Background and Objectives: Preeclampsia in pregnant women is a common problem, resulting in high morbidity and mortality. Understanding the initiating etiologic factors is essential to properly design preventive and therapeutic strategies. The purpose of this study was to determine the effect of periodontitis on preeclampsia in 22 Bahman Hospital Gonabad patients Materials and Methods: A case-control study was carried out in 22 Bahman Hospital Gonabad that included 30 pregnant women with preeclampsia and 30 non-preeclamptic women between 20-40 weeks of pregnancy. Sociodemographic data such as age, parity, and education was the same in two groups. Both groups were examined by a dentist for periodontal status. The chi-square tests were carried out to analysis of data by SPSS16 software. Results: The two groups were homogeneous in terms of demographic and obstetric findings. Two groups were significantly different in overall periodontal status [p <0.03], but there were no significant difference between cases and controls in extent of gingivitis, tooth loss, and dental plaque. Conclusion: The result showed that periodontal infection is caused by inflammation is a factor affecting the incidence of preeclampsia, but preeclampsia is not associated with other criteria for review. Need to perform studies with larger sample size is recommended

Keywords: periodontal infection- preeclampsia - pregnancy

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