Table 1.

Information of search strategies using MeSH keywords

Database	Search Strategies	Results
PubMed	(((((((((((((((((((((Tooth anatomy)) OR (Tooth Root)) OR (Tooth diagnosis)) OR (Tooth histology)) OR (Root canal morphology)) (Dental anatomy)) OR (Root canal system)) OR (Root canal configuration)) OR (Dental Pulp Cavity)) OR (Dental histology)) OR (Dental diagnostic imaging)) OR (Dental diagnosis)) AND (X-ray methods)) OR (X-ray Microtomography)) OR (micro computed tomography)) OR (Micro-CT)) OR (microcomputed tomography)) AND (mandibular first premolars))	30
Scopus	TITLE-ABS ("Tooth anatomy" OR "Tooth Root" OR "Tooth diagnosis" OR "Tooth histology" OR "Root canal morphology" OR "Root canal configuration" OR "Dental Pulp Cavity" OR "Tooth diagnostic imaging" OR "Dental diagnostic imaging") AND TITLE-ABS ( "X-ray methods" OR "X-ray Microtomography" OR "micro computed tomography" OR "Micro-CT" "microcomputed tomography") AND TITLE-ABS ( "mandibular first premolars")	11
Cochrane	"Tooth anatomy" OR "Tooth Root" OR "Tooth diagnosis" OR "Tooth histology" OR "Root canal morphology""Root canal configuration" OR "Dental Pulp Cavity" OR "Tooth diagnostic imaging" OR "Dental diagnostic imaging" AND "X-ray methods" OR "X-ray Microtomography" OR "micro computed tomography" OR "Micro-CT" OR "microcomputed tomography" AND "mandibular first premolars"	8
ScienceDirect	"Tooth Root" OR"Root canal configuration" OR "Tooth diagnostic imaging" OR "Tooth diagnosis" OR "Dental Pulp Cavity" AND "X-ray Microtomography" OR "microcomputed tomography" OR "Micro-CT" AND "mandibular first premolars"	10
Total		59