Korean J Orthod.  2015 May;45(3):130-135. 10.4041/kjod.2015.45.3.130.

Color stability of laboratory glass-fiber-reinforced plastics for esthetic orthodontic wires

• Inami T
• Tanimoto Y
• Minami N
• Yamaguchi
• Kasai K

• KMID: 1974804
• DOI: http://doi.org/10.4041/kjod.2015.45.3.130

Abstract

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-microm (GFRP-13) or 7-microm glass (GFRP-7) fibers. The color changes of GFRPs after 24 h, and following 1, 2, and 4 weeks of coffee immersion at 37degrees C, were measured by colorimetry. We evaluated the color stability of GFRPs by two evaluating units: the color difference (DeltaE*) and National Bureau of Standards (NBS).
RESULTS
After immersion, both GFRPs showed almost no visible color change. According to the colorimetry measurements, the DeltaE* 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 DeltaE* 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.

Keyword

Esthetics; Wire; Color stability; Fiber-reinforced composite

MeSH Terms

Coffee
Colorimetry
Esthetics
Glass
Immersion
Orthodontic Wires*
Plastics*
Coffee
Plastics

Figure

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  Figure 1 Photograph of esthetic glass-fiber-reinforced plastic (GFRP) orthodontic archwires. Laboratory GFRP archwires and commercially available polycarbonate brackets fixed to the teeth in a dental model.

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  Figure 2 Experimental set-up for color-stability measurement. A, The glass-fiber-reinforced plastic (GFRP) sample devised for colorimetric measurement. This sample was prepared by arranging seven wire segments. Flowable resin was used to fix the wire segments. B, Photograph of the sample and device set-up during measurement. The elastic tip of the instrument was in contact with the middle of the sample.

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  Figure 3 Photograph of the glass-fiber-reinforced plastic (GFRP) wires before and after immersion in the coffee solution for 4 weeks. A, GFRP-13 before immersion. B, GFRP-7 before immersion. C, GFRP-13 after immersion. D, GFRP-7 after immersion. As indicated by the white arrows, the flowable resin that was used to fix the GFRP wires showed discoloration after immersion, while the GFRP wires themselves showed no discoloration.

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