Ion release from a composite resin after exposure to different 10% carbamide peroxide bleaching agents.

J Appl Oral Sci · 2012 · PMC3881783 · PMID 22858700

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a strong trendno p-value reported

This shows that so far there is no consensus about whether there are deleterious effects of carbamide peroxide bleaching agents on composite resins but there is a strong trend indicating that they are not harmless.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.