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URL: http://jdm.tums.ac.ir/article-1-108-en.html
Background and Aims:The elution of residual monomers from cured dental composites to oral cavity has a harmful effect on human health and can affect their clinical durability. The purpose of this study was to evaluate the amount of eluted monomers (Bis-GMA, TEGDMA, UDMA) from two types of composites (Gradia and P60) after exposure to food simulating liquids such as ethanol (25, 50, 75 %) and heptane 50 % for 24 hours and 7 days.
Materials and Methods: Forty specimens of each composite were prepared.Equal numbers of each composite were immersed in tubes containing 2cc volumes of 25, 50, 75 % ethanol and 50 % heptane. The amount of eluted monomers in standard condition such as Bis-GMA, TEGDMA and UDMA was measured by GC/MS (Gas Chromatography/Mass Spectroscopy). Data were statistically analyzed by three-way and one-way ANOVA. The level of significance was set at P<0.05.
Results: The results showed that TEGDMA was the only released monomer from all specimens. Gradia significantly released more TEGDMA compared with P60. In assessing the effect of environment, the results showed that monomers released from ethanol were more than those released from heptane and the concentration rate of 75 % ethanol resulted in most monomers release. In assessing the effect of time, the observation showed that more monomers were released during 7 days compared to 24 hours.
Conclusion:
Ethanol caused more release of monomers compared with heptane and 75 % ethanol released the most amounts of monomers. Gradia released more TEGDMA compared to P60. In addition, more monomers were released with increasing the time.Received: 2009/07/3 | Accepted: 2010/03/11 | Published: 2013/09/25
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