Rasha N. AlGhandour , Dena S. Mustafa And Khaled A. Nour,

ABSTRACT


Purpose: The Purpose Of This Study Was To Evaluate The Effect Of Three Different Surface Treatments On Surface Microhardness Of Artificial White Spot Lesions At Different Times Of Measurement.

Materials and Methods: A Total Of 65 Anterior Bovine Teeth Were Randomly Assigned To 12 Groups (n=5) According To The Two Experimental Factors Being Investigated (surface Treatment And Time Of Measurement). Labial Enamel Surfaces Were Wet Ground Using SiC Paper Grits # 180, 600, And 1200, Then, Acrylic Base Was Poured. Artificial White Spot Lesions Were Created In The Outlined Window Of Sound Enamel Measuring 6mm?6mm Using Demineralizing Solution. Different Surface Treatments Were Performed According To The Tested Times Of Measurement Which Are Immediately, After 2 Weeks, After 4 Weeks, And After 8 Weeks On Artificial White Spot Lesions Specimens; G1: Artificial Saliva, G2: Resin Infiltrant And G3: CPP-ACP. Representative Specimen From Each Group Was Evaluated Using Environmental Scanning Electron Microscope. Then, Specimens Were Submitted To Vickers Microhardness Test After Surface Treatment. ANOVA Was Used To Analyze The Data.

Results: Two-Way ANOVA Showed A Significant Effect Of Surface Treatment And Time Of Measurement On Surface Microhardness Of Artificial White Spot Lesion. Meanwhile, The Interaction Between Surface Treatment And Time Of Measurement Had No Significant Effect On Surface Microhardnes (p > 0.001). Conclusion: Resin Infiltrant Was More Effective In Improving Surface Microhardness Of Enamel Immediately. Meanwhile, CPP-ACP Seems To Only Impart An Increase In Microhardness After 4 Weeks.