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We describe the development and verification of an optical, powder-free, intraoral scanner based on a chromatic confocal imaging system, which has been realized in a single-shot multifocal approach. The system is based on a combination of micro-optical and dispersion optical elements. The methodology of recording and analyzing the acquired data are discussed in detail. A proof of concept with the application in intraoral scanning is provided. According to the current findings, the measurement uncertainty, scan speed, and overall performance of the device can well compete with the state-of-the-art of commercially available intraoral scanners.

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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