Abstract
Objective: To evaluate the amount of residual monomers released after polymerization by the compomers in different colors and viscosities over time. Material and Methods: The compomer samples of different colors and viscosities (flowable compomers; blue-pink and packable compomers; A2-blue-pink-gold) were prepared in molds with an inner diameter of 5 mm and a height of 2 mm. In polymerization of samples, a LED unit was used. The amount of monomers released from the samples kept in 75% ethanol/water solution was measured by a high-performance liquid chromatography (HPLC) instrument in the 10th minute, in the 1st hour, and in the 1st, 7th, and 14th days. For statistical analyses, the paired sample t-test, independent sample t-test, and one-way ANOVA with Tukey's post hoc test were used. Results: The amount of residual monomers released from all materials increased over time. At the end of the 14th day, the most released monomer from all compomer samples was BisGMA. The total amounts of released monomers from the packable compomers were Gold>A2>blue>pink. The amount of residual monomers released from flowable compomers was higher in blue than in pink. Conclusion: The color and the viscosity are the factors affecting the residual monomer release in compomers.
Highlights
Nowadays, as a result of the developments in adhesive systems and aesthetic expectations, the frequency of the use of resin-containing restorative materials has been increasing steadily
BisGMA release from blue-colored flowable compomer was more than it was from pink compomer in all time periods, the difference between them was not statistically significant (p>0.05)
Based on the amounts of residual monomer release, blue and pink-colored compomers may be preferred to traditional A2 and gold-colored compomers
Summary
As a result of the developments in adhesive systems and aesthetic expectations, the frequency of the use of resin-containing restorative materials has been increasing steadily. The compomers (polyacid-modified composite resin), the use of which has been increasing in pediatric dentistry as an alternative to amalgam, consist of reaction initiators, organic matrix (Bisphenol-A-glycidyl methacrylate (BisGMA), Urethane dimethacrylate (UDMA), Hydroxyethyl methacrylate (HEMA), and Triethyleneglycol dimethacrylate (TEGDMA)) [1], new monomers such as butan-1,2,3,4-tetracarboxylic acid di-2hydroxyethylmethacrylate ester (TCB) and cycloaliphatic dicarboxylic acid dimethacrylate as functional monomers [2], and reactive inorganic particulate (flouroalumino silicate glass, itterbium trifluoride and barium aluminum silicate fluoro). In the polymerization reactions of compomers, it is expected that all carbon double bonds of monomers will react and join the polymer chain. Studies have shown that monomer matrix components have genotoxic, estrogenic, mutagenic, and allergic effects [4]
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