Korean J Orthod.  2023 May;53(3):139-149. 10.4041/kjod22.144.

Effect of orthodontic bonding with different surface treatments on color stability and translucency of full cubic stabilized zirconia after coffee thermocycling

• Hemmati YB
• Asli HN
• Nahavandi AM
• Safari N
• Falahchai M

• KMID: 2542809
• DOI: http://doi.org/10.4041/kjod22.144

Abstract

Objective
To assess the color stability and translucency of full cubic stabilized zirconia (FSZ) following orthodontic bonding with different surface treatments and coffee thermocycling (CTC).
Methods
This in vitro study was conducted on 120 disc-shaped specimens of FSZ. Thirty specimens were selected as the control group and remained intact. The remaining specimens were randomly divided into three groups based on the type of surface treatment (n = 30): airborne particle abrasion (APA), silica-coating (CoJet), and carbon dioxide (CO₂) laser. After metal bracket bonding in the test groups, debonding and polishing were performed. Subsequently, all specimens underwent CTC (10,000 cycles). Color parameters, color difference (ΔE₀₀), and translucency parameter (TP) were measured three times at baseline (t0), after debonding and polishing (t1), and after CTC (t2). Data were statistically analyzed (α = 0.05).
Results
Significant difference existed among the groups regarding ΔE₀₀t0t2 (p < 0.001). The APA group showed minimum (ΔE₀₀ = 1.15 ± 0.53) and the control group showed maximum (ΔE₀₀ = 0.19 ± 0.02) color stability, with no significant difference between the laser and CoJet groups (p = 0.511). The four groups were significantly different regarding ΔTPt0t2 (p < 0.001). Maximal increases in TP were noted in the CoJet (1.00 ± 0.18) and APA (1.04 ± 0.38) groups while minimal increase was recorded in the control group (0.1 ± 0.02).
Conclusions
Orthodontic treatment makes zirconia restorations susceptible to discoloration and increased translucency. Nonetheless, the recorded ΔE₀₀ and ΔTP did not exceed the acceptability threshold.

Keyword

Y-TZP ceramic; Brackets; Color; Surface treatment

Figure

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  Figure 1 Scanning electron microscopic micrographs of the zirconia surface after different surface treatments. A, Control. B, Airborne particle abrasion. C, CoJet. D, CO2 laser (×500 magnification).

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  Figure 2 Scanning electron microscopic micrographs of the zirconia surface after polishing (A) airborne particle abrasion; (B) CoJet; (C) CO2 laser (×80 magnification).

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  Figure 3 Schematic view of the experimental process. APA, airborne particle abrasion; t0, baseline; t1, after debonding and polishing; t2, after coffee thermocycling.

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