Abstract: Objective　To analyze the association between periodontal status and overweight-obesity in children aged 10 to 11. Methods　198 children aged 10 to 11 of both gender (106 males and 92 females) in Chengdu were included in this case-control study. Subjects answered a questionnaire about their habits of brushing teeth. Anthropometric examinations of height, weight, waist circumference and clinical examination of bleeding on probing (BOP), visible plaque index (VPI), calculus index (CI) and probing depth (PD) were carried out. Body mass index (BMI) was further calculated. Under the BMI standard , 98 and 100 were respectively included in the overweight and obesity group (test group) and normal group (control group), while under the waist circumference standard , 94 and 104 were included in the test group and control group.χ2 test, t test, bivariate and multivariate logistic regression model were used to analyze data. Results Under both standards, the test group showed worse oral hygiene status (P＜0.01), higher BOP, larger population of VPI>0.25 and CI (P＜0.01) than the control group .No statistically significant difference was found between groups regarding PD＞3mm. In multivariate logistic regression analysis, keeping VPI＞0.25 and poor oral hygiene as confounding factors, overweight-obesity under the BMI standard was a risk factor of BOP＞0.25(OR=1.911,95%CI 1.02-3.58), while overweight-obesity under the waist circumference standard was a risk factor of both BOP＞0.25 (OR=1.78,95%CI 1.28-3.39) and occurrence of calculus (OR=1.88, 95%CI 1.03-3.58). Conclusion In children aged 10 to 11, systemic obesity is associated with BOP and abdominal obesity is associated with both BOP and occurrence of calculus.

Key words: Children, Overweight/Obesity, Periodontal status, Body mass index, Waist circumference