Hanan M. Abdelaziz, Dina Elkassas And Heba Salah El-dein Hamza,

ABSTRACT
This Research Was Designed To Evaluate The Remineralizing Potential Of Fluoride In Comparison To Three Different Calcium Phosphate Based Remineralizing Agents Using Surface Microhardnesss Test.

Materials & Methods: A Total Of 50 Sound Human Mandibular Molars Were Used In This Study. Artificial Enamel Carious Lesions Were Induced And The Enamel Specimens Were Divided Randomly Into Five Groups, According To The Remineralizing Agent Used; Group A1: Molars Stored In Artificial Saliva, Group A2: Fluoride Varnish Was Used, Group A3: CPP-ACP Varnish, Group A4: F-TCP Varnish And Finally Group A5: Novamin Paste Was Applied. Specimens Were Then Subjected To A PH Cycling Protocol For Eight Consecutive Days. The Surface Micro Hardness (SMH) Was Assessed Using Vickers Microhardness Tester, Prior To Demineralization Of The Specimens As A Baseline (SMH/Baseline), Following Demineralization (SMH/Demineralization) And Finally, After The Remineralization Regimens & PH Cycling (SMH/Remineralization), Then Mean Surface Microhardness Recovery Percentage Was Calculated (SMHR %).

Results: Showed That The Highest SMHR% Was Found In Novamin (58.29 � 8.14) Followed By TCP (50.56 � 6.37), CPP-ACP (46.40 � 13.93) And Fluoride (34.94 � 9.35). While The Lowest SMHR% Was Found In Saliva Group (14.26 � 5.77). Conclusion: Crystalline Calcium Phosphate Based Delivery Vehicles Showed Higher Remineralizing Efficacy Compared To The Amorphous Calcium Phosphate Based And Fluoride Based Agents. Novamin Remineralizing System Confers The Highest Remineralization Tendency With The Highest Potential.