Alteraciones de la estructura de la lima primaria posterior a su uso / Structural Alterations of Primary File after Use

Javier Fernando Gutiérrez Barreto, Diana Carolina Cajamarca Medina, Johanna Carolina Monroy Navas

Abstract


RESUMEN. Objetivo: Analizar, mediante la técnica de difractometría de rayos X, las alteraciones en la estructura de las limas primarias con aleación alambre M del sistema WaveOne® (Dentsply Maillefer) después de la preparación del conducto mv1 de un primer molar superior y su posterior esterilización. Métodos: Se evaluaron 2 limas nuevas (grupo 1) y 6 limas usadas y esterilizadas (grupo 2) que fueron empleadas para preparar el conducto mv1 de molares superiores en pacientes que presentaban curvatura moderada. Resultados: Durante la preparación del conducto radicular no se presentó fractura de ningún instrumento. Los patrones de difracción de rayos X del grupo 1 mostraron tres picos principales con similar intensidad, el mismo ancho y posición 2θ. El comportamiento de la mayoría de las limas pertenecientes al grupo 2 exhibió un incremento de sus intensidades posterior a su uso. Se preservó la posición y ancho del pico en las diferentes muestras. Conclusiones: La lima primaria del sistema WaveOne® con aleación alambre M mostró un aumento en la intensidad de sus fases sin variación en la cantidad de picos, situación que sugiere que no se presenta daño en la aleación. 

ABSTRACT. Objective: To analyze structural changes of WaveOne® (Dentsply Maillefer) primary files (M-Wire alloy) after preparation of an upper first molar mv1 canal and subsequent sterilization. Methods: The analysis included 2 new (group 1) and 6 used and sterilized files (group 2) that were used to prepare the mesial buccal root canal of maxillary molars with moderate curvature. Structure was evaluated through X-ray diffractometry. Results: None of the instruments broke during canal preparation. X-ray diffraction patterns for group 1 showed 3 main peaks with similar intensity, same width, and 2θ position. Most group 2 files showed intensity increases after used. Peak and width stayed stable afterwards in most samples. Conclusion: WaveOne® primary file with M-Wire alloy exhibited an intensity increase in every phases and same number of peaks, which suggests there was not any damage to the alloy.


Keywords


alambre M; austenita; endodoncia; fase R, martensita; rangos de transformación; sistemas rotatorios

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

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