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Composite Containing Calcium Phosphate Particles Functionalized with 10-MDP.

R A A da Silva1, R B Trinca1, H S Vilela1

  • 1School of Dentistry, Department of Biomaterials and Oral Biology, University of São Paulo, São Paulo, Brazil.

Journal of Dental Research
|January 29, 2024
PubMed
Summary
This summary is machine-generated.

Functionalizing dicalcium phosphate dihydrate (DCPD) particles with 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) enhanced composite stability in water. This improved mechanical properties over time but reduced calcium ion release.

Keywords:
degradationfunctionalizationion releasemechanical propertiesresin compositeswater sorption

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Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Polymer Chemistry

Background:

  • 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) is crucial for hydroxyapatite bonding in self-etch adhesives.
  • Dicalcium phosphate dihydrate (DCPD) is a potential filler for dental composites.
  • Improving composite durability and managing ion release are key challenges in dental restorative materials.

Purpose of the Study:

  • To functionalize dicalcium phosphate dihydrate (DCPD) particles with 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP).
  • To evaluate the impact of DCPD functionalization on the mechanical properties and hydrolytic stability of a dental composite.
  • To assess the effect of functionalization on calcium ion (Ca2+) release from the composite.

Main Methods:

  • Formulation of experimental composites with 50 vol% inorganic fillers (functionalized or non-functionalized DCPD and silanated barium glass) in a BisGMA/TEGDMA matrix.
  • Characterization included degree of conversion (DC), water sorption (WS), solubility (SL), biaxial flexural strength (BFS) and modulus (FM) after 24h and 5 months, and 28-day Ca2+ release.
  • Statistical analysis using ANOVA and Tukey's test.

Main Results:

  • DCPD functionalization with 10-MDP did not affect the degree of conversion.
  • Composites with functionalized DCPD exhibited significantly lower water sorption and solubility compared to those with non-functionalized DCPD.
  • While initial mechanical strength was reduced by 10-MDP, composites with functionalized DCPD maintained their mechanical properties after 5 months of water storage. Ca2+ release was significantly reduced in formulations containing 10-MDP.

Conclusions:

  • Functionalization of DCPD with 10-MDP enhances the composite's resistance to hydrolytic degradation and improves long-term mechanical stability.
  • The 10-MDP functionalization effectively reduces water sorption and solubility, contributing to improved durability.
  • Reduced Ca2+ release observed with 10-MDP functionalization is attributed to altered water transit at the particle-matrix interface.