RESUMEN
OBJECTIVES: The latest LED dental curing devices claim sufficient curing of restorative materials with short curing times. This study evaluates mechanical and chemical properties as a function of curing time of two commercial composite filling materials cured with three different LED lamps. METHODS: The composites were Filtek Z250 (3M ESPE) and Tetric EvoCeram (Ivoclar Vivadent) and the LED curing devices were bluephase 16i (Ivoclar Vivadent), L.E.Demetron II (Kerr) and Mini L.E.D. (Satelec). Control samples were cured with a QTH-lamp (VCL 400, Kerr). The wear resistance after simulated tooth brushing, degree of conversion, curing depth, and amounts of residual monomers were measured after different curing times. RESULTS: The results of this study show that short curing time with high-intensity LEDs may influence the bulk properties of the materials, resulting in lower curing depth and increased residual monomer content. The measured surface properties of the materials, degree of conversion and wear resistance, were not affected by short curing times to the same extent. SIGNIFICANCE: This study demonstrates that reduced exposure time with high intensity LEDs can result in composite restorations with inferior curing depth and increased leaching of monomers. Dentists are recommended to use sufficient curing times even with high intensity LEDs to ensure adequate curing and minimize the risk of monomer leaching.
Asunto(s)
Resinas Compuestas/efectos de la radiación , Luces de Curación Dental/clasificación , Bisfenol A Glicidil Metacrilato/química , Cromatografía Líquida de Alta Presión/métodos , Resinas Compuestas/química , Diseño de Equipo , Humanos , Curación por Luz de Adhesivos Dentales/instrumentación , Curación por Luz de Adhesivos Dentales/métodos , Ensayo de Materiales , Fenómenos Mecánicos , Metacrilatos/química , Microscopía Electrónica de Rastreo , Polimerizacion , Poliuretanos/química , Espectrofotometría Ultravioleta/métodos , Espectroscopía Infrarroja por Transformada de Fourier/métodos , Propiedades de Superficie , Espectrometría de Masas en Tándem/métodos , Factores de Tiempo , Cepillado Dental/instrumentaciónRESUMEN
Resin-based dental restorative materials contain allergenic methacrylate monomers, which may be released into saliva after restorative treatment. Monomers from resin-based composite materials have been demonstrated in saliva in vitro; however, studies analyzing saliva after restorative therapy are scarce. The aim of this study was to quantify methacrylate monomers in saliva after treatment with a resin-based composite filling material. Saliva was collected from 10 patients at four start points--before treatment, and 10 min, 24 h, and 7 d after treatment--and analysed by combined chromatography/mass spectrometry. The monomers bisphenol-A diglycidyl methacrylate (Bis-GMA), 2-hydroxyethyl methacrylate (HEMA), and urethane dimethacrylate (UDMA) were detected and quantified in the samples collected shortly (10 min) after treatment. The amounts detected ranged from 0.028 to 9.65 µg ml(-1) for Bis-GMA, from 0.015 to 0.19 µg ml(-1) for HEMA, and from 0.004 to 1.2 µg ml(-1) for UDMA. Triethyleneglycol dimethacrylate (TEGDMA) was detected in four of the samples. Ethoxylated bisphenol-A dimethacrylate (Bis-EMA) was not detected. Monomers were not detected in saliva samples collected before treatment, or 24 h or 7 d after treatment, with the exception of one sample, 24 h after treatment, in which HEMA was detected. In conclusion, monomers from the investigated resin-based composite and adhesive system were present in saliva shortly after treatment. One week after treatment, no monomers could be detected in patients' saliva samples.
Asunto(s)
Resinas Compuestas/química , Materiales Dentales/química , Restauración Dental Permanente , Metacrilatos/análisis , Saliva/química , Bisfenol A Glicidil Metacrilato/análisis , Bisfenol A Glicidil Metacrilato/química , Resinas Compuestas/análisis , Preparación de la Cavidad Dental/clasificación , Materiales Dentales/análisis , Restauración Dental Permanente/clasificación , Recubrimientos Dentinarios/análisis , Recubrimientos Dentinarios/química , Femenino , Estudios de Seguimiento , Cromatografía de Gases y Espectrometría de Masas , Humanos , Masculino , Metacrilatos/química , Persona de Mediana Edad , Polietilenglicoles/análisis , Polietilenglicoles/química , Ácidos Polimetacrílicos/análisis , Ácidos Polimetacrílicos/química , Poliuretanos/análisis , Poliuretanos/química , Cementos de Resina/análisis , Cementos de Resina/químicaRESUMEN
Previous studies have shown that residual monomers, initiators, and additives are eluted from methacrylate-based dental composite materials. Recently, a composite material (Filtek Silorane), based on a new resin chemistry, was introduced. The purpose of this study was to investigate substances eluted from Filtek Silorane in water and ethanol. Polymerized specimen discs of the material were immersed in either distilled water or 75 vol% ethanol at 37 degrees C, and the solutions were analyzed using liquid chromatography-mass spectrometry after 1, 4, 24, and 72 h eluting time. No substances were found to leach from Filtek Silorane in water, whereas silorane monomers and an initiator component were eluted from the material into the ethanol solution.
