Abstract: Objective: To investigate the effect of duraphat to treat hypersensitivity after subgingival scaling. Methods: 80 patients with chronic periodontitis were randomly divided into subgingival debridement(Group A) and subgingival debridement with Duraphat(Group B). Each patient had to have at least two sites with probing depths of >4mm in each quadrant. Compare PD, BOP, CAL changes and the degree of treatment discomfort with VAS values of groups A and B at baseline, 1 month and 3 months after treatment. According to the periodontal probing depth (PD), patients are also randomly divided into two subgroups: subgroup A with PD >4mm and subgroup B with PD more than 6mm. Duraphat and ordinary toothpaste without desensitization ingredients are used separately after scaling. The indexes of VAS were recorded immediately, 1 month and 3 months later to evaluate the degree of tooth sensitivity. Results: Probing pocket depth, clinica attachment level and bleeding index improved both groups, but the patients perceived less pain with Duraphat during therapy. Conclusion: The duraphat has ideal effect in treating chronic periodontitis and can reduce teeth hypersensitivity after subgingival scaling.

Key words: Chronic periodontitis , Subgingival scaling , Duraphat, VAS