A finite element study on the mechanical behavior of reciprocating endodontic files

Brazilian Journal of Oral Sciences

Mohamed I. El-anwar¹  Ayman O. Mandorah¹  Salah A. Yousief¹  Tarek A. Soliman¹  Tarek M. Abd El-wahab¹ 

关键词: endodontics;    stainless steel;    nickel;    titanium;   

DOI  :  10.1590/1677-3225v14n1a11

来源: SciELO

【 摘 要 】

AIM: To evaluate the mechanical behavior of reciprocating endodontic files, comparing nickel-titanium NiTi and stainless steel 316L St.St. 316L as manufacturing material for such instruments. METHODS: A three-dimensional finite element model was designed for this study. The simplified instrument model geometry was created on commercial CAD/CAM software. Real strain stress curves of St.St. 316L and NiTi were used in the analysis. Non-linear static analysis was performed to simulate the instrument inside root canal at an angle of 45° in the apical portion, and subjected to torsion of 0.3 N.cm. RESULTS: Non-linear NiTi material showed super elasticity and high functionality in such applications. Very high levels of stress appeared in the file at 3 mm from the tip close to yield point. CONCLUSIONS: St. St. 316L is not suitable for manufacturing reciprocating instruments. Modeling of the instrument with equivalent circular cross-sectional area did not affect results quality. Reciprocating instruments have short lifespan, thus manufacturers recommend using one file per tooth. Reciprocating instruments are recommended for less experienced dentist.

【 授权许可】

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