Longevity of dental amalgam in comparison to composite materials.

GMS Health Technol Assess · 2008 · PMC3011298 · PMID 21289917

Europe PMC

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highly significantno p-value reported

The impact of the length of the observation period on the failure rate is highly significant and confirms that short-term studies have a tendency to overestimate the longevity of fillings.

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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.