The marginal fit of each restoration was determined by measuring the smallest and largest marginal gaps detected on calibrated macro-photographic images of different surfaces of the restoration using the Image J 1.46 r software. The corresponding restorations were designed and fabricated using the Sirona CEREC® SW 4.0 software, Sirona CEREC® 4.0 MC XL milling machine and 3 M ESPE Lava™ Ultimate Restorative blocks for CEREC®. Methods: Inlay, onlay and crown preparations were scanned using Sirona CEREC® Bluecam and Sirona CEREC® Omnicam with and without powder. Objective: To primarily compare the marginal fit between Bluecam and Omnicam fabricated restorations, and to secondarily assess whether the application of a powder prior to Omnicam impression registration could improve the marginal fit of the restorations. Under the conditions of this study, warm vertical compaction seems to be a less reproducible technique for an inexperienced operator. Conclusion: Micro-CT is a powerful nondestructive ex vivo investigation method that allows qualitative and quantitative examination of root canal fillings. Between vertical compaction and Herofill® (p<0.025), with no statisti-cally significant difference between combined technique and Herofill®.
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