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《Journal of Modern Stomatology》 2010-01
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Clinically dynamic observation on the deformation process of Protaper rotary files

HE Man,YUAN Li,LI Sa,et al.Stomatology Department of Shenzhen People's Hospital,Shenzhen 518020  
Objective To investigate the damage process of Protaper rotary files.Methods Thirty sets of Protaper rotary files(Dentsply,21mm) were used to prepare bucal canals of upper first molars or mesial canals of lower first molars with Crown-Down method.After preparing each root canals,the file was examined with stereomicroscope.Results The morphological characteristics of files were classified into 3 types: normal,worn and damaged.The files used more,the more worn and damaged presented,especially for S1 and S2.Conclusion S1 and S2 represented more damages than other files in this study.It was recommended that the files should be used less than 5 times in heavily curved or narrow canals,and in this study no more than 13 times.
【CateGory Index】: R781.05
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