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BisGMA/TEGDMA dental composite containing high aspect-ratio hydroxyapatite nanofibers
Liang Chen1, Qingsong Yu, Yong Wang
1Department of Mechanical and Aerospace Engineering, University of Missouri-Columbia, Columbia, MO 65211, United States.
Dental Materials : Official Publication of the Academy of Dental Materials
|September 23, 2011
Summary
High aspect-ratio hydroxyapatite (HAP) nanofibers significantly enhance dental resin and composite strength at low concentrations. Proper dispersion is key, as higher HAP nanofiber amounts can degrade mechanical properties.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Nanotechnology
Background:
- Dental composites and resins are widely used restorative materials.
- Improving the mechanical properties of dental materials is crucial for longevity and performance.
- Hydroxyapatite (HAP) is a biocompatible ceramic with potential for reinforcement.
Purpose of the Study:
- To investigate the properties of high aspect-ratio HAP nanofibers.
- To evaluate the reinforcing effect of HAP nanofibers on dental resins and composites.
- To determine the optimal mass fractions for HAP nanofiber incorporation.
Main Methods:
- HAP nanofibers synthesized via a wet-chemical method.
- Characterization using X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermal gravimetric analysis (TGA).
- Biaxial flexural strength (BFS) testing of reinforced dental resins and composites, with statistical analysis using ANOVA.
Main Results:
- Successfully fabricated HAP nanofibers with aspect-ratios of 600-800.
- Low mass fractions (5-10 wt% for resins, 2-3 wt% for composites) substantially improved BFS.
- Observed a percolation threshold for HAP nanofibers; higher concentrations led to bundling and degraded properties.
Conclusions:
- Small mass fractions of well-dispersed HAP nanofibers effectively enhance the mechanical properties of dental resins and composites.
- Dispersion quality is critical for achieving reinforcement.
- HAP nanofibers show promise as a reinforcing filler for dental materials.
