Related Experiment Video
Updated: Jun 5, 2026
11:44
Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
Published on: March 20, 2015
Electron-beam irradiation of polymer bracket materials
Andreas Faltermeier1, Michael Behr, Claudia Reicheneder
1Department of Orthodontics, University Medical Center of Regensburg, Regensburg, Germany. Andreas.Faltermeier@klinik.uni-regensburg.de
Summary
Electron-beam irradiation enhanced the mechanical properties of polycarbonate and polyurethane dental brackets. However, polyoxymethylene brackets did not show improvement after irradiation.
Area of Science:
- Materials Science
- Polymer Science
- Biomaterials Engineering
Background:
- Electron-beam irradiation is a method to modify polymer properties through cross-linking, increasing molecular mass and forming a 3D network.
- Polymers are widely used in dental bracket materials due to their favorable characteristics.
Purpose of the Study:
- To investigate the impact of electron-beam irradiation on the mechanical properties of common polymer bracket materials.
- To compare the effects of irradiation on polyoxymethylene, polycarbonate, and polyurethane.
Main Methods:
- Three polymer types (polyoxymethylene, polycarbonate, polyurethane) were selected for bracket material analysis.
- Samples were irradiated using a 10 MeV electron accelerator with a 100 kGy dose.
- Mechanical property testing included three-medium wear, fracture toughness, and Vickers hardness, with comparisons to control groups.
Main Results:
- Polycarbonate and polyurethane showed improved fracture toughness and Vickers hardness post-irradiation.
- Polyoxymethylene exhibited decreased fracture toughness after irradiation, though it maintained superior mechanical properties overall.
- Wear test results mirrored the mechanical property trends observed.
Conclusions:
- Electron-beam postcuring effectively enhanced Vickers hardness and fracture toughness in polycarbonate and polyurethane bracket materials.
- Polyoxymethylene, possessing inherently high mechanical properties, did not benefit from electron-beam postcuring.
