Basic knowledge of 3D optical measurement methods used for intraoral scanners

Abstract

In recent years, with the spread of new 3D manufacturing technologies such as 3D printing, the demand for 3D coordinate data collection technology has been increasing. In the past, CAD/CAM systems were developed to streamline manual processes such as drafting and clay model making, which were used to describe design shapes as drawings. However, as the number of processes using digital data has increased, such as reverse engineering and computer-aided engineering (CAE), research and development on 3D measurement have been promoted. In this article, the principles and characteristics of typical methods used for 3D measurement in the industry are explained, and the techniques applied in digital impression devices are described and notes are summarized.