Ragi Samy Fahmy , Kareem Maher Mohamed And Wael Mohamed Mobarak Refai,

ABSTRACT
Background: One Of The Most Common Complications That Occur During And After Orthodontic Treatment Is The Formation Of White Spot Caries Lesions. Therefore, Different Attempts Have Been Made To Increase The Caries Resistance Of Enamel Prior To And During Fixe Orthodontic Treatment. Resin Infiltratio Technique Is A New Protocol Used For Treatment Of White Spot Lesions. The Aim Of The Study Is To Investigate The Influenc Of Caries Infiltran Preconditioning On The Shear Bond Strength Of Orthodontic Resin Cements On Sound And Demineralized Enamel. Material& Method: The Study Was Carried On (40) Sound Bovine Enamel Specimens. They Were Randomly Divided Into Two Groups. Group One (control Group): No Surface Pretreatment Was Carried Out. Boding The Brackets With The Traditional Way Was Performed. Group Two: Teeth Were Subjected To Demineralization To Form Artificia Carious Lesions. Then Application Of ICON Before Bonding The Brackets Took Place. After Bonding Of Brackets In Both Groups, All Specimens Underwent A Second Cycle Of Demineralization. Bracket Shear Bond Strength Was Evaluated For Both Groups With A Universal Testing Machine.

Results: There Was A Statistically Significan Difference Between (Control With No Surface Pretreatment) And (Icon Surface Pretreatment) Groups Where (p=0.011). The Highest Mean Value Of Shear Bond Strength Was Found In (Icon Surface Pretreatment) (15.21 ? 3.05), While The Lowest Mean Value Of Shear Bond Strength Was Found In (Control With No Surface Pretreatment) (11.41 ? 2.91). Conclusion: ICON Resin Infiltratio Can Be Used Before Bonding Of Fixe Orthodontic Appliances To Improve Bonding Strength And To Provide A Barrier To Prevent White Spot Lesions To Develop During Orthodontic Treatment With Fixe Appliances.Key Words: ICON, Resin Infiltratio, Orthodontic Treatment, White Spot Lesions, WSLs, Orthodontic Brackets Bond Strength, Shear Bond Strength. Abbreviations: ICON (Infiltratio Concept), WSL (White Spot Lesions)