Reciprocating Movement on the Fatigue Life of Endodontic Rotary Instrument
Date Issued
2011
Date
2011
Author(s)
Huang, Yu-Hau
Abstract
Endodontic rotary instruments subjected to tensile and compressive stress in canal during endodontic treatment may fracture without any warning. Ni-Ti instruments have the shape memory effect, superelasticity of Ni-Ti alloy that make them suitable for the enlargement of curved root canals and have increased cutting efficiency. However, in spite of their clear advantages, Ni-Ti instruments may undergo premature failure by fatigue.
This study investigated the effect of reciprocating movement in small-degree and discovered that the way of moving in small-degree can increase the fatigue lives of Ni-Ti instruments. Besides the following finding, this study went a step further to confer a combination of parallel movement and small-degree reciprocating movement. It was found that the combination of two movements resulted in a significant longer cyclic fatigue life. To increase the fatigue life of Ni-Ti instruments by using different way of reciprocating movement in clinical applications can make it possible not only to improve the quality of medical treatment but to spare the medical resources.
Subjects
Ni-Ti endodontic rotary instrument
Fatigue
reciprocating movement
Tensile stress
Fracture
Type
thesis
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