Publication: Mapeo completo de la fuerza de unión a la microtracción de la cementación en buscade diferencias debido a la contracción de polimerización.
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2021
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Abstract
Objetivos: Comprobar si los movimientos transversales debidos a la contracción de polimerización de los materiales de cementado afectan diferencialmente a su unión a las estructuras cementadas, dependiendo de sus distancias al centro de la masa de cemento, y si este efecto está relacionado con al factor de configuración. Se comprobaron dos hipótesis: (1) hay una relación decreciente estadísticamente significativa entre la fuerza de la unión y las distancias transversales al centro del material de cementado y, (2) hay diferencias estadísticamente significativas entre los diferentes espesores de cemento.
Materiales y métodos: 10 pares de cilindros de PMMA (15 mm Ø) se cementaron entre sí en un sistema adaptable (adhesivo Scotchbond Universal & Relyx Universal, ambos curados químicamente), sujetos a dos fuerzas diferentes (20 & 70N), formando dos grupos de 5 muestras cada uno, con diferentes factores de configuración. Las muestras se seccionaron en barras en los planos x e y. Las posiciones relativas de las barras, en cada muestra, se determinaron y clasificaron en 10 categorías según su distancia al centro de la masa de cemento y se sometieron a un test de microtracción en un dispositivo rígido. La primera hipótesis se corroboró comprobando la relación lineal entre la fuerza de tracción y las distancias al centro de la masa de cemento. La segunda hipótesis se comprobó mediante test de Mann-Whitney comparando las fuerzas de unión entre los grupos, para todas las categorías.
Resultados: ANOVA de la regresión lineal entre las fuerzas de unión y las distancias fue significativa en todas las muestras excepto en una del grupo 20N, por lo que la credibilidad de la primera hipó tesis se mantiene parcialmente. Las diferencias de las fuerzas de unión entre grupos, por categorías, fueron estadísticamente significativas, por lo que la credibilidad de la segunda hipótesis se mantiene.
Conclusiones: Existe una correlación negativa entre la resistencia a la microtracción y la distancia al centro de la masa. A menor espesor de cemento y mayor factor de configuración, mayor valor de resistencia a la microtracción.
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Trabajo de Fin de Máster en Ciencias Odontológicas, Facultad de Odontología UCM, Departamento de Odontología Conservadora y Prótesis, Curso 2020/2021
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