The effect of pre-heating on monomer elution from bulk-fill resin composites

Abstract

Background The present study was aimed to evaluate the effect of pre-heating of bulk -fill resin composites on monomer elution from them. Material and Methods Three different types of resin composites were used including Tetric N-Ceram Bulk Fill, X-tra Fill and X-tra Base. 10 cylindrical samples were prepared from each resin composites. Before light curing, 5 samples were pre-heated until reaching 68˚C, then 5 other samples were polymerized at room temperature. After 24 hours, release of UDMA, TEGDMA and BIS-GMA monomers were measured by High-Performance Liquid Chromatography analysis. Data analysis was performed by two-way ANOVA test, Games-Howell and Sidak post hoc tests. Results Pre-heating did not have any statistically significant effect on the mean values of UDMA, TEGDMA and Bis-GMA elution ( p >0.05). The greatest amount of released Bis-GMA and UDMA was obtained from Tetric N-Ceram Bulk-fill composite. The greatest amount of released TEGDMA was obtained from X-tra Fill composite. X-tra Base composite showed the lowest amount of monomer release ( P <0.001). Conclusions Pre-heating did not have any effect on monomer release from bulk-fill resin composites. Moreover, the amount and the type of monomers released from various bulk-fill resin composites were not similar. Key words: Bulk fill composite resin, elution, HPLC, residual monomer, temperature.

Pre-Heating Effect on Monomer Elution and Degree of Conversion of Contemporary and Thermoviscous Bulk-Fill Resin-Based Dental Composites

“…To the best of our knowledge, only one published article deals with the monomer elution from three pre-heated RBCs and found no effect of pre-cure temperature (68 °C) on the amount of leached UDMA, TEGDMA, and BisGMA [ 85 ]. Few available pieces of research reported that pre-heating of both conventional and bulk-fill RBCs did not influence cell viability, however, polymerized samples were used to examine the cytotoxicity without determination of the eluted monomers [ 63 , 83 , 86 ].…”

Direct and indirect monomer elution from an RBC product family

“…There are many elution studies in the literature. These investigate, for example, the influence of additives [27], exposure time to light [28] or thermal pre-treatment on the amount of elutable substances [29]. Their focus is on the development of new conditions that occur in the care of patients.…”

Effect of thickness on the degree of conversion, monomer elution, depth of cure and cytotoxicity of bulk-fill composites

“…On the other hand, SF has the higher filler content (83.5%), and this could be the main reason why SF with the lowest DC value had the lowest total amount of eluted monomers. An increase in filler content leads to a decrease in the solvent absorption of composites, thus reducing the degree of monomer elution [32]. Khalid et al showed that significantly high monomer elution and structural changes occurred at SDR [33].…”