Effect of cavity disinfection with chlorhexidine on microleakage of gingival margin in CIV composite restorations restored with all-in-one adhesive resin in bovine tooth

Abstract

Today the 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 the function of adhesive resins. 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 all-in-one adhesive resin (Clearfil tri S Bond) and Z100 composite (using incremental technique) were used. Following finishing and polishing, the samples were subjected to thermocycling. Then 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. Non-parametric Mann-Whitney U test was used to compare the microleakage of two groups. In this study, P<0.05 was considered significant. Results: There was not any statistically significant difference in microleakage of 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 an all-in-one adhesive resin.