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《Journal of Practical Stomatology》 2006-05
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Morphological characteristics of damaged Hero642 Ni-Ti dental files

Yuan Li,Yue Lin, Wang Jiade.Department of Cariology, Operative Dentistry and Endodontics, School of Stomatology, Peking University, Beijing 100081, China  
Objective:To analyze the morphological characteristics of damaged Hero642 Ni-Ti dental files, and explain the relationship between deformation and fracture.Methods:71 discarded files were observed under naked eyes and stereomicroscope. 5 of which were observed under S360 scanning electronic microscope (SEM), and typical photos were taken for analysis.Results:The damage of Hero642 Ni-Ti dental files was characterized by fracture, tightened or loosened spiral and some kind of deformation detected at more than 35 times magnification. Under SEM, the dimple pattern was represented in the fracture surface of the files. Conclusion:Most Hero642 Ni-Ti files fractured within 4 mm from the tip which belongs to the pattern of ductile fracture.
【Fund】: “十五”国家科技攻关项目(2004BA720A23)
【CateGory Index】: R781.05
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