Somayia Ramadan Mohamed, Mohamed Adel Ezzat And Maha Abdel-Salam El-Baz,

ABSTRACT

Objectives: To Evaluate The Effect Of Resin Infiltration, Remineralization Or Their Combination On Microhardness And Surface Roughness Of White Spot Lesion After PH Cycle For 2 Weeks.

Materials and Methods: Thirty Five Sound Extracted Premolar Human Teeth Were Used, The Teeth Were Sectioned Into 2 Halves. Finally 69 Teeth Halves Were Randomly Divided Into 3 Main Equal Groups In Which 23 Specimen In Each One. According To The Treatment Method (A), Where A1 Representing Sealing Using Icon Resin Seal, A2 Representing Remineralization Using Nano-hydroxyapatite Paste (Nano-HAP) And A3 Representing Remineralization Followed By Seal. Each Group Was Divided Into Two Subgroups (B) According To PH Cycle Application Where B1 Represent Immediately After Treatment Without PH Cycle Application And B2 Represent Application Of PH Cycle For 2 Weeks. Surface Micro-hardness Of The Specimens Was Determined Using Digital Display Vickers Micro-hardness Tester. Quantitative Characterization Of Surface Topography Without Contact Was Determined Using USB Digital Microscope With A Built-in Camera. One Way- ANOVA Test Used To Compare Between Treatment Materials. The Significance Level Was Set At P � 0.05. Statistical Analysis Was Performed With IBM? SPSS? (SPSS Inc., IBM Corporation, NY, USA) Statistics Version 22 For Windows.

Results: The Combination Group (Nano-HAP+Icon) Recorded The Highest Values Immediately In Microhardness And The Smoothest Surface Over Other Groups Immediately And After PH Cycling. Conclusion: The Combination Between Nano-HAP Remineralization And Resin Seal Gave Better Results In Surface Roughness And Microhardness Improvement Than Icon Alone Or Nano-HAP Alone But In Case Of Microhardness It Can Not Sustain In Front Of The Acidic Challenge.