The color stability of esthetic brackets

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Suwannee Lappanapornlarp
Nathaphon Tangjit
Kanok-on Tantipanichkul
Phonlakorn Buranaprasertsuk
Supatchai Boonpratham


Objective: To evaluate and compare the discoloration of the esthetic ceramic brackets after stimulating staining in vivid-colored food solutions and coffee.

Methods: 108 ceramic brackets from 4 brands (Inspire IceTM, Radiance PlusTM, ClarityTM, and W&H) were immersed in 4 solutions (Tom-Yum-Goong, yellow curry, green curry or coffee) at 37°C for 3 and 7 days.  Distilled water was used as a solution in the control group.  Color changes (ΔE) were measured by a spectrophotometer for CIE L*, a* and b* system.  Then, the National Bureau of Standards (NBS) value was calculated.  Statistical analysis was done using the Kruskal-Wallis test and the Mann-Whitney U Test (a = 0.05).

Results: Immersed longer, there was a perceptible change of color in all ceramic brackets in Tom-Yum-Goong, yellow curry, and coffee, but no change was noticed in distilled water (ΔE* < 3.7). The color alteration of brackets in green curry was found in ClarityTM and W&H brackets.

Conclusion: Time, various vivid-colored food solutions, and coffee affect changes in the color of esthetic ceramic brackets.  However, the same crystal formation, either monocrystalline or polycrystalline, does not follow the same pattern in color change, varying according to bracket manufacturing fabrication.



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Lappanapornlarp S, Tangjit N, Tantipanichkul K- on, Buranaprasertsuk P, Boonpratham S. The color stability of esthetic brackets. M Dent J [Internet]. 2018 Sep. 20 [cited 2023 Dec. 4];38(3):193-204. Available from:
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