Development of Image-space Telecentric Lens for Intra-Oral 3D Scanner

Abstract

An image-space telecentric lens for an intra-oral 3D scanner was designed and fabricated for dental application. Since a telecentric function can provide the same results regardless of image plane position, it helps to realize a more accurate image for an intra-oral scanner. The performance of the designed lens meets the required properties for HD resolution. In particular, lateral color is corrected within 1 pixel. This system achieves depth of focus of more than 3 mm. For user convenience, the developed system consists of a prism part and an imaging part. Both parts are optimized to reduce the front size and weight of the system. In order to make the parallax sights, parallax angle was determined to be 8 degrees between two optical systems.

Evaluation of the accuracy and precision of four intraoral scanners with 70% reduced inlay and four-unit bridge models of international standard

“…In particular, development of intraoral scanners has changed the paradigm of impression procedures from impression materials and gypsum-based indirect impression techniques to digital dentistry based chair-side impression techniques [3][4][5] . Quick and easy digital impressions offer convenience to both patients and dentists, and are a core technology for dental CAD/CAM systems 6,7) .…”

A Flexible Calibration Approach for Cameras with Double-Sided Telecentric Lenses

“…Double-sided telecentric lenses have been widely used in many machine-vision applications such as noncontact measurement and inspection systems [1][2][3]. The principal scheme of a double-sided telecentric lens is shown in Figure 1.…”