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Table 1 Search strategies for different databases

From: Facial soft tissue changes after nonsurgical rapid maxillary expansion: a systematic review and meta-analysis

Database Search strategy Results
Pubmed ((orthodontics[MeSH Terms]) AND ((maxillary expansion) OR palatal expansion technique[MeSH Terms])) AND (face[Title/Abstract] OR mouth[Title/Abstract] OR lip[Title/Abstract] OR nose[Title/Abstract] OR nasal[Title/Abstract] OR naso*[Title/Abstract] OR alar[Title/Abstract] OR soft tissue*[Title/Abstract]) 668
Embase #1 ‘orthodontics’/exp. #2 ‘palatal expansion technique’/exp. #3 ‘maxillary expansion’ #4 ‘soft tissue’:ab,ti #5 face:ab,ti OR mouth:ab,ti OR lip:ab,ti OR nose:ab,ti OR nasal:ab,ti OR naso*:ab,ti OR alar:ab,ti #6 #2 OR #3 #7 #4 OR #5 #8 #1 AND #6 AND #7 282
Crochrane #1 MeSH descriptor: [Orthodontics] explode all trees #2 MeSH descriptor: [Palatal Expansion Technique] explode all trees #3 face or mouth or lip or nose or nasal or naso* or alar or ‘soft tissue*’:ti,ab,kw (Word variations have been searched) #4 ‘maxillary expansion’ (Word variations have been searched) #5 #2 OR #4 #6 #1 AND #3 AND #5 66
Ovid 1. exp. orthodontics/ 2. exp. palatal expansion technique/ 3. maxillary expansion.af. 4. 2 or 3 5. (face or mouth or lip or nose or nasal or naso* or alar or soft tissue*).af. 6. 1 and 4 and 5 603
MEDLINE Complete (EBSCOhost) AB (face or mouth or lip or nose or nasal or naso* or alar or ‘soft tissue*’) AND AB orthodontic AND AB ((maxillary expansion) OR (palatal expansion)) 154
CINAHL (EBSCOhost) same as MEDLINE Complete 19
SCOPUS (TITLE-ABS-KEY(face OR mouth OR lip OR nose OR nasal OR naso* OR alar OR “soft tissue*”) AND TITLE-ABS-KEY(“maxillary expansion” OR “palatal expansion”) AND TITLE-ABS-KEY(orthodontic)) 702
Sciencedirect TITLE-ABSTR-KEY(face OR mouth OR lip OR nose OR nasal OR naso* OR alar OR “soft tissue*”) and TITLE-ABSTR-KEY((orthodontic AND (“maxillary expansion” OR “palatal expansion”))) 73
In total 2567