Abstract: Methods and apparatuses (including devices and systems, such as intraoral scanners and software) for analyzing images of a subject's teeth. In some examples these methods may include examining the same teeth or tooth regions across different times and/or different imaging modalities, including but not limited to visible light, infrared, florescent, etc. Also described herein are methods and apparatuses for using a single, master, control for automatically or semi-automatically simultaneously adjusting multiple imaging parameters across multiple images of a region taken with different imaging modalities and/or at different times.

Abstract: Methods and apparatuses that may improve the accuracy of three-dimensional (3D) models may compare one or more geometric properties from corresponding 2D images. The 3D model (e.g., mesh model) and the 2D images may be taken from the same scan, e.g., an intraoral scan, of the subject's dentition. In some examples normals of the 3D mesh model may be compared to a normals map derived from the 2D image(s). Alternatively or additionally, these methods and apparatuses may be configured to compare a depth map generated from a 2D image to improve the 3D digital mesh model.

Abstract: A method comprises registering a current color-image scan to a current three-dimensional scan, registering the earlier color-image scan to an earlier three-dimensional scan, and correlating a current three-dimensional scan and the earlier three-dimensional scan to each other, such that a given area A of the current three-dimensional scan correlates to a corresponding area A? of the earlier three-dimensional scan. Based on the correlation of the current three-dimensional scan and the earlier three-dimensional scan, the registration of the current color-image scan to the current three-dimensional scan, and the registration of the earlier color-image scan to the earlier three-dimensional scan, for the given area A of the current three-dimensional scan, the method applies (i) a portion of the earlier color-image scan registered to corresponding area A? of the earlier three-dimensional scan to (ii) the given area A of the current three-dimensional scan.

Abstract: Methods and apparatuses (including devices and systems, such as intraoral scanners and software) for analyzing images of a subject's teeth. In some examples these methods may include examining the same teeth or tooth regions across different times and/or different imaging modalities, including but not limited to visible light, infrared, florescent, etc. Also described herein are methods and apparatuses for using a single, master, control for automatically or semi-automatically simultaneously adjusting multiple imaging parameters across multiple images of a region taken with different imaging modalities and/or at different times.