Introduction. The objective of this in-vitro study was to compare the accuracy, defined as trueness and precision, of an intraoral scanner and a cast scanner belonging to the same manufacturer (Dental Wings, Montreal, Canada). Materials and methods. An experimental model consisting of a die with a standard preparation for a porcelain fused to a metal crown was manufactured from a disk of polymethylmethacrylate resin, through CAD/CAM milling. The PMMA model was digitized by using an industrial CT in order to obtain the digital reference model. Afterwards, the resin model was scanned 15 times with each scanner, following manufacturer’s instructions. In order to asses trueness, comparisons were performed with the digital reference model while, for precision, the first scan in the series was compared with the following scans. Results and disscusion. When the trueness of the included scanners was tested, the average deviation for the laboratory scanner was 9.85 μm and 20.85 μm, respectively, for the intraoral scanner. As for precision, the mean recorded deviations were 6.32 μm for the laboratory scanner and 17.18 μm for the intraoral scanner. For both fidelity and trueness, F and T tests demonstrate a statistically significant difference between the scanners. Conclusions. Within the limits of this study, we can state that a significant difference was observed between the accuracy displayed by the scanners tested in this study, mainly generated by the different capturing techniques used by each scanner.Keywords:
- CAD CAM
- subtractive manufacturing.