Moisture absorption and resistance to acid dissolution in glass ionomer cements with and without surface protection during the first 24 hours: in vitro study

Abstract

Objective: To evaluate the effect of surface protection on moisture absorption and acid dissolution resistance in glass ionomers during the first 24 hours. Methodology: An experimental (in vitro), longitudinal, and comparative study was conducted with 40 glass ionomer disk samples (10mm x 2mm). Two groups were formed: G1 (control) without surface protection and G2 (experimental group) with surface protection (solid petroleum jelly). To evaluate moisture absorption, the samples were immersed in water, and to assess acid dissolution, they were submerged in 3% citric acid. The weight of the samples was recorded at 0, 6, 12, and 24 hours and compared between the groups (independent t-test) and within each group (dependent t-test). Results: No significant difference was found between the two groups in moisture absorption, but differences were observed in acid dissolution at 6 and 12 hours. In group G1, both submerged in water (p=0.0009; p=0.0094; p=0.0158) and in acid (p=0.000; p=0.000; p=0.000), significant differences were found at 6, 12, and 24 hours, respectively. In group G2, submerged in water (p=0.3279; p=0.0004; p=0.0000) showed differences at 12 and 24 hours, and in acid (p=0.0000; p=0.0000; p=0.0000), no significant differences were observed. Conclusion: No significant difference was found in moisture absorption between using or not using surface protection over the 24-hour period; however, differences in acid dissolution were observed between the two groups.

Objetivo: Evaluar el efecto de la protección superficial sobre la absorción de humedad y resistencia a la disolución ácida en ionómeros de vidrio durante las primeras 24 horas. Metodología: Estudio de tipo experimental (in vitro), longitudinal, comparativo realizado en 40 muestras de discos de ionómero de vidrio (10mmx2 mm). Fueron formados 2 grupos: G1(control) sin protección superficial y G2(grupo experimental) con protección superficial (vaselina sólida). Para evaluar la absorción de humedad las muestras fueron sumergidas en agua y para evaluar la disolución ácida fueron sumergidas en ácido cítrico al 3%. Fueron registrados el peso de las muestras a las 0; 6; 12 y 24 horas y se comparó entre ambos grupos (prueba t student independiente) y entre cada grupo (t student dependiente). Resultados: No hubo diferencia significativa entre ambos grupos en la absorción de humedad mientras que en la disolución ácida hubo diferencia a las 6 y 12 horas. A nivel de cada grupo, en el G1 tanto sumergido en agua (p=0.0009; p=0.0094 y p=0.0158), como en ácido (p=0.000; p=0.000 y p=0.000) hubo diferencia significativa a las 6, 12 y 24 horas, respectivamente. En G2 sumergido en agua (p=0.3279; p=0.0004 y p=0.0000) hubo diferencia a las 12 y 24 horas y en ácido (p=0.0000; p=0.0000 y p=0.0000) no se observaron diferencias significativas. Conclusión: No hubo diferencia entre usar o no usar protección superficial en la absorción de humedad durante las 24 horas; mientras que en la disolución ácido sí se mostraron diferencias entre ambos grupos