Efecto del Tipo de Fotoiniciador y Condición de Fotoactivación sobre las Propiedades Físico-Mecánicas de las Resinas de Ortodoncia
DOI:
https://doi.org/10.21270/archi.v11i1.5589Palabras clave:
Ortodoncia, Resinas Compuestas, Fotoiniciadores Dentales, Lámparas de Polimerización DentalResumen
Objetivo: El objetivo de este estudio fue evaluar las propiedades físico-mecánicas de resinas de ortodoncia experimentales, que contienen diferentes sistemas fotoiniciadores y fotoactivados a través de un bracket cerámico, utilizando una unidad de curado de diodos emisores de luz de alta irradiancia y amplio espectro. Métodos: Se formularon compuestos de resinas experimentales (50:50 BisGMA / TEGDMA: 60% de partículas silanizadas de feldespato) con diferentes fotoiniciadores de acuerdo con los siguientes grupos: fenilpropanoamina + amina DMAEMA (PPD), canforquinona + amina DMAEMA (CQ) u óxido bisacilfosfínico (BAPO). Se utilizó como control un composite de resina ortodóncica comercial (Transbond XT). A continuación, los materiales se distribuyeron en dos grupos, según la condición de fotoactivación: directamente o a través de un soporte cerámico, durante 20s a 1200 mW/cm2. En la secuencia, se hicieron quince discos de compuestos, de 5 mm de diámetro y 1 mm de espesor, para cada uno de los ocho grupos. El grado de conversión (DC) se determinó mediante espectroscopía Raman. La dureza Knoop (KHN) se midió inmediatamente después de la confección y después de 24 horas de almacenamiento en etanol al 100% para la evaluación de la densidad de reticulación indirecta (CLD). Los datos se analizaron usando ANOVA de dos vías seguido de la prueba de Tukey (α = 0.05). Resultados: La CD del compuesto BAPO fue significativamente mayor en comparación con los otros materiales, independientemente de la condición de fotoactivación. El KHN fue significativamente diferente entre los grupos de compuestos en la siguiente secuencia: BAPO> Transbond XT> CQ> PPD. La fotoactivación directa presentó valores de KHN más elevados, independientemente del tipo de material. Con respecto al CLD, hubo diferencia estadística solo para el factor material, como sigue: PPD> BAPO = CQ = Transbond XT. Conclusión: El tipo de fotoiniciador y la condición de fotoactivación influyeron significativamente en las propiedades físico-mecánicas de los materiales evaluados.
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