Source:http://linkedlifedata.com/resource/umls/id/C0017572
MSH: Exposure of the root surface when the edge of the gum (GINGIVA) moves apically away from the crown of the tooth. This is common with advancing age, vigorous tooth brushing, diseases, or tissue loss of the gingiva, the PERIODONTAL LIGAMENT and the supporting bone (ALVEOLAR PROCESS).,NCI: A loss of gum tissue resulting in an exposure of the roots of the teeth.