Torque resistance of three different types of nickel-titanium rotary instruments

To compare torsional fracture of three different types of nickel-titanium rotary instruments ProTaper, Hero642 and Mtwo by making a stimulate models in vitro. Through the establishment of model in vitro, compared the different time with 3 kinds of nickel titanium file in cutting-edge bound occurs, a...

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Bibliographic Details
Published inHua xi kou qiang yi xue za zhi Vol. 28; no. 5; p. 471
Main Authors Sun, Wei, Hou, Ben-xiang
Format Journal Article
LanguageChinese
Published China 01.10.2010
Subjects
Cross-Sectional Studies
Dental Alloys
Equipment Design
Equipment Failure
Materials Testing
Nickel
Root Canal Preparation
Stress, Mechanical
Surface Properties
Titanium
Torque
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Summary:To compare torsional fracture of three different types of nickel-titanium rotary instruments ProTaper, Hero642 and Mtwo by making a stimulate models in vitro. Through the establishment of model in vitro, compared the different time with 3 kinds of nickel titanium file in cutting-edge bound occurs, and to observe the section of fractured instruments by scanning electron microscope. The resistence to torque was different from three types of nickel titanium instruments. The time to fracture of Mtwo was significantly longer than ProTaper's and Hero642's, but ProTaper's and Hero642's had no significant difference. Three kinds cross-sectional design were different, a lot of toughness nests were seen in broken surface. Most of them were ductile fracture. Time to fracture was influenced by the quality disfigurement. The resistance to torque of Mtwo was better than ProTaper and Hero642. The lifespan was influenced by the design of cross-section. The quality disfigurement of the files reduced the resistance to flexual
ISSN:1000-1182