Objectives: This in vitro study was to evaluate the microleakage of cerec 3D restorations with two resin cements. Method: An MOD onlay preparation was performed on an ivorine premolar tooth. 60 elastomeric impressions were made (Reprosil Quixx Putty Dentsply Caulk, Milford, DE) and used to fabricate resin dies (Luxatemp,Hamburg, Germany). Imaging propellant was applied (ProCAD Spray, Ivoclar Vivadent) (IV) and optical impressions were taken (CEREC 3,Sirona USA, Charlotte, NC). Using the Cerec 3D software, 60 onlays were designed and milled (ProCAD Blocks, IV). The dies were cleaned with isopropyl alcohol, etched with IPS ceramic etching gel, (IV) 5% hydrofluoric acid for 1 minute, rinsed and air-dried. Silane coupling agent (Monobond-S, (IV)and bonding agent (Excite Dental adhesive, IV) were applied. Test samples were randomly assigned to two groups. Group A restorations were cemented with a posterior composite (Tetric Ceram, IV) after vibration into place with the ultrasonic Sonicflex handpiece (Kavo). Group B restorations were cemented with dual-cure composite (Variolink II, Vivadent). All samples were light cured for 40 seconds on the proximal and palatal surfaces. Restorations were sealed and soaked in 2% methylene blue solution for 24 hours at room temperature. Each tooth was cut into three sections and examined under a stereomicroscope(X 8) for microleakage. Scores of 0,1, 2, 3, 4 represented mm's of dye penetration. Two calibrated examiners carried out examinations. Independent sample T-tests was used. Results: Reliability coef. alpha was 0.76 with an examiner agreement rate of 96.4%. Mean value for restorations cemented with posterior composite was 1.46 mm (Std. deviation 1.64) as compared to 0.21 mm (Std. deviation 0.57) for dual cure cement. The difference in microleakage was very significant a =0.001. Conclusion:Cerec 3D restorations cemented with the dual cure cement showed significantly less microleakage as compared to posterior composite.

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