EFFECT OF SILVER DIAMINE FLUORIDE AND SODIUM THIOSULFATE ON DISCOLORATION AND THE DENTIN BOND STRENGTH OF VARIOUS ADHESIVE RESTORATIVE MATERIALS.

Abstract

Objective: The aims of this study to evaluate the effect of sodium thiosulfate with SDF on shear bond strength and Microtensile bond strength for composite and biodentine Activa restorative materials, microhardness of dentin and color stability of dentin surface. Methods: One hundred and twenty-three extracted human permanent molar teeth were used in this study. For Specimens were distributed into eight groups (n=10) for microtensile bond strength (MTBS) and Shear bond strength (SBS) testing. (1) Control: Dentin rinsed with deionized water and restored with Composite restoration. (2) SDF: Dentin treated with 38% SDF and restored with Composite restoration. (3) SDF-KI: Dentin treated with SDF and KI and restored with Composite restoration. (4) Na2S2O3: Dentin treated with SDF and Na2S2O3 and restored with Composite restoration. (5) Control: Dentin rinsed with deionized water and restored with Activa restoration. (6) SDF: Dentin treated with 38% SDF and restored with Activa restoration. (7) SDF-KI: Dentin treated with SDF and KI and restored with Activa restoration. (8) Na2S2O3: Dentin treated with SDF and Na2S2O3 and restored with Activa restoration. MTBS beams were prepared from each specimen after 24 hours and tested with Microtensile tester. Meanwhile, SBS specimens were stored for 24 hours after placement of restorative materials than tested with a universal testing machine (Instron 5566A). In addition, the type of failure was recorded. For micro-hardness test, Specimens were distributed into 3 groups (n=3). (1) SDF: Dentin treated with 38% SDF. (2) SDF-KI: Dentin treated with SDF and KI. (3) Na2S2O3: Dentin treated with SDF and Na2S2O3. The Vickers Hardness Number (VHN) was obtained in three phases for each specimen. (1) Sound dentin: After exposed the dentin surface. (2) demineralized dentin: After immersed the specimens into the demineralized solution for three days. (3) Treated dentin: After one week of application of dentin treatment agent to demineralized dentin surface. For dentin color assessment, Specimens were distributed into 4 groups (n=4). The color of dentin was assessed by using Vita EasyShade and the readings were taken at different time points for each specimen: T0= Pre-treatment; T1= after dentin treatment by one day; T7= after dentin treatment by one week; and T14= after dentin treatment by two weeks. Conclusions: • The microhardness of demineralized dentin improves after the application of SDF, SDF/Na2S2O3, and SDF/KI. Unaccompanied SDF application permitted significantly higher microhardness values than SDF/KI and SDF/Na2S2O3 application. • Application of SDF and SDF/KI negatively impact the bond strength of composite and Activa Biodentine restorative materials to sound dentin. Meanwhile, the application of Na2S2O3 immediately after SDF application improved the bond strength of composite and active restorative materials to sound dentin. • SDF/KI and SDF/Na2S2O3 can significantly reduce the staining effect of SDF on sound dentin.