Substances released from dental resin composites and glass ionomer cements

Abstract

An increasing number of cavities in the primary and permanent dentition is restored with tooth-colored materials, especially dental resin composites or glass ionomer cements. Several investigations have revealed that various components are segregated from different composite filling materials into an aqueous environment after polymerization. Most organic substances can be extracted from a set resin by organic solvents (methanol, tetrahydrofuran, ethanol). Furthermore, in most studies, the co-monomer TEG-DMA has been identified as the main compound released from polymerized resin composites into aqueous media. However, small quantities of the monomers (Bis-GMA, UDMA) and other co-monomers, as well as additives, may also be released into water. Very little data have been published about substances released from various types of glass ionomer cements (GIC), except the liberation of fluoride. Erosion studies have revealed that there is a considerable disintegration of GICs at lower pH-values. However, the nature of the eroded substances has not yet been clarified. Altogether, the data presented in this review indicate that information is comparably scarce for resin composites and GICs in comparison to the rich amount of knowledge concerning amalgams. Therefore, further studies are necessary to determine quality and quantity of substances segregated from resin composites and GICs.

NAC ameliorates dental composite-induced DNA double-strand breaks and chromatin condensation

“…Tooth-colored composite materials have increasingly entered dentistry in the 1990s 1) . Dental synthetic materials such as adhesives, fillings and crowns consist of (co)monomers that are chemically cured by UV or halogen light.…”

Evaluation of Flowable Resin Composite Surfaces Eroded by Acidic and Alcoholic Drinks

“…With resin composites, material properties such as color, cavity adaptability and wear are important for clinical use. For example, in the oral cavity environment, dental cement is immersed in various aqueous solutions, and clinical observations have shown that it undergoes continuous erosion over time 3,4) . One of the most important properties that determine the durability of dental materials in the oral cavity is their resistance to dissolution or disintegration.…”

Cambios en la resistencia compresiva del ionómero de vidrio al ser grabado con ácido ortofosfórico

“…En su proceso de maduración, las etapas por las que pasa el material son: la inicial, que se produce dentro de los primeros 10 minutos después de la mezcla, y la final, que supone la liberación del calcio y cationes de aluminio dentro de la matriz; es un proceso lento y continuo a largo plazo de la reacción ácido-base [13].…”

“…Los ionómeros de vidrio presentan una alta susceptibilidad a la humedad debido a su proceso de endurecimiento, el cual tiene una maduración inicial durante las primeras 24 horas [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

“…Sus mejores propiedades mecánicas le permiten ser grabado [16][17][18][19]. La sensibilidad a corto plazo por el agua resulta del ablandamiento de la superficie y, como consecuencia, una baja resistencia al desgaste, lo que limita el potencial del cemento ionómero de vidrio para las aplicaciones dentales [13].…”