Evaluation of the marginal seal of CEREC 3D restorations using two different luting agents

This in vitro study used two resin cements to evaluate the microleakage of CEREC 3D restorations. An mesio-occluso-distal-lingual (MODL) onlay preparation was placed on an ivorine premolar tooth. Sixty elastomeric impressions of this preparation were used to fabricate resin dies. Imaging propellant was applied to the resin dies. Optical impressions were taken with the CEREC 3 and the CEREC 3D software and used to design and mill 60 onlays. The reliability coefficient was alpha = 0.76 with an examiner agreement rate of 96.4%. Restorations cemented with posterior composite demonstrated a mean microleakage value of 1.46 mm (SD+/- 1.64); by contrast, those restored with dual-cure cement reported a mean microleakage value of 0.21 mm (SD+/-0.57). The difference in microleakage was very highly significant (alpha = 0.001). Posterior composite CEREC 3D restorations cemented with the dual-cure cement showed significantly less microleakage compared to those cemented with posterior composite.