Effect of Cavity Disinfection with Chlorhexidine on Microleakage of Gingival Margin in Cl-V Composite Restorations Restored with One-step Self-etch Adhesive Resin: an in Vitro Study

Abstract

Background and Objectives: Today application of cavity disinfectants such as chlorhexidine after cavity preparation and before placement of restorative material has gained wide acceptance. However, some researchers believe that these materials interfere with function of adhesive resins. The aim of the present study was to evaluate the effect of chlorhexidine on microleakage of gingival margin of composite class V cavities restored with one-step self-etch (seventh-generation) adhesive resin in bovine tooth in vitro. Materials and Methods: In buccal surfaces of 60 sound bovine permanent incisors, class V cavities were prepared with occlusal margins at the enamel and gingival margins in dentin. The teeth were randomly divided into two groups of 30. In group 1, the samples were restored without chlorhexidine while group 2 specimens were restored using chlorhexidine. In order to restore the teeth, in both groups one-step self-etch adhesive resin (Clearfil tri S Bond) and Z100 composite (using incremental technique) were used. After finishing and polishing, the samples were subjected to thermocycling. Thereafter, they were immersed in 2% basic Fushin solution for 24 hours. Following sectioning, the microleakage of gingival margin of the samples was evaluated under stereomicroscope. Results: There was no statistically significant difference in microleakage between the two groups (P=0.91). Conclusion: The use of chlorhexidine as a cavity disinfectant had no effect on microleakage of gingival margin in composite class V cavities restored with one-step self-etch adhesive resin.