Evaluación de la resistencia teórica a la flexión de tres instrumentos utilizados en endodoncia mediante análisis de elementos finitos / Theoretical Evaluation through Finite Element Analysis of Flexural Strength of three Instruments used in Endodontics

Sandra Milena Prieto Cárdenas, Carlos Julio Cortés Rodríguez, Luis Fernando Gamboa Martínez, Javier Laureano Niño Barrera

Abstract


RESUMEN. Antecedentes: Los factores asociados a la fractura de un instrumento no se han examinado individualmente, este análisis es posible mediante el método de los elementos finitos Objetivo: Evaluar teóricamente el comportamiento a la flexión de tres diseños de instrumentos utilizados para la preparación biomecánica de los conductos radiculares mediante un análisis de elementos finitos. Métodos: Por medio de Ingeniería inversa se generaron los planos de las limas ProTaper Universal F2®, Mtwo 25/06® y WaveOne Primary® y con los planos posteriormente se construyeron los modelos matemáticos. Se realizó un análisis de elementos finitos  y como material se determinó una aleación de Níquel-Titanio, con propiedades mecánicas certificadas por la base de datos MATWEB®.  Se colocaron restricciones en todos los grados de libertad en  el mango de cada uno de los modelos y se aplicó una carga de 1 Newton en la punta de cada instrumento. Resultados: Los esfuerzos de Von Mises resultantes fueron: Mtwo 25/06®: 673,363 MPa con una deformación del 18 %, ProTaper Universal F2®: 341,322 MPa con una deformación de 7.6 % y WaveOne Primary®: 227.593 MPa y una deformación de 5 %. Conclusión: Ninguna lima superó el límite de falla por fractura (960 MPa), sin embargo el modelo de la lima Mtwo  25/06® presentó los valores de esfuerzo y deformación más altos, lo cual indica una buena flexibilidad que le permite ser usada en conductos con curvas pronunciadas, pero debido a la deformación resultante se recomienda dar un solo uso para prevenir su fractura.

ABSTRACT. Background: Factors associated with fracture of an instrument are not examined individually, this analysis is possible through the finite element method. Objective: To evaluate theoretically the flexural behavior of three designs of instruments used for biomechanical preparation of root canals using a finite element analysis. Methods: Through Reverse engineering drawings of ProTaper Universal files F2®, Mtwo 25 / 06® and WaveOne Primary® were generated and with these same planes mathematical models were built. Finite element analysis was performed and as material a nickel titanium alloy with mechanical properties certified by MATWEB® data base was determined. Restrictions in all degrees of freedom on the handle of each of the models were placed and a load of 1 Newton at the tip of each tool was applied. Results: The resulting Von Mises efforts were Mtwo 25 / 06®: 673.363 MPa with a strain of 18%, ProTaper Universal F2®: 341.322 MPa with a strain of 7.6% and WaveOne Primary®: 227 593 MPa and a strain of 5 %. Conclusion: No file exceeded the limit of failure by fracture (960 MPa), however the model Mtwo 25 / 06® lima presented stress values and higher deformation, indicating good flexibility allowing it to be used in ducts with sharp edges, but because of the resulting deformation is recommended that one use to prevent fracture


Keywords


aleación de níquel titanio; análisis de elementos finitos; endodoncia; fatiga por flexión; resistencia a la fatiga cíclica

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DOI: http://dx.doi.org/10.11144/Javeriana.uo34-73.ertf

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