en Rheumatology Rheumatology Original Research Original Research <p><strong>Background: </strong>There are some discrepancy in association between activity of rheumatoid arthritis (RA) and periodontitis. The aim of this study was to evaluate the periodontal status of outpatients with RA.<br> <strong>&nbsp;&nbsp; Methods:</strong> The study was conducted in 2013-14 in a rheumatology clinic in Sari, north of Iran on 74 patients with RA.&nbsp; Evaluation of RA disease activity was according to disease activity score 28 (DAS28). Periodontitis was evaluated by probing depth (PD), gingival index (GI), clinical attachment level (CAL index), plaque index (PI), and panoramic X-ray. Statistical analysis included independent t-test and Mann-Whitney U test for quantitative, and chi square and OR for qualitative variables and evaluation of RA activity and periodontitis severity.<br> <strong>&nbsp;&nbsp; Results: </strong>The mean&plusmn;SD of age and disease duration were 47.01&plusmn;8.1 and 8.93&plusmn;8.6 years, respectively and the mean&plusmn;SD number of teeth was 20.70&plusmn;6.8. Twenty-seven (36.5%) patients had moderate to severe disease. Forty-seven cases (63.5%) were found with periodontitis and 14 (12.2%) were identified to have moderate to severe periodontitis, unrelated to disease activity (p=0.22). For active/inactive periodontitis OR =1.33 (95% CI: 0.46 - 3.87) was computed. There was no association between RA disease activity and number of teeth, CAL, PI, PD, and GI, (p>0.05).<br> <strong>&nbsp;&nbsp; Conclusion:</strong> About 60% of RA patients suffered from periodontitis, but there was not any significant relation between RA disease activity and severity of periodontitis. Periodontitis may interfere with management and follow up of RA, so periodic periodontal examination is suggested in these patients.<br> &nbsp;<br> &nbsp;</p> Rheumatoid arthritis, Periodontal diseases, Disease activity score 252 255 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-1667-3&slc_lang=en&sid=1 Maryam Mobini mmobini50@yahoo.com 200319475328460035733 200319475328460035733 Yes Diabetes Research Center, Mazandaran University of Medical Sciences, Sari, Iran. Avideh Maboudi avideh48188@yahoo.com 200319475328460035734 200319475328460035734 No Dental Faculty, Diabetes Research Center, Mazandaran University of Medical Scienc-es, Sari, Iran. Reza Ali Mohammadpour mohammadpour2002@yahoo.com 200319475328460035735 200319475328460035735 No Diabetes Research Center, Mazandaran University of Medical Sciences, Sari, Iran.