Usage History of 'impaction'

The following chart shows how frequently 'impaction' appeared in printed materials over time. For example, the word 'impaction' occurred 140 times in books in 1727 and 13,003 times in 2008. From 1727 to 2008, the word 'impaction' was used a total of 459,442 times in books scanned by Google. See Reference: Google Ngram project.

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