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The latter was followed by a supplementary step with the XP-endo Finisher (XPF) instrument. For irrigation, 5.25% sodium hypochlorite was used. Root canal samples were taken at the baseline (S1), after preparation (S2), and after the supplementary step (S3). DNA was extracted and subjected to high-throughput sequencing using the MiSeq Illumina platform.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Samples from 10 teeth from the RB and 7 from the XPS group were subjected to DNA sequencing. Initial samples differed significantly from post-preparation samples in bacterial diversity, with no significant difference when comparing the two instrument systems. The most dominant phyla in S2 were Bacteroidetes, Proteobacteria, Firmicutes, Fusobacteria, and Actinobacteria. The same phyla were found to dominate baseline samples and samples taken after using XPF, but with differences in the ranking of the most dominant ones. At the genus level, the most dominant genera identified after RB instrumentation were\n                      <jats:italic>Bacteroidaceae<\/jats:italic>\n                      [G-1],\n                      <jats:italic>Fusobacterium<\/jats:italic>\n                      , and\n                      <jats:italic>Staphylococcus<\/jats:italic>\n                      , while the most dominant genera after XPS instrumentation were\n                      <jats:italic>Fusobacterium<\/jats:italic>\n                      and\n                      <jats:italic>Porphyromonas.<\/jats:italic>\n                      These genera were also dominant in the initial samples.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Both treatment protocols had measurable effects on the root canal microbial diversity, with no significant differences between them. Most of the dominant taxa involved in the primary infection and probably in the aetiology of apical periodontitis were eliminated or substantially reduced.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Clinical relevance<\/jats:title>\n                    <jats:p>\n                      The most dominant taxa that persisted after instrumentation were\n                      <jats:italic>Fusobacterium, Porphyromonas<\/jats:italic>\n                      ,\n                      <jats:italic>Staphylococcus<\/jats:italic>\n                      , and\n                      <jats:italic>Bacteroidaceae<\/jats:italic>\n                      [G-1].\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00784-024-05544-2","type":"journal-article","created":{"date-parts":[[2024,2,8]],"date-time":"2024-02-08T13:02:16Z","timestamp":1707397336000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Impact of root canal preparation using two single-file systems on the intra-radicular microbiome of teeth with primary apical periodontitis"],"prefix":"10.1007","volume":"28","author":[{"given":"Rodrigo Rodrigues","family":"Amaral","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert M.","family":"Love","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tiago","family":"Braga","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria I.","family":"Souza C\u00f4rtes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caio T. 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