Development and verification of a novel device for dental intra-oral 3D scanning using chromatic confocal technology
2015
The presented work describes the development and verification of a novel optical, powder-free intra-oral scanner based
on chromatic confocal technology combined with a multifocal approach. The proof of concept for a chromatic confocal
area scanner for intra-oral scanning is given. Several prototype scanners passed a verification process showing an
average accuracy (distance deviation on flat surfaces) of less than 31μm ± 21μm and a reproducibility of less than 4μm ±
3μm. Compared to a tactile measurement on a full jaw model fitted with 4mm ceramic spheres the measured average
distance deviation between the spheres was 49μm ± 12μm for scans of up to 8 teeth (3- unit bridge, single Quadrant) and
104μm ± 82μm for larger scans and full jaws. The average deviation of the measured sphere diameter compared to the
tactile measurement was 27μm ± 14μm. Compared to μCT scans of plaster models equipped with human teeth the
average standard deviation on up to 3 units was less than 55μm ± 49μm whereas the reproducibility of the scans was
better than 22μm ± 10μm.
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