Kareem Abd El Hamid Lotfy, Heba Salah El Din Hamza And Dina Wafik Elkassas,

ABSTRACT
Objective: The Aim Of This In Vitro Study Was To Evaluate The Penetration Efficacy Of A Caries Infiltrant Resin With Different Etching And Application Times.

Materials and Methods: Ninety Sound Human Incisors Were Immersed In A Demineralizing Solution In Order To Create Artificial Subsurface Carious Lesions. Specimens Were Divided Into Three Equal Groups According To Etching Time [30, 60,90 Sec] Then Further Divided Into Three Subgroups According To Application Time [4, 3+1, 2+1 Min]. After Application Of The Infiltrate Resin, Specimens Were Embedded In Transparent Scaffolds And Sectioned. Specimens Were Immersed In A 100�Mj/sodium Fluorescein For 3 Hours. Digital Images Were Obtained Using Light Stereo Microscope At 120x. Results Were Analyzed Using ANOVA Test.

Results: Etching Time Had No Significant Effect On The Depth Of Penetration Of The Resin Infiltrant Material. However Significant Difference Between Different Application Times (P<0.0001) Was Evident. Using 30sec. Etching Time, The Highest Significant Mean Value Was Recorded In 4min Application Time, Whereas The Lowest Significant Mean Value Was Recorded In 2min Application Time. Conclusion: Application Time Is A Crucial Factor That Affects The Penetration Depth Of The Resin Infiltrant Material.