What does this research mean for the field?

Tea staining causes clinically unacceptable discoloration in resin composites that is only partially reversed by whitening treatments, which concurrently increase surface roughness, though composites with finer filler structures exhibit greater resistance to these changes. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the color stability and surface roughness of four resin composites after tea-induced discoloration and subsequent whitening using mouthwash or toothpaste.

September 14, 2026

Influence of Tea-Induced Discoloration and Whitening Protocols on the Optical and Surface Properties of Resin Composites: An In Vitro Study.

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Authors

OBOyun-Erdene Batergel DADalndushe Abdulai RSRafat SasanyBiruni University

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Implication

In vitro study demonstrates tea causes severe discoloration across resin composites that whitening only partially reverses, indicating materials with finer fillers retain superior stability.

Key Points

To evaluate the color stability and surface roughness of four resin composites after tea-induced discoloration and subsequent whitening using mouthwash or toothpaste.
Fabricated 80 standardized A1-shade discs from four resin composites (Filtek Z350 XT, Herculite Classic, G-ænial Anterior, and Asteria; n = 20/group) and immersed them in freshly prepared tea for 6 days.
Randomized stained specimens to undergo a 6-day whitening protocol using either Listerine Total Care mouthwash immersion or brushing with a Colgate Optic White toothpaste slurry.
Measured color changes using a spectrophotometer via CIEDE2000 metrics and surface roughness using a profilometer before staining, after staining, and post-whitening.
All composites exhibited clinically unacceptable discoloration after tea exposure (ΔE00 > 1.8), with Herculite Classic and Asteria reaching extremely unacceptable thresholds.
Whitening produced partial color recovery without restoring baseline values, with mouthwash outperforming toothpaste (p < 0.01).
Surface roughness increased across all materials after whitening, with the greatest increase occurring in the toothpaste group (ΔRa = 0.093 ± 0.024 µm).

Cite This Study

Batergel et al. (2026) studied this question.

synapsesocial.com/papers/6aa7b3bf0926e14a848b2d9c https://doi.org/10.3290/j.jad.c_2824

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Implication

In vitro study demonstrates tea causes severe discoloration across resin composites that whitening only partially reverses, indicating materials with finer fillers retain superior stability.

Influence of Tea-Induced Discoloration and Whitening Protocols on the Optical and Surface Properties of Resin Composites: An In Vitro Study.

Discussion

Member takes

Implication

Key Points

Cite This Study

Influence of Tea-Induced Discoloration and Whitening Protocols on the Optical and Surface Properties of Resin Composites: An In Vitro Study.

Discussion

Member takes

Implication

Key Points

Cite This Study

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