Mohamed Madian *, Gehan Allam ** And Amr Abd Al Aziz*** ,
ABSTRACT
Introduction: In Recent Years, Significant Developments Have Been Taking Place In Caries Removal And Cavity Preparation Using Laser In Dentistry. As The Concept Of Laser-use For Cavity Preparation Is Being Widely Adopted In Dentistry, It Is Necessary To Determine The Quality Of Restoration Margins And Also To Assess The Strength Of The Bond Created After Laser Preparation. Resin Modified Glass Ionomer Restorations Have Great And Wide Applications In The Pediatric Field. The Purpose Of This In Vitro Study Was To Compare The Microleakage And Shear Bond Strength Of RMGI Restorations In Samples Prepared By Er:YAG Laser Versus The Conventional Method In Primary Teeth.
Materials and Methods: For Microleakage Test, 30 Primary Teeth Were Selected And Randomly Divided Into Two Groups For Cavity Preparation. Cavities In Group One Were Prepared By High Speed Diamond Bur And Cavities In Group Two Were Prepared With Er:YAG Laser And Cavities Were Restored With RMGI. The Teeth Were Thermocycled For 1000 Cycles, Placed In 2% Methylene Blue For 24h, Sectioned In The Buccolingual Direction And The Degree Of Dye Penetration Was Scored And Examined Under Stereomicroscope. In Shear Bond Strength Test, Another 30 Primary Teeth Were Selected And Randomly Divided Into Two Groups; High Speed Diamond Bur Group And Er:YAG Laser Group, In Which Samples Were Prepared In Both Groups Until Flat Dentin Surface Was Reached. RMGI Restorations Were Adhered To The Samples In Cylindrical Shape And Samples Were Thermocycled For 1000 Cycles. The Shear Bond Strength Of Samples Was After That Measured By A Universal Testing Machine And The Results Of The Two Groups Were Analyzed.
Results: There Was No Statistical Difference In Scores Of Either Microleakage Or Shear Bond Strength Between Laser Group And The Conventional Group (P>0.05).
Conclusion: Er:YAG Laser With Its Advantages In Pediatric Dentistry And Excellent Acceptance May Be Suggested As An Alternative Device For Cavity Preparation In Primary Teeth.
