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Monomer release from nanohybrid composites after bleaching.
Pinar Gul1, Ozcan Karatas1, Hamit H Alp2
1Department of Restorative Dentistry, Faculty of Dentistry, Atatürk University.
Journal of Oral Science
|June 21, 2019
Summary
Bleaching dental composite resins did not affect monomer release, which decreased over time and remained below toxic levels. This study evaluated two nanohybrid resins and two bleaching agents.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biocompatibility
Background:
- Dental composite resins are widely used restorative materials.
- Concerns exist regarding potential monomer release from composites, especially after dental procedures like bleaching.
- Understanding monomer release kinetics is crucial for patient safety and material longevity.
Purpose of the Study:
- To evaluate the effect of two bleaching agents on monomer release from two nanohybrid composite resins.
- To quantify monomer release over time (1, 7, and 28 days).
- To assess the biocompatibility of released monomers in relation to bleaching treatment.
Main Methods:
- Two nanohybrid composite resins (Filtek Z550, Tetric N-Ceram) were used.
- Samples were bleached with Whiteness HP Maxx and Vivastyle.
- Monomer release was analyzed using high-performance liquid chromatography (HPLC) in 75% ethanol solution.
- Data were statistically analyzed using repeated measures ANOVA and LSD tests.
Main Results:
- Monomers were released from both composite resins.
- The amount of released monomers decreased significantly over the 28-day period (P < 0.05).
- Bleaching treatment did not significantly affect the overall monomer release profile, and levels were below toxic thresholds.
Conclusions:
- Bleaching procedures with Whiteness HP Maxx and Vivastyle do not appear to increase monomer release from Filtek Z550 and Tetric N-Ceram.
- Monomer release from these composite resins naturally decreases over time.
- The observed monomer release levels are considered safe and below toxic doses, suggesting good biocompatibility even after bleaching.
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