title: Space maintainers for the integrity of the arch perimeter: part 1--the transpalatal arch appliance.
mesh_terms: D002648:Child; D006801:Humans; D008437:Maxilla; D008963:Molar; D009967:Orthodontic Appliances; D013027:Space Maintenance, Orthodontic / Q000379:methods*; D014085:Tooth Migration / Q000517:prevention & control