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Brazilian Journal of Oral Sciences
Piracicaba Dental School - UNICAMP
EISSN:
Vol. 14, No. 1, 2015, pp. 52-59
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Bioline Code: os15011
Full paper language: English
Document type: Research Article
Document available free of charge
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Brazilian Journal of Oral Sciences, Vol. 14, No. 1, 2015, pp. 52-59
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A finite element study on the mechanical behavior of reciprocating endodontic files
El-Anwar, Mohamed I.; Mandorah, Ayman O.; Yousief, Salah A.; Soliman, Tarek A. & El-Wahab, Tarek M. Abd
Abstract
Aim: To evaluate the mechanical behavior of reciprocating endodontic files, comparing nickeltitanium
(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.
Keywords
endodontics; stainless steel; nickel; titanium
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