Journal
ACS BIOMATERIALS SCIENCE & ENGINEERING
Volume 7, Issue 4, Pages 1428-1437Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsbiomaterials.1c00152
Keywords
MA-POSS; hybrid particles; interfacial interaction; dental resin composite; physical-mechanical property
Categories
Funding
- Fundamental Research Funds for the Central Universities [2232018D3-11]
- National Key Research and Development Program of China [2016YFA0201702/2016YFA0201700]
- National Natural Science Foundation of China [51733002]
- Graduate Student Innovation Fund of Donghua University [CUSF-DH-D-2019019]
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By modifying the filler surface with MA-POSS, MA-POSS/SiO2 hybrid particles were constructed to enhance the performance of dental composites. The p-SiO2 particles significantly improved the mechanical properties and overall performance of the composites.
Endowing dental composites with excellent interfacial bonding through filler surface modification is pivotal to improve the physical-mechanical property and prolong the life of composite fillings. In this study, methacrylate-polyhedral oligomeric silsesquioxane (MA-POSS) acts as a molecular bridge between the commonly used SiO2 particles and the methacrylate-based resin matrix via a thiol-ene click reaction to construct MA-POSS/SiO2 (p-SiO2) hybrid particles. Synthesized p-SiO2 exhibited the roughest surface morphology and had more polymerizable groups, in comparison with SiO2 and silanized SiO2. Furthermore, the p-SiO2 particles were used as a reinforcement to fabricate bisphenol A glycerolate dimethacrylate/tri(ethyleneglycol) dimethacrylate-based dental composites, where the SiO2- and silanized SiO2-filled composites served as the control groups, and the filler loading was fixed at 65 wt %. Results of the mechanical properties indicated that the hybrid p-SiO2 particles significantly improved the flexural strength, flexural modulus, compressive strength, and work of fracture of dental composites, giving improvements of 251.2, 17.89, 122.3, and 1094%, respectively, over the SiO2-filled composites due to the strong interfacial interaction between the resin matrix and p-SiO2. Additionally, this optimal p-SiO2-loaded composite also presented better polymerization shrinkage, acceptable degree of conversion, curing depth, and cell viability. Grafting of MA-POSS onto a filler surface is a promising filler surface modification to improve the resin matrix/filler interfacial interaction, leading to the enhanced overall performance of composites.
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