A method of multi-view intraoral 3D measurement

摘要

In dental restoration, it is important to achieve a high-accuracy digital impression. Most of the existing intraoral measurement systems can only measure the tooth from a single view. Therefore, if we are willing to acquire the whole data of a tooth, the scans of the tooth from multi-direction and the data stitching based on the features of the surface are needed, which increase the measurement duration and influence the measurement accuracy. In this paper, we introduce a fringe-projection based multi-view intraoral measurement system. It can acquire 3D data of the occlusal surface, the buccal surface and the lingual surface of a tooth synchronously, by using a sensor with three mirrors, which aim at the three surfaces respectively and thus expand the measuring area. The constant relationship of the three mirrors is calibrated before measurement and can help stitch the data clouds acquired through different mirrors accurately. Therefore the system can obtain the 3D data of a tooth without the need to measure it from different directions for many times. Experiments proved the availability and reliability of this miniaturized measurement system.