2012
DOI: 10.1590/s1980-65232012000100011
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Evaluation of the lengths and angles of the tips of rotatory files in root canal preparations

Abstract: Purpose: To detect changes in the angles and lengths of the tips of rotary nickel-titanium files after use.Methods: Forty human teeth were prepared with eight sets of rotary ProTaper ® Universal nickel-titanium files with a length of 25 mm and rotation of 350 rpm. The files were evaluated in a scanning electron microscope (SEM) at three different times: Group A -before use; Group B -after using each file in the preparation of three molars; and Group C -after using each file in the preparation of five molars. T… Show more

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