Method for obtaining crown region shape using intraoral scanner having tomographic imaging function

Abstract

A method of obtaining crown region shape includes obtaining a three-dimensional surface shape image of an oral structure including a tooth on which tooth deletion has been performed; setting a surface edge of a tooth deletion region as a location of a region of interest; scanning a surface shape and an internal cross-section of the oral structure at a predetermined location of the oral structure, and obtaining a partial surface shape image and a partial internal cross-sectional image of the oral structure; detecting a location of a crown margin corresponding to an edge of a region where a tooth was actually deleted from the partial internal cross-sectional image; merging the location of the crown margin with a surface image of a tooth, and causing a margin of the tooth deletion region obtained from a surface shape image of the tooth to extend to the location of the crown margin.