Basic study of a new denture base resin applying hydrophobic methacrylate monomer

Area of Science:

• Polymer Science
• Materials Science
• Biomaterials

Background:

• Poly(methyl methacrylate) (PMMA) is widely used but suffers from high water sorption.
• This can negatively impact the mechanical properties and longevity of dental restorations.

Purpose of the Study:

• To synthesize and evaluate novel hydrophobic monomers for PMMA modification.
• To reduce water sorption while maintaining or improving mechanical properties.

Main Methods:

• Copolymerization of methyl methacrylate (MMA) with norbonyl methacrylate and phenyl methacrylate.
• Assessment of water sorption, compressive strength, bending strength, elastic modulus, and transverse deflection.
• Dynamic mechanical thermal analysis (DMTA) and polymerization shrinkage measurement.

Main Results:

• Water sorption decreased with increasing concentrations of hydrophobic monomers.
• Copolymers exhibited higher compressive and bending strength than PMMA.
• Elastic modulus remained comparable to PMMA, and transverse deflection met ADA specifications.
• DMTA showed similar thermal behavior to PMMA despite bulky group incorporation.
• Polymerization shrinkage order: norbonyl < phenyl < MMA.

Conclusions:

• Norbonyl and phenyl methacrylate are effective in reducing water sorption of PMMA-based resins.
• These modified resins offer enhanced mechanical properties and meet critical performance standards for dental applications.
• The developed materials present a promising alternative to conventional PMMA for improved dental restorative materials.