Aya Abd El-Fattah Mohammed, Amira Farid El Zoghby And Ali Essam Abdelnabi,

ABSTRACT
This Study Was Conducted To Evaluate Micro-tensile Bond Strength Of Resin Composite To Superficial Dentin Treated With Gold And Silver Nano Particles In Comparison To Untreated Dentin Surface Either Immediately Or After Aging By Thermocycling.

Materials and Methods: Thirty Six Extracted Sound Human Molars Were Selected Then Randomly Divided Into Two Main Groups (A) According To The Applied Materials. (A1) Was For Resin Composite With Adhesive On Etched Dentin (Control Group); (A2) Was For Resin Composite With Adhesive System And Nano Care Gold On Etched Dentin (Intervention Group). Each Main Group Was Further Sub Divided Into Three Subgroups, (B) According To Number Of Thermo-cycles Performed For Samples Where (B1) Was Not Subjected To Thermocycling, (B2) Was Subjected To 2500 Thermo-cycles And (B3) Was Subjected To 5000 Thermo-cycles. Microtensile Bond Strength Values Were Measured For Each Group.

Results: The Results Of The Current Study Revealed That Dentin Pretreatment With Nano Care Gold Maintained MTBs After 5000 Thermocycles While A Significant Reduction In MTBs Occurred In The Untreated Control Group.

Conclusions: Sustaining Micro-tensile Bond Strength Of Resin Composite To Dentin At High Thermal Fluctuations Could Be Achieved By Preceding The Adhesive Step With Application Of Nano Care Gold To Etched Dentin.