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KMID : 0361920150450030130
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Korean Journal of Orthodontics
2015 Volume.45 No. 3 p.130 ~ p.135
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Color stability of laboratory glass-fiber-reinforced plastics for esthetic orthodontic wires
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Inami Toshihiro
Tanimoto Yasuhiro
Minami Naomi
Yamaguchi Masaru
Kasai Kazutaka
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Abstract
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Objective: In our previous study, glass-fiber-reinforced plastics (GFRPs) made from polycarbonate and glass fibers were prepared for esthetic orthodontic wires using pultrusion. These laboratory GFRP wires are more transparent than the commercially available nickel-titanium wire; however, an investigation of the color stability of GFRP during orthodontic treatment is needed. Accordingly, in the present study, the color stability of GFRP was assessed using colorimetry.
Methods: Preparation of GFRP esthetic round wires (diameter: 0.45 mm [0.018 inch]) using pultrusion was described previously. Here, to investigate how the diameter of fiber reinforcement affects color stability, GFRPs were prepared by incorporating either 13-μm (GFRP-13) or 7-μm glass (GFRP-7) fibers. The color changes of GFRPs after 24 h, and following 1, 2, and 4 weeks of coffee immersion at 37oC, were measured by colorimetry. We evaluated the color stability of GFRPs by two evaluating units: the color difference (ΔE*) and National Bureau of Standards (NBS).
Results: After immersion, both GFRPs showed almost no visible color change. According to the colorimetry measurements, the ΔE* values of GFRP-13 and GFRP-7 were 0.73?1.16, and 0.62?1.10, respectively. In accordance with NBS units, both GFRPs showed “slight” color changes. As a result, there were no significant differences in the ΔE* values or NBS units for GFRP-13 or GFRP-7. Moreover, for both GFRPs, no significant differences were observed in any of the immersion periods.
Conclusions: Our findings suggest that the GFRPs will maintain high color stability during orthodontic treatment, and are an attractive prospect as esthetic orthodontic wires.
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KEYWORD
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Esthetics, Wire, Color stability, Fiber-reinforced composite
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