Relationship between file size and stiffness of nickel titanium instruments |
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Authors: | J J Camps W J Pertot B Levallois |
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Institution: | Department of Restorative Dentistry and Endodontics, University of Marseille, France |
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Abstract: | Abstract – The purpose of this study was to evaluate the relationship existing between file size and stiffness for 3 endodontic files made of nickel titanium. Three groups of instruments with different cross-sections were tested: a triangular cross-section, a square cross-section and a modified triangular cross-section. The instruments were tested from size 15 to size 40 or 60 according to ANSI/ADA specification n°28 for binding moment evaluation. There was a statistically significant difference between the 3 groups: the square cross-section K files presented a larger bending moment than the triangular cross-section K files, which presented a larger bending moment than the modified cross-section K files. Like the stainless steel instrumens, there was an exponential relationship between file size and bending moment for triangular and square cross-section K files, but a linear relationship between file size and bending moment for the files with a modified triangular cross-section. |
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Keywords: | endodontic instrument root canal treatment nickel-titanium |
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