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Application of Laser Micro-irradiation for Examination of Single and Double Strand Break Repair in Mammalian Cells

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Effect of ionizing radiation on polymer brackets.

A Faltermeier¹, C Reicheneder, P Römer

¹Department of Orthodontics, University of Regensburg Medical School, Franz-Josef-Strauß-Alee 11, 93053, Regensburg, Germany, Andreas.Faltermeier@klinik.uni-regensburg.de.

Journal of Orofacial Orthopedics = Fortschritte Der Kieferorthopadie : Organ/Official Journal Deutsche Gesellschaft Fur Kieferorthopadie

|August 28, 2014

Summary

Electron beam (EB) irradiation improved mechanical properties of some polymer brackets, but caused significant discoloration. This limits the recommendation of industrial-scale EB irradiation for current polymer bracket materials.

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Area of Science:

Materials Science
Polymer Science
Biomaterials Engineering

Background:

Polymer brackets are widely used in orthodontics.
Improving mechanical properties of polymer brackets is crucial for clinical performance.
Electron beam (EB) irradiation is a potential method for material modification.

Purpose of the Study:

To evaluate the effect of EB irradiation on mechanical properties and color stability of polymer brackets.
To determine if mechanical enhancement can be achieved without discoloration.

Main Methods:

Investigated three polymer types (polyoxymethylene, polycarbonate, polyurethane) and five bracket types (commercial and experimental).
Specimens were subjected to EB irradiation (10 MV, 100 kGy).
Assessed fracture toughness, Vickers hardness, wear resistance, and color stability.

Main Results:

EB irradiation increased fracture toughness and Vickers hardness in polycarbonate and polyurethane.
Polyurethane showed reduced post-irradiation wear.
All tested brackets exhibited significant discoloration after EB irradiation.

Conclusions:

EB irradiation can enhance mechanical properties of certain polymer brackets.
Significant discoloration negates the benefits of EB irradiation for current market products.
Industrial-scale EB irradiation is not recommended for existing polymer brackets.