High-Performance Dental Resins Containing a Starburst Monomer

Area of Science:

• Dental Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Dimethacrylate-based monomers are widely used in dental resins.
• Existing monomers face challenges including poor mechanical properties, volumetric shrinkage, and estrogenicity.

Purpose of the Study:

• To synthesize and evaluate a novel resin monomer, 9-armed starburst polyurethane acrylate (NPUA).
• To compare the physicochemical and mechanical properties of NPUA-based dental resins with commercial Bis-GMA based resins.

Main Methods:

• Synthesis of NPUA via the grafting-onto approach.
• Characterization of NPUA monomer properties (viscosity, volumetric shrinkage, cytotoxicity).
• Evaluation of NPUA-based resins and composites for flexural strength, modulus, hardness, hydrophobicity, water absorption, and solubility compared to Bis-GMA/TEGDMA systems.

Main Results:

• NPUA exhibited significantly lower viscosity (158 ± 1 Pa·s) and volumetric shrinkage (2.5% ± 0.1%) than Bis-GMA (1,174 ± 3 Pa·s, 4.7% ± 0.1%).
• NPUA demonstrated reduced cytotoxicity (P < 0.05).
• NPUA-based resins and composites showed superior flexural strength, modulus, and hardness, with lower volumetric shrinkage, water absorption, and solubility compared to Bis-GMA based materials.

Conclusions:

• NPUA is a promising novel resin monomer for dental applications.
• NPUA-based materials offer enhanced physicochemical and mechanical properties, addressing limitations of current dental resins.
• This research provides a new pathway for developing advanced dental restorative materials.