IgG Subclasses in Human Periodontal Disease: III. Serum Concentrations of IgG Subclass Immunoglobulins and Circulating Immune Complexes

Abstract
No quantitative changes in serum IgG subclass concentrations could be correlated clinically with periodontal disease, despite evidence of restrictive IgG subclass antibody responses in inflamed gingiva. Serum from periodontal patients also lacked circulating immune complexes.