Three-dimensional fit of CAD/CAM-made zirconia copings

A 3-dimensional accuracy analysis of chairside CAD/CAM milling processes

“…38 Modern computeraided techniques can better evaluate the fit of the restoration, because they yield much more extensive and informative data in 3 dimensions. 39 Threedimensional analysis has also proven valid and reliable. 40 In previous studies, the internal and marginal gaps have been examined with 3-dimensional analysis by superimposing scans of the die over scans of the inner surface from the ceramic crown, or by superimposing scans of the die over scans of the fit-checker on the die to measure the thickness of the fitchecker, which replicates the cement space.…”

“…40 In previous studies, the internal and marginal gaps have been examined with 3-dimensional analysis by superimposing scans of the die over scans of the inner surface from the ceramic crown, or by superimposing scans of the die over scans of the fit-checker on the die to measure the thickness of the fitchecker, which replicates the cement space. 24,39 With an accurate intraoral scanning system, the fit of the restoration in the oral cavity depends on the milling process. 18 Thus, this study did not focus directly on the marginal and internal fit but rather on the milling process.…”

Trueness of four different milling procedures used in dental CAD/CAM systems

“…Previous studies have mostly been restricted to analyse the fit of restorations [1,11,[19][20][21][22][23][24]. Marginal fit is one of the most crucial aspects of dental restorations [20] and should be assessed [25].…”

“…Nevertheless, a digital 3D analysis provides comprehensive results over the complete surface, without data loss [20]. For 3D analysis, either a replica or manufactured specimen is scanned on top of the prepared tooth, followed by a scan of the prepared surface using the same coordinate system [20][21][22]32], or the surfaces of the prepared tooth and the manufactured restoration are superimposed by using software [1,24,27,[33][34][35]. Superimposition allows easy comparison between two situations [36].…”

Die spacer thickness reproduction for central incisor crown fabrication with combined computer-aided design and 3D printing technology: An in vitro study

“…The average measured internal gaps obtained ranged from 165.9 to 200.3 μm, which were 3 to 4 times greater than the programmed die spacer thickness. Moldovan et al 24 reported on the internal gap of zirconia copings produced by CAD/Cercon and CAD/Cerec technologies. The programmed die spacer thickness for CAD/Cercon was 10 to 20 μm and CAD/Cerec was -100 μm; the average internal gaps obtained were 100 to 130 μm for CAD/Cercon and 60 to 70 μm for CAD/Cerec.…”