CRP and rheumatoid arthritis: IgG1 and IgG2 against P. gingivalis,PD assessments: probing depth, CAL, BOP, plaque index, and plaque index;clinical RA assessment: DAS28-CRP and DAS 28-ESR, SDAI, HAQ, VAS;laboratory variables: RF, hsCRP, ESR, IgG/IgA ACPAs