Heba-T-Allah Mohamed Mohamed Metwally, Inas Mohy El-Din, Shaymaa Mohamed Nagi And Rasha Haridy .,
ABSTRACT
Aim: This Study Was Conducted To Study The Effect Of Curing Mode Of Acetone-based Vs. Solvent-free Self-etch Adhesive Systems On The Resin-dentin Bond Strength At Different Dentin Depth And Time Intervals.
Materials and Methods: A Total Of 120 Recently Extracted Caries-free Human Molars Were Selected. Three Adhesive Systems Were Tested In This Study; [Nano-Bond� Two-step Acetone Based Self-etch Adhesive (NB)], [Nano-Bond� Two-step Acetone Based Self-etch Adhesive + Nano-Bond� Dual Cure Activator (NB+DC)], And [Bond-1 SF Solvent Free One-step SE Adhesive (SF)]. Teeth Were Prepared Either To Expose Superficial Or Deep Dentin. The Prepared Dentin Specimens Received The Adhesive Systems Of Each Subgroup According To The Manufacturer�s Instructions. Resin Composite Was Build Up On Bounded Dentin Substrate. Restored Specimens Were Aged Either For 48h Or Three Months, Then Each Restored Tooth Was Sectioned Into Sticks Of (1 � 0.05) Mm2 Thickness To Be Tested For Microtensile Bond Strength (�TBS) Using Universal Lloyd Testing Machine Travelling At A Cross-head Speed Of 0.5 Mm/minute Until Failure.
Results: Results Revealed That (SF) Group Recorded The Highest Statistically Significant (p<0.05) �TBS Mean Value (23.93� 1.04 MPa) Followed By (NB+DC) Group (22.97� 1.71 MPa), While (NB) Group Recorded The Lowest Statistically Significant (p<0.05) �TBS Mean Value (21.22� 0.43 MPa) As Indicated By Three-way ANOVA Test. There Was Non-significant (p>0.05) Differences Between (SF) And (NB+DC). Moreover; There Was No Significant (p>0.05) Differences Between (NB+DC) And (NB). There Was No Statistical Significant Effect For Either Dentin Depth Or Aging Periods On Resin-dentin Microtensile Bond Strength Of All Tested Adhesive.
Conclusions: Solvent Free Light Cure Dentin Adhesive May Constitute A Promising Adhesive Concerning The �TBS Irrespective Of Either Dentin Depth Or Time Intervals. Adding A Dual Cure Activator To Acetone Base Dentin Adhesive May Had No Obvious Benefits On The Resin-dentin �TBS Regardless Dentin Depth And Time Intervals.
