目的 探讨膳食模式与牙周病易感性之间的关系。方法 选取50例新诊断的中重度牙周病患者及50例牙周组织正常者进行膳食频率调查，利用SPSS 19.0软件包的因子分析模块建立膳食模式，并用多因素logistic回归模型分析膳食模式与牙周病的关系。结果 通过因子分析共得到5种不同的膳食模式，分别为粗粮、肉类、果奶、蔬菜坚果和饮料膳食模式。校正混杂因素后发现粗粮膳食模式（OR=0.296，95%CI 0.102~0.860）和蔬菜坚果膳食模式（OR=0.135，95%CI 0.049~0.372）与牙周病的易感性呈负相关，且具有统计学意义。结论 富含粗粮、蔬菜、坚果的膳食模式可能有助于牙周病的预防。

Objective To investigate the correlation between dietary patterns and the susceptibility of periodontal diseases. Methods A total of 50 patients newly diagnosed with moderate to severe periodontal diseases and 50 healthy controls were enrolled for the dietary frequency survey. Dietary patterns were established by the factor analysis module of SPSS 19.0 and the correlation between dietary patterns and periodontal diseases was analyzed by multivariate logistic regression model. Results Five dietary patterns were obtained by the factor analysis, i.e. coarse grain pattern, meat pattern, fruit and milk pattern, vegetable and nut pattern, and beverage pattern. After confounding factors were corrected, the coarse grain pattern (OR=0.296, 95%CI 0.102-0.860) and vegetable and nut pattern (OR=0.135, 95%CI 0.049-0.372) negatively correlated with the susceptibility of periodontal diseases, which was statistically significant. Conclusion Dietary patterns that are rich in coarse grains, vegetables, and nuts may be helpful for the prevention of periodontal diseases.