title: Long-term gingival conditions after orthodontic closure of extraction sites. Histological and histochemical studies.
mesh_terms: D000293:Adolescent; D003970:Diastema / Q000628:therapy; D005260:Female; D005881:Gingiva / Q000033:anatomy & histology* / Q000201:enzymology; D005882:Gingival Diseases / Q000209:etiology; D006801:Humans; D008297:Male; D009967:Orthodontic Appliances / Q000009:adverse effects; D012690:Serial Extraction; D013997:Time Factors; D014087:Tooth Movement Techniques / Q000009:adverse effects