Dina Ezz El Din Mohamed , Mohamed Fouad Haridy And Mohsen Hussein Abi Alhasan,

ABSTRACT


Aim: This Study To Assess The Bonding Efficiency Of Resin Composite Using Self Etch Adhesive To Dental Hard Tissues After Remineralization With Conventional Bioactive Glass.

Materials & Methods: Conventional Bioactive Glass Particles Were Prepared. A Total Number Of 25 Extracted Caries-free Human Permanent Molars Used. 5 Specimens As A Positive Control (sound Dentin), The Remaining 20 Specimens Demineralized. The Demineralized Dentin Divided Into: 5 Specimens Negative Control (demineralized Dentin) And The Remaining 15 Specimens Divided Into 3 Groups (5 Each) According To The Period Of Application Of Conventional Bioactive Glass Particles Either One Day, One Week And One Month. After De- And Remineralization Phases, Self-etch Adhesive System Single Bond Universal Adhesive (3M ESPE, St Paul, MN, USA) Was Used According To Manufacturer�s Instructions Before Resin Composite Packing. Three Micro-tubes Were Mounted On The Uncured Adhesive To Restrict The Bonding Area. The Adhesive Coat Was Then Light Cured For 10 Seconds Using A LED Light-curing Unit (Elipar S10, 3M ESPE, St Paul, MN, USA). After Curing Of The Adhesive, The Resin Composite Was Packed In The Micro-cylinders Using Endodontic Plugger. The Packed Resin Composite Light-cured For 40 Seconds Using The Same LED Light Curing Unit. The Specimens Were Stored In Distilled Water For 24 Hours Prior To Micro Shear Bond Strength (�-SBS) Testing. �-SBS Testing Was Done Using A Universal Testing Machine (Lloyd Instruments Ltd., Fareham UK).

Results: The Sound Dentin Showed The Highest �-Shear Bond Strength (MPa) Values (23.7 � 1.54) Followed By The Remineralized Dentin (16.43 � 3.49) With The Lowest �-Shear Bond Strength (MPa) Values For The Demineralized Dentin (11.63 � 1.08). Statistical Significant Differences Existed Among The Three Tested Groups (p?0.001). Conclusion: The Conventional Bioactive Glasses Is A Very Proficient Remineralizing Agent For The Demineralized Dentin. Consequently, The Microshear Bond Strength To Dentin Was Improved After Remineralization. Moreover, Application Time Of The Remineralizing Agent Has A Profound Effect On Its Reminalization Competence.