Abstract
BACKGROUND: Fixed orthodontic retainers can promote biofilm accumulation, increasing periodontal risks in patients with type 2 diabetes. This study examines the relationship between glycated hemoglobin (HbA1c) levels and bacterial load before and after oral hygiene intervention. METHODS: Forty diabetic patients (HbA1c: 6.5%-9%) were divided into Group I (18-30 years, n=18) and Group II (>30 years, n=22). Periodontal samples were analyzed using micro-IDent® PCR tests. Pearson's correlation and linear regression assessed associations between HbA1c and bacterial load. RESULTS: Pre-intervention bacterial loads were 66 (Group I) and 128 (Group II). Post-intervention, they decreased significantly to 34 and 93 (p≤0.05). HbA1c showed a strong pre-intervention correlation with bacterial load (r=0.78, p=0.002), decreasing post-intervention (r=0.42, p=0.08). Each 1% HbA1c increase correlated with a 20.3-unit rise pre-intervention (R²=0.61) and 8.2 units post-intervention (R²=0.18). CONCLUSION: Fixed retainers facilitate bacterial colonization, worsening periodontal inflammation in diabetic patients. Glycemic control and regular oral hygiene interventions are essential for reducing bacterial load and preventing complications.