RESUMO
Objective: To study the relationship between C-reactive protein (CRP) gene polymorphisms and the risk of chronic peri-odontitis and severe chronic periodontitis (CP) with type2 diabetes to confirm the effect of genetic factor in chronic periodontitis and chronic periodontitis with type2 diabetes. Methods; DNA was extracted by Chelex-100 from buccal swabs of patients who suffered from chronic periodontitis or chronic periodontitis with type2 diabetes and patients with healthy periodontium. PCR-RFLP was used to test the CRP genotype distribution. The correlationship between the incidence of chronic periodontitis and chronic periodontitis with type2 diabetes and CRP gene polymorphism was analyzed statistically. Results; There was no statistical difference in the distribution of CPR +1059 genotype and allele frequency between experiment group and control group (X~2 = 0. 223, P=0.994). The genotype and allele frequency distribution were in line with Hardy-Weinberg equilibrium. Conclusion; There is no correlation between CRP + 1059G/C single nucleotide polymorphisms and the susceptibility of chronic periodontitis as well as chronic periodontitis with type2 diabetes.