Evaluation of the morphology of fillers of modern dental nanocomposite materials

In the course of the research work, the morphological characteristics of the inorganic filler of five commercial and one experimental dental restorative composite materials containing nanosized particles were assessed using a Tescan Vega 3 LMH scanning electron microscope (Tescan, Brno, Czech Republic). Scanning electron microscopy revealed that the studied samples of imported paste-like composite materials contained fillers similar in shape and size: prepolarized conglomerates of irregular shapes ranging from 3 to 40 µm, consisting of nanoscale spheres less than 200 nm in size, and individual spherical particles up to 200 nm in size. The prepolarized filler in the low-modulus (flowable) imported composite had  a smaller diameter of 3 to 30 µm and a more regular spherical shape. The fillers in the Russian-produced composite materials had fragmented particles, with some of the filler consisting of micron-sized clusters ranging from 5 to 30 µm, formed by nanoscale spherical particles less than 100 nm in size. The experimental composite material contained microspheres ranging in size from 5 to 20 µm, consisting of nanoscale spherical particles up to 450 nm in size. In terms of morphological structure, the experimental composite is comparable to fillers of modern imported commercial dental composite materials.

1. Azmy E. et al. Impact of nanoparticles additions on the strength of dental composite resin //International Journal of Biomaterials. – 2022. – Т. 2022. – №. 1. – С. 1165431. https://doi.org/10.1155/2022/1165431.

2. Krikheli N.I., Bychkova M.N., Kramar O.V. et al. Application of light-cured nanofilled composite materials in dentistry (Literature review) // Med. alphabet. 2023. Vol. 30, 70–73. https://doi.org/10.33667/2078-5631-2023-30-70-73.

3. Wang R., Habib E., Zhu X. X. Application of close-packed structures in dental resin composites //dental materials. – 2017. – Т. 33. – №. 3. – С. 288–293. https://doi.org/10.1016/j.dental.2016.12.006

4. Barghamadi H. et al. Effects of nanoparticle size and content on mechanical properties of dental nanocomposites: experimental versus modeling //Iranian Polymer Journal. – 2015. – V. 24. – No. 10. – P. 837–848. https://doi.org/10.1007/s13726-015-0369-5.

5. Ferracane J. L. A historical perspective on dental composite restorative materials // Journal of Functional Biomaterials. – 2024. – V. 15. – No. 7. – P. 173. https://doi.org/10.3390/jfb15070173.

6. Bingül A. et al. A Review: Resin-Based Dental Materials and Their Characterization // Polymers for Advanced Technologies. – 2025. – V. 36. – No. 6. – P. e70239.

7. Ghods K. et al. Newest Developments of Nanotechnology in Dentistry: A Review of Literature // Journal of Dental Materials & Techniques. – 2022. – V. 11. – No. 1. https://doi.org/10.22038/jdmt.2022.61473.1488.

8. Jandt K. D., Watts D. C. Nanotechnology in dentistry: Present and future perspectives on dental nanomaterials // Dental Materials. – 2020. – V. 36. – No. 11. – P. 1365–1378. https://doi.org/10.1016/j.dental.2020.08.006.

9. Fujita K., Ikemi T., Nishiyama N. Effects of particle size of silica filler on polymerization conversion in a light-curing resin composite // Dental Materials. – 2011. – V. 27. – No. 11. – P. 1079–1085. https://doi.org/10.1016/j.dental.2011.07.010.

10. Timpe N. et al. Nanoporous silica nanoparticles with spherical and anisotropic shape as fi in dental composite materials // BioNanoMaterials. – 2014. – V. 15. – No. 3–4. – P. 89–99. https://doi.org/10.1515/bnm-2014-0010.

11. Pratap B. et al. Resin based restorative dental materials: Characteristics and future perspectives //Japanese Dental Science Review. – 2019. – V. 55. – No. 1. – С. 126–138. https://doi.org/10.1016/j.jdsr.2019.09.004.

12. Habib E., Wang R., Zhu X. X. Monodisperse silica-filled composite restoratives mechanical and light transmission properties //Dental Materials. – 2017. – V. 33. – No. 3. – P. 280–287. https://doi.org/10.1016/j.dental.2016.12.008.

13. Barghamadi H. et al. Effects of nanoparticle size and content on mechanical properties of dental nanocomposites: experimental versus modeling // Iranian Polymer Journal. – 2015. – V. 24. – No. 10. – P. 837–848. https://doi.org/10.1007/s13726-015-0369-5.

14. Cho K. et al. Dental resin composites: A review on materials to product realizations // Composites Part B: Engineering. – 2022. – V. 230. – P. 109495. https://doi.org/10.1016/j.compositesb.2021.109495.

15. Krikheli N.I., Bychkova M.N., Mendoza E.Yu., Rudneva O.V., Kuznetsova E.V., Kurmysheva A.Yu., Peretyagin P.Yu. Study of the morphology and chemical composition of nanosized spherical particles of silicon dioxide (SiO ) obtained by the sol-gel method. Rossijskaja stomatologija. 2024;17(4):12–17. https://doi.org/10.17116/rosstomat202417112.

16. Shiv R. K., Amar P. The in vitro wear behavior of nanozirconia filled dental composite in food slurry condition //The Journal of Engineering Tribology. – 2017. – V. 231. – No. 1. – P. 33–40. https://doi.org/10.1177/1350650116641329.

17. Kundie F. et al. Effects of filler size on the mechanical properties of polymer-filled dental composites: A review of recent developments //J. Phys. Sci. – 2018. – V. 29. – No. 1. – P. 141–165. https://doi.org/10.21315/jps2018.29.1.10.

18. Rodríguez H. A., Kriven W. M., Casanova H. Development of mechanical properties in dental resin composite: Effect of filler size and filler aggregation state // Materials Science and Engineering: C. – 2019. – Т. 101. – С. 274–282. https://doi.org/10.1016/j.msec.2019.03.090.

19. Liu J. et al. The development of filler morphology in dental resin composites: A review // Materials. – 2021. – V. 14. – No. 19. – P. 5612. https://doi.org/10.3390/ma14195612.

20. Wang R. et al. Wear behavior of light-cured resin composites with bimodal silica nanostructures as fillers //Materials Science and Engineering: C. – 2013. – V. 33. – No. 8. – P. 4759–4766. https://doi.org/10.1016/j.msec.2013.07.039.

21. Randolph L. D. et al. Filler characteristics of modern dental resin composites and their influence on physico-mechanical properties //Dental Materials. – 2016. – V. 32. – No. 12. – С. 1586–1599. https://doi.org/10.1016/j.dental.2016.09.034.

22. Aminoroaya A. et al. A review of dental composites: Challenges, chemistry aspects, filler influences, and future insights //Composites Part B: Engineering. – 2021. – V. 216. – P. 108852. https://doi.org/10.1016/j.compositesb.2021.108852.

23. Habib E. et al. Inorganic fillers for dental resin composites: present and future // ACS biomaterials science & engineering. – 2016. – V. 2. – No. 1. – P. 1–11. https://doi.org/10.1021/acsbiomaterials.5b00401.

24. Hategekimana F., Kiraz N. Preparation and characterization of silica based nanoclusters as reinforcement for dental applications //Polymer Composites. – 2022. – Т. 43. – №. 10. – С. 7564-7574. https://doi.org/10.1002/pc.26857.

25. Habib E., Wang R., Zhu X. X. Monodisperse silica-filled composite restoratives mechanical and light transmission properties //Dental Materials. – 2017. – V. 33. – No. 3. – P. 280-287. https://doi.org/10.1016/j.dental.2016.12.008.

26. Kim K.H., Ong J.L., Okuno O. The effect of fi loading and morphology on the mechanical properties of contemporary composites //The Journal of prosthetic dentistry. – 2002. – V. 87. – No. 6. – СP. 642–649. https://doi.org/10.1067/mpr.2002.125179.

27. Tamura Y., Kakuta K., Ogura H. Wear and mechanical properties of composite resins consisting of different filler particles //Odontology. – 2013. – V. 101. – No. 2. – P. 156–169. https://doi.org/10.1007/s10266-012-0074-1.

28. Amaya-Pajares S. P. et al. Development and maintenance of surface gloss of dental composites after polishing and brushing: Review of the literature //Journal of Esthetic and Restorative Dentistry. – 2022. – V. 34. – No. 1. – P. 15–41. https://doi.org/10.1111/jerd.12875.

29. Liu J. et al. The development of filler morphology in dental resin composites: A review // Materials. – 2021. – V. 14. – No. 19. – P. 5612. https://doi.org/10.3390/ma14195612.