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《Beijing Journal of Stomatology》 2010-01
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Evaluation of injury on root canal during removing broken instruments by ultrasonic technique

ZHANG Zhi-ling,FU Mei,HOU Ben-xiang.Department of Stomatology,Beijing Children's Hospital,Capital Medical University,Beijing 100045,China  
Objective To evaluate the injury on root canal during removing broken instruments by ultrasonic technique.Methods To build research models with broken instruments located in the apical 1/3 part of the root of 30 extracted teeth were established in vitro.The ultrasonic technique with the aid of dental operating microscope was employed to remove the broken instruments.The roots were sectioned after operation and the cross section area of the root was measured and evaluated.Results The difference of injury to the root canal wall among the roots with curved angle of over 25 degree,under 25 degree or straight ones was significant (p0.05).The most remarkable injury on the wall was seen in the curved root over 25 degree,and at the sections of 4mm and 6 mm from apex.Conclusion Removal of a fractured file fragment from the apical third of curved canals should not be routinely attempted.
【Fund】: 国家自然科学基金(30872877);; 首都医学发展科研基金(2005-3046)
【CateGory Index】: R781.05
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