An apparatus for digitalization of dental structures which is precise and efficient, generating unequivocal three-dimensional data. A flexible electrical tubing has an end, and loosely carries the at least one electrical conductor therein. The data extraction device extracts data corresponding to a region designated in advance within the image data outputted from the image-capturing element. A portion of the first conductive body is coated with, or volumetrically surrounded by, a material that is nonsolderable and nonconductive.