine root canals treated by resinifying therapy.
Li
Xiao-Feng
XF
Hangzhou Stomatological Hospital, Hangzhou 310006, Zhejiang Province, China. hxqlxf@hzcnc.com
Fang
Qiu-Ping
QP
Wang
Wei-Qian
WQ
Wang
Ren-Fei
RF
D000328:Adult; D000368:Aged; D003786:Dental Pulp Cavity / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018915:Root Canal Preparation; D012390:Root Canal Therapy / Q000379:methods*; D014464:Ultrasonic Therapy