title: Prevention of gingival submergence of fixed unilateral space maintainers.
mesh_terms: D000293:Adolescent; D002648:Child; D005881:Gingiva / Q000033:anatomy & histology*; D006801:Humans; D009967:Orthodontic Appliances / Q000009:adverse effects*; D013027:Space Maintenance, Orthodontic / Q000295:instrumentation* / Q000379:methods