Table 1 PubMed search strategy

#1

"dentinal tubules"[Title/Abstract] OR "root canal"[Title/Abstract] OR "root canals"[Title/Abstract] OR "root dentine"[Title/Abstract] OR "dentinal tubule"[Title/Abstract] OR "premolars"[Title/Abstract] OR "tubules"[Title/Abstract] OR "Dentition"[Title/Abstract] OR "dentition, permanent"[MeSH Terms] OR "incisor"[MeSH Terms] OR "bicuspid"[MeSH Terms] OR "cuspid"[MeSH Terms]

119,521

#2

"sonic irrigation"[Title/Abstract] OR "endoactivator"[Title/Abstract] OR "sonication"[Title/Abstract] OR "EDDY"[Title/Abstract] OR "sonic activation"[Title/Abstract] OR "sonication"[MeSH Terms]

19,798

#3

"sealer penetration"[Title/Abstract] OR "depth of penetration"[Title/Abstract] OR "penetration depth"[Title/Abstract] OR "sealer penetration"[Title/Abstract] OR "Sealing"[Title/Abstract] OR "tubule penetration"[Title/Abstract] OR "dentin permeability"[MeSH Terms]

19,622

#4

#1 AND #2 AND #3

33