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Purpose: The aim of this study was to evaluate the microleakage of 4 fiber post-luting systems using the computerized fluid filtration method., Methods: 60 extracted human mandibular permanent premolar teeth were used for the study. The teeth were instrumented with Hedstroem files up to size 60, post spaces were prepared and then Unicore fiber posts were cemented using 4 luting systems. Group1: Duolink, Group 2: Resinomer, Group 3: Fuji Plus, Group 4: Multilink Sprint, Group 5: Positive Control, and Group 6: Negative Control. The samples were stored in distilled water for 2 weeks and then microleakage was evaluated. Data were analyzed with 1 way-ANOVA and Dunett T3 tests (P<.05). Groups 2 and 3 significantly exhibited higher microleakage values than groups 1 and 4 (P<.05)., Results: Resin cements used with total etch-bonding systems demonstrated lower microleakage values than the other cements., Conclusions: Reduction of steps in dentin conditioning of resin luting cements may have a promoting effect on microleakage.

Purpose: The aim of this study was to compare the efficiency of different final irrigation techniques to remove artificially placed dentinal debris from a simulated internal root resorption (IRR) cavity., Methods: Seventy teeth were prepared using the ProTaper system. The roots were then split longitudinally into two halves, in each of which standardized IRR cavities were prepared. Five teeth were set aside to serve as negative control group. Each cavity of the remaining 65 teeth was filled with dentin debris mixed with 2.5% NaOCl. Another 5 teeth (positive control) were not subjected to the debris removal procedure. Sixty teeth were randomly divided into four experimental groups (n = 15), according to the final irrigation technique used: conventional syringe irrigation (CSI), the Self-Adjusting File (SAF), passive ultrasonic irrigation (PUI), and the EndoActivator (EA). Ten milliliters of 2.5% NaOCl was used during the debris removal procedure. The root halves were disassembled, and the amount of remaining debris was evaluated under a stereomicroscope at 30× magnification., Results: SAF and PUI removed debris significantly better than CSI and EA (P<.05). CSI was the least effective in debris removal (p<0.05)., Conclusions: None of the irrigation techniques used was able to completely remove debris from simulated IRR cavities.