The effect of bleaching on the optical and physical properties of externally stained monolithic zirconia.

Clin Exp Dent Res · 2021 · PMC8543453 · PMID 34155828

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an increasing trendno p-value reported

In our study, there was a significant reduction of surface micro‐hardness with HP 40% ( p = 0.043) but an increasing trend in hardness with 20% CP bleaching.

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