Effect of two bleaching methods on the microleakage of resin composite resin restorations

Dentin hypersensitivity is a common condition of transient tooth pain associated with a variety of exogenous stimuli. The clinical cause of dentin hypersensitivity is exposed dentinal tubules as a result of gingival recession and subsequent loss of cementum on root surfaces. Two principal treatment strategies are used; Dentinal tubules can be covered by gingival grafts or dental restorations and desensitization of the nerve tissue can be done within the tubules using potassium nitrate. The Purpose of this study was to compare effect of two desensitizing agent nitrate potassium and sodium fluoride after peridontal surgery. In this clinical trial 12 patients that had peridontal surgery at minimum 3 quadrants, in each there was one sensitive tooth, were selected. The degree of sensitivity measured before using nitrate potassium and sodium fluoride the same as control group. Potassium and sodium fluoride gels used on the quadrants (upper or down. The degree of sensitivity measured after 7 and 14 days. Data analysis was done in SPSS software by Freedman and Willcoxon tests. After 7 and 14 days in the all groups, decrease of sensitivity was statistically significant. But after 14 days, between three groups, there were no statistically significant differences. Even though using of nitrate potassium 3% and sodium fluoride 2% cause significant reduction of tooth sensitivity in a 2 weeks period but in compare to the control group did not show any superiority. Further study is needed to confirm this result.