https://www.selleckchem.com/pr....oducts/emd638683.htm
The aim of this study was to systematically review the literature on prevalence of microorganisms and their viability/activity in endodontic periapical lesions. Literature research was performed on five electronic biomedical databases from their start dates to June 2020. Only studies evaluating the presence of microorganisms in periapical lesions in human permanent teeth with secondary/persistent infection were included. Two reviewers independently assessed the eligibility for inclusion, extracted data and evaluated the risk of bias.