Sayed A. Karim, Olfat Elsayed Hassanien And Asmaa Yassen,

ABSTRACT

Objectives: The Aim Of This Study Was To Compared The Micro-leakage Of Indirect Nano-hybrid Resin Composite Inlay Restorations Fabricated Using Flexible Die Versus Stone Die. Methods: A Total Number Of 44 Sound Non-cavitated Freshly Extracted Upper Human Premolar Teeth Were Selected For This Study. Teeth Were Randomly Divided Into Two Main Groups According To The Die Material. Each Group Was Subdivided According To The Storage Period, After 24 Hours And After 3 Months With 11 Teeth In Each. Two Way ANOVA Used To Compare Between Tested Die Materials And The Time Intervals For Mean Microleakage (mm) And Dimensional Changes (%).One-Way ANOVA Used To For Interaction Between Variables Followed By Tukey?s Post Hoc Test For Pairwise Comparison.

Results: Results Which Showed That Die Materials Had A Significant Effect On The Micro-leakage Values In Mm At P-value Equal To 0.007. On The Other Hand Time Intervals Variables Had An Insignificant Effect On The Micro-leakage Values At P-value Equal To 0.189. Conclusion: Dimensional Change Is Not A Challenging Problem For The Flexible Die. The Dimensional Stability Of The Stone And Flexible Die Material Was Not Influenced By The Storage Time.