Current literature has extensively investigated the fit of conventionally fabricated fixed restorations, both at the restoration margin and internal surface. The combination of digital design and machine manufacturing techniques is termed computer-aided design/computer-aided manufacturing (CADCAM). In modern dentistry, the 3D scanning and modeling capabilities allow design work to be done digitally chairside instead of in a traditional laboratory setting. The detailed setting has no improvement in the marginal or internal fit of the restoration, yet it increases milling time. No differences in fit between Planmeca models suggest no effect of spindle number on accuracy. ConclusionsĪll fit parameters were in an acceptable range. Across all models, the average milling time was 7.2 min less in standard mode than in detailed mode. The 30s had significantly higher actual and predicted times compared to all other models. There was no difference between actual and predicted time with the two Planmeca models, but with CEREC, the actual time was significantly higher than the predicted time. No differences were observed between detailed or standard settings in either system. The actual and predicted times of the milling were also registered. The AMD and FULL were measured digitally in mesio-distal and bucco-lingual 2D slices. The cadaver tooth was extracted, and each crown was fixed on it and scanned by a high-resolution microCT scanner. Twenty-four e.max crowns were designed and milled by the Planmill 30s or 40s or CEREC MCXL mills with either detailed or standard settings. Full-arch scans were made by Emerald or Omnicam four times each. One upper molar was prepared for an all-ceramic crown in human cadaver maxilla. Therefore, this study aimed to compare the absolute marginal discrepancy (AMD) and the full internal fit (FULL) of all-ceramic crowns made by two chairside systems, Planmeca FIT and CEREC, with detailed and standard mill settings. Chairside systems are becoming more popular for fabricating full-ceramic single restorations, but there is very little knowledge about the effect of the entire workflow process on restoration fit.
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