Alteraciones de la estructura de la lima primaria posterior a su uso / Structural Alterations of Primary File after Use
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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.
alambre M, austenita, endodoncia, fase R, martensita, rangos de transformación, sistemas rotatorios
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