The extracts of clinically inflamed gingiva in fifty‐three patients with chronic periodontitis and in ten patients with clinically normal gingiva were tested for the presence of IgM rheumatoid factor. The identification of rheumatoid factor in such extracts was made using both the latex agglutination macroscopic slide test and the enzyme‐linked immunosorbent assay. Significant correlation was observed between the positive and the negative reactions of the latex slide agglutination test and the enzyme‐linked immunosorbent assay.
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Gargiulo et al. (1985) studied this question.
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