APPENDIX 1.

Ovid MEDLINE(R) In-Process and Other Nonindexed Citations, Ovid MEDLINE(R) Daily, and Ovid MEDLINE(R) 1946 to Present

Search Group	Keyword
1	Orthodontic anchorage procedures/
2	Anchorage.mp.
3	Anchorages.mp
4	2 or 3
5	orthodontics/or orthodont*.mp.
6	4 and 5
7	(transpalatal adj2 (arch or arches or bar or bars)).mp.
8	or/1,6-7
9	6 and 7
10	(retract* or extract*).mp.
11	8 and 10
12	9 or 11
Limits	Humans