Influencia de la profundidad cavitaria y la consecuente distancia luz/material en el grado de conversión y propiedades físicas de una resina compuesta nanohíbrida usando la técnica incremental
DOI:
https://doi.org/10.15517/ijds.2025.64491Palabras clave:
Profundidad cavitaria; Resinas compuestas nanohíbridas; Grado de conversión; FTIR, Microdureza; Resistencia a flexión biaxial; Propiedades fisicas; Distancia de fotopolimerización.Resumen
Evaluar la influencia de la profundidad cavitaria/distancia de la luz fotopolimerizante y el material sobre el grado de conversión, resistencia a flexión biaxial y microdureza de una resina nanohíbrida (superficies superior/inferior), mediante técnica incremental. Se fabricaron muestras cuadrangulares (4x4 mm) con variaciones de espesores de 2, 4 y 6 mm (n=10 por medida), simulando la profundidad de una preparación cavitaria, utilizando una resina nanohíbrida (Forma, A3, Ultradent) empleando la técnica incremental. Se evaluó microdureza Vickers y grado de conversión en superficies superior/inferior. La resistencia a la flexión biaxial se probó en discos de resina (8,5 mm diámetro, 2 mm espesor) utilizando moldes impresos 3D (apilados verticalmente). Microdureza y grado de conversión se analizaron empleando ANOVA de 2 vías y resistencia a la flexión biaxial con ANOVA de 1 vía. Para microdureza, el factor “espesor” más la interacción “superficie/espesor” resultaron estadísticamente significativos (p<0,05). El grupo de 2 mm mostró resultados más altos (99,41±52,23), seguido por 4 mm (84,1±15,74 VHN), mientras que 6 mm tuvo los más bajos (68,60±18,69 VHN), observándose valores más bajos en las superficies inferiores para este último grupo. Resistencia a la flexión biaxial no mostró diferencias significativas entre grupos. El grado de conversión fue significativamente mayor en superficies superiores en comparación con las superficies inferiores (superior: 47,74±9,67 %; inferior: 21,93±8,57 %). Para los grupos de 2 mm/4 mm, la polimerización siguió siendo adecuada (superficies superior/inferior). 6 mm produjo una polimerización de menor calidad, especialmente en superficies inferiores. El grado de conversión fue mayor en superficies superiores para todos los grupos. No se observó impacto significativo en el grado de conversión o resistencia a flexión según la distancia desde la luz fotopolimerizante. Las propiedades físicas y el grado de conversión no fueron proporcionales.
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